Search claims · PlantClaims

2020s 954

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Each additional sandstorm hour during the winter wheat growing season corresponded to a 1.4% yield decrease.

Taxon: winter wheatTriticum aestivume0
Treatment: sandstorme0
Outcome: yielde0
Direction: decreasee0
Value: 1.4%e0

Verbatim

e0
“Each additional hour of sandstorm during the winter wheat growing season corresponds to a 1.4% decrease in yield.”
✓ located verbatim in the source · abstract, characters 615–728

Title

Impacts of Sandstorms on Wheat Yield in Northern China

Jue Du; Lingling Hou; Yuanyuan Zhao; et al. American Journal of Agricultural Economics 2025. doi:10.1111/ajae.12532

Other claims from this paper (5)

Association Sandstorms reduced northern China winter wheat yield by 14.8%.
Association Sandstorms significantly decreased planted areas.
Observation Farmers increased fertilizer investments in response to sandstorms.
Observation Farmers increased labor investments in response to sandstorms.
Recommendation Timely irrigation after sandstorms, especially in drier areas, can mitigate adverse effects on wheat production.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Winter wheat yield did not decrease with cover crops.

Taxon: winter wheatTriticum aestivume5
Treatment: with CCe5
Outcome: yielde5
Direction: did not decreasee5

Not reportedComparator

Verbatim

e5
“Cover crops significantly increased vegetable crop yields and decreased the silage corn yield; however, grain corn, soybean, and winter wheat yield did not decrease with CC”
✓ located verbatim in the source · abstract, characters 1013–1185

Title

Do Cover Crops Increase Subsequent Crop Yield in Temperate Climates? A Meta-Analysis

Inderjot Chahal; Laura L. Van Eerd Sustainability 2023. doi:10.3390/su15086517

Other claims from this paper (15)

Intervention effect Legume cover crop species increased subsequent crop yield significantly more than grass, by 14%.
Intervention effect Legume cover crop species increased subsequent crop yield significantly more than nonlegume broadleaves, by 7%.
Intervention effect Legume cover crop species increased subsequent crop yield significantly more than mixtures, by 2%.
Intervention effect Incorporating cover crop residue into soil increased crop yield by about 15% compared with leaving the residue on the soil surface.
Intervention effect Grass cover crops enhanced crop yield by 14% relative to no cover crop in non-organic vegetable systems.
Intervention effect Legume cover crops enhanced crop yield by 19% relative to no cover crop in non-organic vegetable systems.
Intervention effect Legume cover crops increased crop yield by 18% relative to no cover crop in coarse textured soil.
Intervention effect Legume cover crops increased crop yield by 4% relative to no cover crop in medium textured soil.
Intervention effect Legume cover crops increased crop yield by 11% relative to no cover crop under high precipitation.
Intervention effect Cover crops significantly increased vegetable crop yields.
Intervention effect Cover crops decreased silage corn yield.
Intervention effect Grain corn yield did not decrease with cover crops.
Intervention effect Soybean yield did not decrease with cover crops.
Intervention effect Cover crops in no-tillage and plow tillage systems increased crop yield compared with the no-CC control.
Recommendation Crop yield response to cover crops might become more robust when pedo-climatic and agronomic factors are considered.

Intervention effectobservedreview summarynegativeprojected

Claim · model-written summary

Climate change is estimated to decrease wheat yield by 10-14%.

Taxon: wheatTriticum aestivume0
Treatment: CCe0
Outcome: wheat yielde0
Direction: decreasee0
Value: 10-14%e0

Not reportedComparator

Verbatim

e0
“By changing the environmental parameters, it is estimated that CC will lead to a 10-14% decrease in wheat yield.”
✓ located verbatim in the source · abstract, characters 479–591

Title

Effect of Climate Change on Wheat Yield and Water Productivity in Iran and the World

N. Heydari; F. Taran Iranica Journal of Energy and Environment 2024. doi:10.5829/ijee.2025.16.02.08

Other claims from this paper (11)

Intervention effect Climate change has adversely affected wheat yield, especially rain fed wheat in Iran and elsewhere.
Observation Some studies report wheat yield changes greater than the 10-14% estimate.
Mechanism Temperature increase and heat stress are identified as the most important factor in wheat climate impacts.
Intervention effect Climate change can reduce the wheat crop growth period.
Intervention effect Climate change can reduce the planting-to-flowering period.
Intervention effect Climate change can shorten the seed filling period.
Intervention effect Climate change can reduce the flowering-to-maturity and seed production period.
Recommendation Adaptation measures include heat-tolerant, low-water-requirement cultivars, longer-growing cultivars and planting date changes.
Recommendation Adaptation measures include improved on-farm water management, residue management and increased soil organic matter.
Recommendation Wheat adaptation strategies should focus on reducing temperature and heat stress effects, especially at critical growth stages.
Recommendation Climate effects on strategic crops should be mainstreamed and prioritized in national and sub-national research, especially in Iran, to ensure food security.

2010s 907

Show all 907 →

Observationobservedoriginal resultnegativeprojected

Claim · model-written summary

Wheat yield is projected to decrease across locations.

