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“yield decrease”

1,236 matches

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plus 252 non-evaluative

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1950 ’60 ’70 ’80 ’90 2000 ’10 ’20

plus 31 earlier · 1910s–1940s

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Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Low and high copper significantly decreased biomass and grain yield relative to 0.065 mg L‐1.

Taxon: RiceOryza sativat0
Treatment: low and high Cu supplye0
Outcome: biomass and grain yielde1
Direction: decreasee0
Comparator: 0.065 mg L‐1e1

Verbatim

e0
“compared to this, the decrease in both parameters was significant at low and high Cu supply.”
✓ located verbatim in the source · abstract, characters 413–505

e1
“The biomass and grain yield were highest at 0.065 mg L‐1”
✓ located verbatim in the source · abstract, characters 352–408

t0
“Rice”
✓ located after whitespace/quote normalisation · title, characters 39–43

Title

Copper stress affects grain filling in rice

N. Nautiyal; C. Chatterjee; C.P. Sharma Communications in Soil Science and Plant Analysis 1999. doi:10.1080/00103629909370314

Other claims from this paper (8)

Observation Acute copper deficiency caused chlorosis, necrosis and withered young leaves.
Observation Biomass and grain yield peaked at 0.065 mg L‐1 copper.
Association Grain copper concentration increased from 0.4 ppm in deficiency to 47.4 ppm in excess.
Intervention effect Low and excess copper decreased leaf sugar concentration and two oxidase activities.
Intervention effect Low and high copper retarded grain formation.
Intervention effect Low and high copper decreased grain starch, sugar and protein concentrations.
Intervention effect Low and high copper decreased seed amylase, invertase and starch phosphorylase activities.
Observation Young-leaf copper thresholds were 3.9, 6.8, 32 and 48 μg Cu g‐1dry weight for deficiency through toxicity.

Associationobservedoriginal resultpositivesignificant (as stated)measured

Claim · model-written summary

Yield increase with year of release correlated with decreased leaf area index.

Taxon: soybeanGlycine maxt0
Material: cultivarst0
Outcome: increase in seed yielde0
Direction: increasee0
Qualifier: decrease in leaf area indexe0

Verbatim

e0
“The increase in seed yield with year of release was significantly correlated with an increase in harvest index, photosynthesis, and stomatal conductance and a decrease in leaf area index”
✓ located verbatim in the source · abstract, characters 1078–1264

t0
“Soybean Cultivars”
✓ located verbatim in the source · title, characters 75–92

Title

Physiological Changes from 58 Years of Genetic Improvement of Short‐Season Soybean Cultivars in Canada

Malcolm J. Morrison; Harvey D. Voldeng; Elroy R. Cober Agronomy Journal 1999. doi:10.2134/agronj1999.914685x

Other claims from this paper (10)

Association Maturity time was unaffected by cultivar release year.
Association Total plant dry weight was unaffected by cultivar release year.
Association Seed yield increased by 0.5% per year of cultivar release.
Association Harvest index increased by 0.5% per year of cultivar release.
Association Photosynthetic rate increased by 0.5% per year of cultivar release.
Association Leaf area index decreased by 0.4% per year of cultivar release.
Association Yield increase with year of release correlated with increased harvest index.
Association Yield increase with year of release correlated with increased photosynthesis.
Association Yield increase with year of release correlated with increased stomatal conductance.
Observation Modern cultivars allocate carbon to seeds more efficiently than predecessors.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Defoliation decreased pod number in B. campestris and B. juncea.

Taxon: B. campestris and B. junceaBrassica junceaBrassica rapa subsp. oleiferae0
Treatment: defoliatione0
Outcome: number of pods per plante0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“In B. campestris and B. juncea , a decrease in seed yield by defoliation was associated with a decrease in the number of pods per plant as seed number per pod and thousand‐seed weight were not significantly affected by this treatment.”
✓ located verbatim in the source · abstract, characters 167–401

Title

Contribution of Leaf Photosynthesis towards Seed Yield in Brassica species

S. Ramana; M. C. Ghildiyal Journal of Agronomy and Crop Science 1997. doi:10.1111/j.1439-037x.1997.tb00488.x

Other claims from this paper (9)

Intervention effect Defoliation decreased seed yield in B. campestris.
Intervention effect Defoliation decreased seed yield in B. juncea.
Intervention effect Defoliation did not significantly affect seed number per pod or thousand seed weight in B. campestris and B. juncea.
Intervention effect Defoliation decreased pod number in B. nigra.
Intervention effect Defoliation significantly decreased thousand seed weight in B. nigra.
Intervention effect Defoliation decreased pod number in B. carinata.
Intervention effect Defoliation significantly decreased seed number per pod and thousand seed weight in B. carinata.
Mechanism Leaf photosynthesis mainly contributed to pod formation in B. campestris and B. juncea.
Mechanism Leaf photosynthesis also contributed to seed development in B. nigra and B. carinata.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Higher inoculum reduced chlorophyll content and photosynthetic rate.

Treatment: increase in inoculum levele0 e1
Outcome: total chlorophyll content, photosynthetic ratee0 e1
Direction: decreasee0 e1

Not reportedTaxonComparator

Verbatim

e0
“With the increase in inoculum level there was corresponding decrease in fresh and dry plant weight, total alkaloid yield, total chlorophyll content, photosynthetic rate”
✓ located verbatim in the source · abstract, characters 374–542

e1
“With the increase in inoculum level there was corresponding decrease in fresh and dry plant weight”
✓ located verbatim in the source · abstract, characters 374–472

Title

THE INFLUENCE OF MELOIDOGYNE INCOGNITA ON GROWTH, PHYSIOLOGY, NUTRIENT CONCENTRATION AND ALKALOID YIELD OF HYOSCY AMUS NIGER

Akhtar Haseeb; N. K. Srivastava; Renu Pandey Nematologia mediterranea 1990

Other claims from this paper (7)

Intervention effect Higher inoculum reduced fresh and dry plant weight.
Intervention effect Higher inoculum reduced total alkaloid yield.
Intervention effect Higher inoculum reduced root and shoot iron, manganese, copper and zinc concentrations.
Intervention effect Higher inoculum reduced root sodium and potassium.
Intervention effect Higher inoculum increased shoot sodium and potassium.
Intervention effect Highest inoculum caused the greatest percentage reductions in measured traits.
Observation Nematode reproduction rate peaked at an initial population of 50 second stage juveniles.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing plant density reduced oil and protein yields per hectare.

Taxon: cottonGossypium hirsutumt0
Treatment: plant densitye0
Outcome: oil and protein yields/hae0
Direction: decreasee0

Not reportedComparator

Verbatim

t0
“cottonseed yield