Taxon: wheatTriticum aestivume0
Outcome: wheat yielde0
Direction: decreasee0

Verbatim

e0
“wheat yield would decrease across locations.”
✓ located verbatim in the source · abstract, characters 1247–1291

Title

Effects of a wheat rotation on cotton production in a changing climate: a simulation study

Q Luo; M Bange; P Devoil Climate Research 2016. doi:10.3354/cr01413

Other claims from this paper (6)

Intervention effect For irrigated cotton, three years in and one year out is projected to give the best lint yield.
Intervention effect Cotton yields are projected to decrease under changing climate at most locations across crop sequences.
Intervention effect Wheat yields are projected to decrease more than cotton yields under changing climate.
Intervention effect Rain-fed continuous cotton is projected to perform better at Emerald, Dalby and/or Narrabri with solid and single skip rows.
Intervention effect A cotton-wheat sequence is projected to outperform continuous cotton for lint yields with double skip rows at Emerald, Moree and Narrabri.
Recommendation The authors recommend combining better crop sequences with other adaptation options to maintain production.

Intervention effectobservedoriginal resultnegativenot significant (as stated)measured

Claim · model-written summary

Thiourea tended to decrease straw yield nonsignificantly.

Taxon: wheatTriticum aestivumt0
Treatment: application of TUe0
Outcome: straw yielde0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“While the straw yield showed a decrease trend with the application of TU. Decrease in straw yield, although marginal was statistically insignificant.”
✓ located verbatim in the source · abstract, characters 1068–1217

t0
“Wheat”
✓ located verbatim in the source · title, characters 39–44

Title

Genetic Expression of Yield Ability in Wheat (Triticum aestivum L.) under Sulphydryl Enriched Biophysio-Environment

PC Gupta; Shiv Narayan; PS Shekhawat; et al. INROADS- An International Journal of Jaipur National University 2013. doi:10.5958/j.2277-4912.2.1.004

Other claims from this paper (8)

Observation The four wheat varieties differed significantly in yield and yield attributes.
Association Variety by thiourea dose interaction was nonsignificant.
Observation Thiourea at 5 and 10 kg/ha tended to increase wheat yield components.
Intervention effect Thiourea at 10 kg/ha increased harvest index by 10.11%.
Observation Thiourea at 20 kg/ha raised harvest index only marginally by 4.75.
Intervention effect Thiourea at 10 kg/ha significantly increased grain yield by 8.0%.
Intervention effect Thiourea at 5 kg/ha slightly increased grain yield over control.
Intervention effect Thiourea at 20 kg/ha slightly increased grain yield over control but reduced it versus 10 kg/ha.

Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

The 4M:6S ratio did not decrease subsequent wheat yield.

Taxon: wheatTriticum aestivume0
Outcome: yielde0
Direction: did not decreasee0

Verbatim

e0
“but it did not decrease yield of wheat.”
✓ located verbatim in the source · abstract, characters 1740–1779

Title

Row Ratios of Intercropping Maize and Soybean Can Affect Agronomic Efficiency of the System and Subsequent Wheat

Yitao Zhang; Jian Liu; Jizong Zhang; et al. PLoS ONE 2015. doi:10.1371/journal.pone.0129245

Other claims from this paper (14)

Observation Maize–soybean intercropping was the optimal summer cropping system.
Intervention effect Maize–soybean intercropping improved yield, economy and land utilization relative to maize monoculture.
Intervention effect Maize–soybean intercropping reduced soil nitrate accumulation relative to maize monoculture.
Observation Maize–soybean intercropping improved the residual effect on subsequent wheat.
Observation Intercropping reduced nitrogen fertilizer use per unit area.
Observation Intercropping increased relative maize biomass.
Observation Border-row photosynthetic efficiency and nitrogen utilization were promoted during intercropping.
Observation Intercropping advantage emerged at tasseling after maize nitrogen topdressing.
Intervention effect The 4M:6S row ratio had the largest land equivalent ratio of 1.30.
Intervention effect The 4M:6S row ratio had the greatest crop nitrogen accumulation of 258 kg ha(-1).
Intervention effect The 4M:6S row ratio had the greatest economic benefit of 3,408 USD ha(-1).
Intervention effect The 4M:6S ratio lowered soil nitrate after maize harvest compared with maize monoculture.
Intervention effect The 4M:6S ratio lowered soil nitrate after subsequent wheat harvest compared with maize monoculture.
Recommendation The authors recommended alternating four maize rows with six soybean rows as the optimum ratio, subject to further multiyear confirmation.

2000s 423

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Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Cultivars with the largest yield had the largest yield decrease from waterlogging.

Taxon: wheatTriticum aestivumt0
Material: Cultivars with the largest yielde0
Treatment: waterlogginge0
Outcome: yielde0
Direction: largest decreasee0

Verbatim

t0
“UK wheat cultivars”
✓ located verbatim in the source · title, characters 30–48

e0
“Cultivars with the largest yield suffered the largest decrease due to waterlogging”
✓ located verbatim in the source · abstract, characters 1094–1176

Title

Growth and yield responses of UK wheat cultivars to winter waterlogging

E. DICKIN; S. BENNETT; D. WRIGHT The Journal of Agricultural Science 2008. doi:10.1017/s0021859608008289

Other claims from this paper (10)

Intervention effectobservedoriginal resultnegativesimulated

Claim · model-written summary

For winter wheat, a gradual increase in air temperature resulted in a simulated yield decrease.

Taxon: winter wheatTriticum aestivume0
Treatment: gradual increase in air temperaturee0
Outcome: yielde0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“For winter wheat, a gradual increase in air temperature resulted in a yield decrease”
✓ located verbatim in the source · abstract, characters 751–835

Title

Potential impact of climate change on selected agricultural crops in north‐eastern Austria

Vesselin Alexandrov; Josef Eitzinger; Vesna Cajic; et al. Global Change Biology 2002. doi:10.1046/j.1354-1013.2002.00484.x

Other claims from this paper (9)

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Each one percent higher virus incidence corresponded to a 55 or 72 kg/ha yield decrease.

Taxon: wheatTriticum aestivumt0
Interactor: viruse0pathogen
Outcome: yield decreasee0
Direction: decreasee0
Value: 55 or 72 kg/hae0

Verbatim

e0
“for each 1% increase in virus incidence, there was a yield decrease of 55 or 72 kg/ha.”
✓ located verbatim in the source · abstract, characters 1873–1959

t0
“wheat”
✓ located verbatim in the source · title, characters 79–84

Title

Role of winter-active aphids spreading Barley yellow dwarf virus in decreasing wheat yields in a Mediterranean-type environment

Deborah J. Thackray; Laura T. Ward; Monica L. Thomas-Carroll; et al. Australian Journal of Agricultural Research 2005. doi:10.1071/ar05048

Other claims from this paper (18)

Observation BYDV-RMV and CYDV incidence was mostly low.
Observation Rhopalosiphum padi predominated among aphid vectors.
Intervention effect Insecticide sprays killed or repelled aphid vectors and stopped further virus spread.
Observation Migrant aphids entered wheat throughout winter at both sites.
Observation Peak colonising aphids ranged from 0 to 99 per transect.
Observation BYDV-PAV incidence ranged from 0.1 to 58% of wheat plants.
Observation Wheat yield ranged from 1.9 to 8.6 t/ha.
Observation Aphids arrived earlier at Site A.
Observation Virus spread and associated yield losses were greater at Site A.
Intervention effect Starting insecticide sprays eight weeks after emergence increased virus incidence versus starting at emergence.
Intervention effect Starting sprays eight weeks after emergence increased yield losses versus starting at emergence.
Intervention effect Delaying sprays beyond eight weeks had no additional effect on virus spread.
Mechanism Early yield losses were attributed entirely to infection because aphids remained scarce until 8–10 weeks after emergence.
Association BYDV-PAV incidence explained 81 or 91% of yield gap variation at Site A.
Association Virus incidence explained 88% of seed weight variation.
Association Virus incidence explained 69% of protein content variation.
Association Virus incidence did not explain seed screenings.
Observation Late virus spread at Site B caused no significant yield or quality losses.

1990s 143

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Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

The yield decrease of wheat increased with subsoil Al.

Taxon: wheatTriticum aestivume0
Treatment: subsoil Ale3
Outcome: yield decreasee3
Direction: increasede3

Verbatim

e0
“toxicity on wheat growth were studied”
✓ located verbatim in the source · abstract, characters 112–149

e3
“the yield decrease increased with subsoil Al”
✓ located verbatim in the source · abstract, characters 935–979

Title

Interacting effects of topsoil water and nitrogen supply on subsoil aluminium toxicity

S. J. Can; G. S. P. Ritchie Communications in Soil Science and Plant Analysis 1994. doi:10.1080/00103629409369268

Other claims from this paper (5)

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Chlorsulfuron did not decrease mature grain nutrient concentrations or grain yield.

Taxon: wheatTriticum aestivumt0
Treatment: Chlorsulfuron treatmente0
Outcome: nutrient concentrations in mature grain or grain yielde0
Direction: did not decreasee0

Not reportedComparator

Verbatim

e0
“Chlorsulfuron treatment did not decrease nutrient concentrations in mature grain or grain yield”
✓ located verbatim in the source · abstract, characters 639–734

t0
“wheat”
✓ located verbatim in the source · title, characters 70–75

Title

The impact of chlorsulfuron and diclofop-methyl on nutrient uptake by wheat.

LD Osborne; AD Robson; DG Bowran Australian Journal of Agricultural Research 1993. doi:10.1071/ar9931757

Other claims from this paper (11)

Intervention effect Chlorsulfuron decreased wheat shoot and root weights and root length in glasshouse experiments.
Intervention effect Chlorsulfuron decreased phosphorus uptake, particularly with low phosphorus supply.
Intervention effect Chlorsulfuron decreased potassium uptake.
Intervention effect Nitrogen, calcium and magnesium uptake was unaffected.
Intervention effect Field chlorsulfuron reduced shoot element concentrations during early growth by up to 30%.
Observation The reduction in shoot element concentrations faded as wheat aged.
Association Kulin was more sensitive to chlorsulfuron than Reeves.
Intervention effect Diclofop-methyl had little effect on shoot nutrient concentrations.
Intervention effect Diclofop-methyl reduced zinc and copper concentrations during vegetative growth.
Intervention effect Diclofop-methyl reduced copper concentration in mature Kulin grain.
Intervention effect Herbicides reduced uptake of diffusion-moved nutrients more than mass-flow nutrients.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Further raising CO2 from 2600 to 10000 micromoles mol-1 produced a smaller further decrease in those yield traits.

Taxon: wheatTriticum aestivumt0
Treatment: 10000 micromoles mol-1e0
Outcome: decreasee0
Direction: decreasee0
Comparator: 2600e0

Verbatim

e0
“Further elevation of [CO2] from 2600 to 10000 micromoles mol-1 caused a further but smaller decrease”
✓ located verbatim in the source · abstract, characters 1079–1179

t0
“Wheat”
✓ located verbatim in the source · title, characters 67–72

Title

Very High CO2Reduces Photosynthesis, Dark Respiration and Yield in Wheat

J REUVENI Annals of Botany 1997. doi:10.1006/anbo.1997.0489

Other claims from this paper (16)

Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased wheat seed yield by 33%.
Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased vegetative biomass by 25%.
Intervention effect Raising CO2 from 350 to 1000 micromoles mol-1 increased heads per square meter by 34%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased seed yield by 37%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased harvest index by 14%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased mass per seed by 9%.
Intervention effect Increasing CO2 from 1000 to 10000 micromoles mol-1 decreased seeds per head by 29%.
Intervention effect Very high CO2 had negligible, nonsignificant effects on vegetative biomass, heads per square meter, and seed mass per head.
Intervention effect Seed yield, harvest index and seeds per head sharply decreased between 1000 and 2600 micromoles mol-1 CO2.
Observation The two wheat cultivars responded similarly to CO2 across growth parameters.
Observation Wheat grown in the two cultivation environments did not differ in response to high CO2.
Association High CO2 was not correlated with ethylene production by wheat flag leaves or heads.
Intervention effect Whole-plant photosynthetic rate was 8% lower at 2600 micromoles mol-1 CO2 than at ambient CO2.
Intervention effect Wheat head dark respiration was 25% lower at 2600 micromoles mol-1 CO2 than at ambient CO2.
Mechanism The authors attribute reduced seed set mainly to reduced dark respiration in wheat heads.
Mechanism The authors conclude that ethylene does not mediate reduced wheat seed set.

1980s 86

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Method / resourceobservedoriginal resultmeasured

Claim · model-written summary

Goodness of fit of relative yield decrease with mean CWSI was r 2 = 0.78 for the combined plantings.

Taxon: Spring WheatTriticum aestivumt0
Outcome: relative Y decrease with mean CWSIe5
Value: r 2 = 0.78e5

Verbatim

t0
“Spring Wheat”
✓ located verbatim in the source · title, characters 43–55

e5
“for relative Y decrease with mean CWSI, r 2 = 0.78”
✓ located verbatim in the source · abstract, characters 1417–1467

Title

Evapotranspiration and Yield Estimation of Spring Wheat from Canopy Temperature¹

R. A. Diaz; A. D. Matthias; R. J. Hanks Agronomy Journal 1983. doi:10.2134/agronj1983.00021962007500050018x

Other claims from this paper (8)

Method / resource Goodness of fit of ET versus the temperature-stress-day index was large (r 2 at least 0.93).
Method / resource Goodness of fit of ET versus the stress-degree-day index was large (r 2 at least 0.86).
Method / resource Large r 2 values were obtained for yield versus the temperature-stress-day and stress-degree-day indices.
Method / resource For combined data from all plantings, r 2 for ET versus the stress-degree-day index was 0.90.
Method / resource For combined data from all plantings, r 2 for yield versus the temperature-stress-day index was 0.21.
Observation Slopes and intercepts of the individual regression lines were significantly different.
Method / resource Goodness of fit of relative ET deficit with mean CWSI was r 2 = 0.86 for the combined plantings.
Recommendation The authors recommend the stress-degree-day index as most suitable for wheat yield assessment and water management in northern Utah.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Plants damaged in the fall showed a marked decrease in grain yield at spring harvest.

Taxon: wheatTriticum aestivume0
Treatment: Plants damaged in the falle5
Outcome: grain yield at spring harveste5
Direction: decreasee5

Not reportedComparator

Verbatim

e0
“hard red winter wheat”
✓ located verbatim in the source · abstract, characters 196–217

e5
“Plants damaged in the fall appeared to recover, but ultimately exhibited a marked decrease in grain yield at spring harvest”
✓ located verbatim in the source · abstract, characters 631–754

Title

Seasonal Damage by Greenbugs (Homoptera: Aphididae) to a Resistant and a Susceptible Variety of Wheat1

Robert L. Burton; Duane D. Simon; Kenneth J. Starks; et al. Journal of Economic Entomology 1985. doi:10.1093/jee/78.2.395

Other claims from this paper (6)

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Nitrogen up to 125 lbs. per acre produced neither a wheat yield increase nor decrease in McPherson County under dry conditions.

Taxon: WheatTriticum aestivume0
Treatment: nitrogen rates up to 125e0
Outcome: yielde0
Direction: Neither a yield increase of a yield decreasee0
Setting: McPherson Co.e0

Not reportedComparator

Verbatim

e0
“Wheat in McPherson Co. and corn in Day Co. received nitrogen rates up to 125 and 150 lbs. per acre. Neither a yield increase of a yield decrease was measure at either location.”
✓ located verbatim in the source · abstract, characters 297–473

Title

Did the Fertilizer or Drought Burn it Up

James R. Gerwing Open PRAIRIE (South Dakota State University) 1988

Other claims from this paper (3)

1970s 54

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Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

The decrease in growth ultimately caused a decrease in wheat yield.

Taxon: WheatTriticum aestivumt0
Outcome: yielde5
Qualifier: This decrease in growthe5

Verbatim

t0
“Wheat Germplasm”
✓ located verbatim in the source · title, characters 14–29

e5
“This decrease in growth ultimately caused a decrease in yield”
✓ located verbatim in the source · abstract, characters 674–735

Title

Evaluation of Wheat Germplasm Against Salinity

Farida Begum; M Saifuzzaman; W Sultana Bangladesh Journal of Scientific and Industrial Research 1970. doi:10.3329/bjsir.v43i2.966

Other claims from this paper (4)

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing simazino rates tended to decrease wheat yield.

Taxon: WheatTriticum aestivumt0
Treatment: Increasing rates of simazinoe1
Outcome: wheat yieldse0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“it tended to decrease wheat yields”
✓ located verbatim in the source · abstract, characters 255–289

e1
“Increasing rates of simazino”
✓ located verbatim in the source · abstract, characters 180–208

t0
“Maize - Wheat Rotation”
✓ located verbatim in the source · title, characters 25–47

Title

Chemical Weed Control in Maize - Wheat Rotation in Semi Arid Tropics

SINGH H.G; SAROHA M.S; SHAKTAWAT M.S Madras Agricultural Journal 1977. doi:10.29321/maj.10.a03155

Other claims from this paper (7)

Recommendation At most 100 per cent replenishment of nitrogen removed by weeds was needed to reduce competition.
Intervention effect Increasing simazino rates significantly increased maize yield.
Recommendation Half a kilogram of pre-emergence simazine was judged the best option without harmful wheat residual effects.
Recommendation Pre- and post-emergence 2,4-D at 0.5 kg/ha with full weed nitrogen replenishment was the most beneficial treatment.
Intervention effect Simazine at half a kg/ha increased maize yield by 4.2 g/ha.
Intervention effect Simazine at half a kg/ha reduced weed dry matter production by 13.2 g/ha.
Intervention effect Simazine at half a kg/ha had no harmful effect on wheat.

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Yield did not decrease significantly until more than 60 cm of plot area was removed.

Taxon: spring wheatTriticum aestivumt0
Treatment: more than 60 cm (12.5%) of plot area was removede0
Outcome: yield of the genotypese0
Direction: decreasee0
Value: 60 cm (12.5%)e0

Not reportedComparator

Verbatim

e0
“Generally, no significant decrease in yield of the genotypes was detected until more than 60 cm (12.5%) of plot area was removed.”
✓ located verbatim in the source · abstract, characters 415–544

t0
“spring wheat”
✓ located after whitespace/quote normalisation · title, characters 38–50

Title

Yield Adjustment for Missing Units in Spring Wheat¹

Robert H. Busch; Yusuf Ergun Crop Science 1973. doi:10.2135/cropsci1973.0011183x001300010044x

Other claims from this paper (3)

Association Mean yield reduction per missing unit was about 4.55%.
Association Yield reduction per missing unit ranged from 3.7 to 5.0% across genotypes and years.
Method / resource Yield adjustments using the mean reduction were satisfactory after more than two missing units.

1950s 17

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Observationobservedoriginal resultno effectmeasured

Claim · model-written summary

Slightly damaged wheat fields had no actual yield decrease.

Taxon: wheatTriticum aestivumt0
Outcome: yielde0
Direction: not founde0
Setting: slightly damaged fielde0

Verbatim

e0
“Actual decrease in yield was not found in the slightly damaged field”
✓ located verbatim in the source · abstract, characters 1794–1862

t0
“wheat plants”
✓ located verbatim in the source · title, characters 23–35

Title

On the frost damage of wheat plants occured at Tokorozawa district, Saitama prefecture in 1955

Y. OKAMOTO; Y. KANZAKI; H. INOUE; et al. Journal of Agricultural Meteorology 1956. doi:10.2480/agrmet.12.13

Other claims from this paper (16)

Observation Frost killed young ears in low winter type wheat and induced late tiller ears and delayed heading.
Observation Frost caused 68.3% dead stems in the severely damaged field.
Observation Frost caused 48.1% dead stems in the intermediately damaged field.
Observation Frost caused 23.3% dead stems in the lightly damaged field.
Association Damage differences were likely related to growth and developmental stage.
Observation Damage changed late stem number, stem length and stem diameter.
Observation Damage delayed wheat heading.
Association Frost damage degree correlated strongly with changed morphological characters and those characters correlated with each other.
Observation Frost decreased complete grains and their proportion.
Observation Frost increased incomplete grain quantity.
Observation Frost decreased thousand grain weight.
Observation Intermediate damage reduced wheat yield by about 30%.
Observation Severe damage reduced wheat yield by about 70%.
Mechanism Late stems produced grains that compensated for yield losses to differing degrees.
Method / resource Late stem productivity may estimate frost related wheat yield loss.
Association Late stem productivity correlated significantly with delayed heading days, stem length and stem diameter.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

May fertilizer failed to decrease take-all.

Taxon: winter wheatTriticum aestivumt0
Treatment: Fertilizer applied in Maye0
Outcome: take‐alle0
Direction: failed to decreasee0

Not reportedComparator

Verbatim

e0
“Fertilizer applied in May increased weed growth, failed to decrease take‐all”
✓ located verbatim in the source · abstract, characters 1358–1434

t0
“WINTER WHEAT”
✓ located verbatim in the source · title, characters 94–106

Title

EFFECT OF NITROGENOUS FERTILIZER APPLIED AT DIFFERENT DATES ON TAKE‐ALL, EYESPOT AND YIELD OF WINTER WHEAT GROWN ON LIGHT SANDY LOAM

G. A. SALT Annals of Applied Biology 1959. doi:10.1111/j.1744-7348.1959.tb02537.x

Other claims from this paper (16)

Intervention effect Fertilized Cappelle yielded 50 cwt per acre versus 19 unfertilized.
Intervention effect Fertilized Holdfast yielded 41 cwt per acre versus 20 unfertilized.
Observation Repeated cropping reduced mean yield from 27 to 15 and 10 cwt per acre.
Observation Ear number decreased from 16.7 to 14.6 and 12.2.
Observation Weight of grain per ear decreased strikingly.
Observation Small grain proportion increased.
Observation Eyespot was present every year but did not become prevalent.
Observation Take-all affected straw rose from 9 to 15 and 26 percent.
Observation Weed infestation increased severely.
Intervention effect April Nitro-Chalk yielded the most grain each year.
Intervention effect April fertilizer reduced eyespot relative to March.
Intervention effect April fertilizer reduced take-all relative to March.
Intervention effect May fertilizer increased weed growth.
Intervention effect May fertilizer yielded fewer ears than earlier applications.
Intervention effect May fertilizer yielded less grain than earlier applications.
Intervention effect May fertilizer yielded a higher tailcorn proportion than earlier applications.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Intermediate damage reduced wheat yield by about 30%.

Taxon: wheatTriticum aestivumt0
Outcome: yielde0
Direction: decreasee0
Value: about 30%e0
Setting: intermediately sufferede0

Verbatim

e0
“decrease of about 30% and 70% in yield was found in the intermediately suffered and severely suffered field respectively.”
✓ located verbatim in the source · abstract, characters 1868–1989

t0
“wheat plants”
✓ located verbatim in the source · title, characters 23–35

Title

On the frost damage of wheat plants occured at Tokorozawa district, Saitama prefecture in 1955

Y. OKAMOTO; Y. KANZAKI; H. INOUE; et al. Journal of Agricultural Meteorology 1956. doi:10.2480/agrmet.12.13

Other claims from this paper (16)

Observation Frost killed young ears in low winter type wheat and induced late tiller ears and delayed heading.
Observation Frost caused 68.3% dead stems in the severely damaged field.
Observation Frost caused 48.1% dead stems in the intermediately damaged field.
Observation Frost caused 23.3% dead stems in the lightly damaged field.
Association Damage differences were likely related to growth and developmental stage.
Observation Damage changed late stem number, stem length and stem diameter.
Observation Damage delayed wheat heading.
Association Frost damage degree correlated strongly with changed morphological characters and those characters correlated with each other.
Observation Frost decreased complete grains and their proportion.
Observation Frost increased incomplete grain quantity.
Observation Frost decreased thousand grain weight.
Observation Slightly damaged wheat fields had no actual yield decrease.
Observation Severe damage reduced wheat yield by about 70%.
Mechanism Late stems produced grains that compensated for yield losses to differing degrees.
Method / resource Late stem productivity may estimate frost related wheat yield loss.
Association Late stem productivity correlated significantly with delayed heading days, stem length and stem diameter.

1960s 14

Show all 14 →

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

The higher protein was accompanied by lower grain yield.

Taxon: SPRING WHEATTriticum aestivumt0
Treatment: simazinee1
Outcome: yield of graine0
Direction: decreasee0

Verbatim

e0
“this increase was accompanied by a corresponding decrease in yield of grain”
✓ located verbatim in the source · abstract, characters 495–570

t0
“SPRING WHEAT”
✓ located verbatim in the source · title, characters 40–52

e1
“The simazine treatments significantly affected both yield and percent protein”
✓ located verbatim in the source · abstract, characters 211–288

Title

EFFECTS OF DILUTE SPRAYS OF SIMAZINE ON SPRING WHEAT

F. H. McNeal; J. M. Hodgson; M. A. Berg Canadian Journal of Plant Science 1969. doi:10.4141/cjps69-027

Other claims from this paper (7)

Intervention effect Simazine treatments significantly affected wheat yield.
Intervention effect Simazine treatments significantly affected wheat percent protein.
Association Wheat yield fell as simazine rate rose.
Association Wheat yield fell when plants were more mature at simazine treatment.
Intervention effect May 16 simazine treatment raised grain protein about 2% above control.
Intervention effect June 16 simazine treatment raised grain protein about 2% above control.
Association Grain protein correlated with grain-to-straw ratio at r = 0.77.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Yield decline was mainly attributable to heads per square metre.

Taxon: wheat cropTriticum aestivumt0
Outcome: decreasee0
Qualifier: differences in the number of heads per sq metree0

Verbatim

e0
“The decrease was due mainly to differences in the number of heads per sq metre”
✓ located verbatim in the source · abstract, characters 964–1042

t0
“wheat crop”
✓ located verbatim in the source · title, characters 98–108

Title

An analysis of the effects of nitrogen deficiency on the growth and yield of a Western Australian wheat crop

NJ Halse; EAN Greenwood; P Lapins; et al. Australian Journal of Agricultural Research 1969. doi:10.1071/ar9690987

Other claims from this paper (15)

Observation Relative growth rate generally declined over time.
Intervention effect Early-season relative growth rate ranked N2 above N1 and N0.
Observation Deficient plants recovered rapidly in August.
Association Recovery was associated with second tiller emergence, greater net assimilation and nitrogen uptake, and lower nitrogen stress.
Mechanism There was no evidence that greater soil nitrogen mineralization caused recovery.
Observation Nitrogen stress under N0 fell from 48% in July to 14% in September.
Observation Stress under N1 rose from 6 to 23% in July before falling to 5% in September.
Intervention effect N0 delayed flower initiation 14 days compared with N1.
Intervention effect N0 delayed ear emergence 8 days relative to N1.
Intervention effect N0 grain yield was 30% of N2 grain yield.
Intervention effect N1 grain yield was 60% of N2 grain yield.
Intervention effect Nitrogen deficiency reduced grains per head.
Intervention effect Nitrogen deficiency reduced weight per grain.
Intervention effect Nitrogen treatments did not affect duration of photosynthetic activity after anthesis.
Intervention effect Harvest index was highest under N0 and similar under N1 and N2.

Intervention effectobservedoriginal resultmeasured

Claim · model-written summary

Inadequate phosphorus decreased middlings content.

Taxon: wheatTriticum aestivume0
Treatment: inadequately supplied with phosphoruse0
Outcome: middlings contente0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“When wheat is inadequately supplied with phosphorus a sharp rise in gluten yield and decrease in middlings content occurs”
✓ located verbatim in the source · abstract, characters 1032–1153

Title

EFFECT OF PLANT NUTRITION ON THE AMINO-ACID COMPOSITION OF WHEAT PROTEINS

Poltavskaya, I. A. Defense Technical Information Center (DTIC) 1965

Other claims from this paper (12)

Intervention effect Nitrate nutrition increased wheat tryptophan and tyrosine content.
Intervention effect Ammonia nutrition yielded higher wheat cystine content.
Observation The amino acid difference occurred in vegetative and reserve proteins.
Mechanism Nitrate nutrition increased grain tryptophan and tyrosine through a rise in middlings yield.
Observation Middlings contain more of these proteins than gluten proteins.
Intervention effect Nitrogen top dressing at earing sharply increased gluten yield.
Intervention effect Nitrogen top dressing decreased percentage amino acid content.
Observation Absolute amino acid percentage in gluten did not fall because gluten yield was high.
Intervention effect Inadequate phosphorus increased wheat gluten yield.
Intervention effect Phosphorus deficiency reduced tryptophan content in gluten protein.
Intervention effect Phosphorus deficiency reduced total tryptophan content in wheat grain.
Recommendation The authors concluded normal phosphorus nutrition is important for wheat tryptophan synthesis.

1930s 3

Show all 3 →

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Each additional inch of rain caused a greater average wheat yield decrease in 1854–77 than across 1854–1918.

Taxon: wheatTriticum aestivumt0
Treatment: manured solely in the autumne0
Outcome: yielde0
Direction: greatere0
Comparator: 1854–1918e0
Setting: Rothamsted Experimental Station, Harpendent0

Verbatim

e0
“In the years 1854–77, when plots were manured solely in the autumn, the average decrease in yield caused by each additional inch of rain is greater than the average decrease from 1854–1918”
✓ located verbatim in the source · abstract, characters 167–355

t0
“wheat at Rothamsted Experimental Station, Harpenden”
✓ located verbatim in the source · title, characters 69–120

Title

A comparison of the effect of rainfall on spring- and autumn-dressed wheat at Rothamsted Experimental Station, Harpenden (With Five Text-figures.)

“Alumnus” The Journal of Agricultural Science 1932. doi:10.1017/s0021859600053120

Other claims from this paper (1)

Association Summer rainfall was more detrimental to autumn-dressed than spring-dressed wheat plots.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The yield decrease from sulphate of ammonia is ascribed to more lodging and a greater incidence of foot rot.

Taxon: wheatTriticum aestivume1
Outcome: reduction in yielde2
Qualifier: more lodging and greater incidence ofe4

Verbatim

e1
“study the effect of the time of application of sulphate of ammonia to autumn-sown wheat”
✓ located verbatim in the source · abstract, characters 74–161

e2
“in those three cases sulphate of ammonia decreased yield, irrespective of time of application; the reduction in yield was of the order of 10 per cent”
✓ located verbatim in the source · abstract, characters 269–418

e4
“is ascribed to more lodging and greater incidence of”
✓ located verbatim in the source · abstract, characters 424–476

Title

Investigations in crop husbandry. III. Effect of time of application of sulphate of ammonia to wheat

F. H. Garner; H. G. Sanders The Journal of Agricultural Science 1936. doi:10.1017/s0021859600022012

Other claims from this paper (4)

Intervention effect Sulphate of ammonia decreased wheat yield by about 10 per cent in three experiments on light gravelly soil, irrespective of application time.
Intervention effect Sulphate of ammonia increased wheat yield by 18, 20 and 7 per cent in three experiments on heavy clay soil.
Intervention effect Early dressings of sulphate of ammonia did not affect wheat germination or plant establishment.
Intervention effect Early dressings of sulphate of ammonia tended to increase wheat tiller formation by the end of February.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Tuscan wheat depressed the yield characters of the lines it was blended with, compared with those lines grown alone.

Taxon: wheatTriticum aestivumt0
Material: Tuscane0
Treatment: with which it was blendede4
Outcome: yield characters of the linese4
Direction: decreaseinferrede4
Comparator: when grown by themselvese5

Verbatim

t0
“New Zealand wheat”
✓ located verbatim in the source · title, characters 35–52

e0
“a blend of Tuscan wheat with a high quality line”
✓ located verbatim in the source · abstract, characters 35–83

e4
“Tuscan demonstrated its aggressiveness by depressing in every case the yield characters of the lines with which it was blended”
✓ located verbatim in the source · abstract, characters 855–981

e5
“The yield characters of the components of blends were compared with their yield characters when grown by themselves”
✓ located verbatim in the source · abstract, characters 513–628

Title

Analytical yield investigations on New Zealand wheat: IV. Blending varieties of wheat

O. H. Frankel The Journal of Agricultural Science 1939. doi:10.1017/s0021859600051777

Other claims from this paper (4)

Intervention effect Nine of the eleven blends with Tuscan wheat yielded as expected from the pure varieties.
Intervention effect Two blends with Tuscan wheat yielded more than the expectation from the pure varieties, a non-significant increase.
Association Component varieties of blends modified each other's yield characters, differently in each of three trials.
Intervention effect Yields per plot of the three-line blends corresponded to the expectation.

unknown 1

Show all 1 →

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

N120-180 fertilizer sometimes decreased winter wheat yield under drought during grain swelling and formation.

Taxon: winter wheatTriticum aestivumt0
Treatment: N120-180e1
Outcome: yielde0
Direction: decreasee0
Qualifier: drought conditions during grain swelling and formatione0

Not reportedComparator

Verbatim

e0
“it can even cause the yield decrease in drought conditions during grain swelling and formation”
✓ located verbatim in the source · abstract, characters 770–864

e1
“the increase of applied nitrogen share up to N120-180 as part of complete fertilizer”
✓ located verbatim in the source · abstract, characters 576–660

t0
“winter wheat yield after sunflower”
✓ located verbatim in the source · title, characters 31–65

Title

Effect of mineral nutrition on winter wheat yield after sunflower in Ukrainian steppe zone

M.M. Solodushko; I.I. Gasanova; O.O. Pedash; et al. CyberLeninK (CyberLeninka)

Other claims from this paper (7)

Intervention effect Pre-sowing N90P60K60 increased winter wheat yield by 2.29 t/ha against no fertilizer.
Recommendation The authors consider pre-sowing N60P60K60 relevant under optimal weather with later nitrogen fertilization.
Intervention effect Increasing applied nitrogen to N120-180 did not significantly increase winter wheat yield relative to other variants.
Intervention effect No pre-sowing fertilizer significantly reduced winter wheat yield against better variants.
Intervention effect Pre-sowing N16P16K16 significantly reduced winter wheat yield against better variants.
Intervention effect Pre-sowing N30P60K60 significantly reduced winter wheat yield against better variants.
Observation In most cases spring-summer nitrogen fertilization could not compensate winter wheat yield reduction from no or low pre-sowing fertilizer.

“yield decrease”

Claim types

Direction of the findings

Over time

Claim type

Research area

Polarity

Statistics

2020s 954

2010s 907

2000s 423

1990s 143

1980s 86

1970s 54

1950s 17

1960s 14

1930s 3

unknown 1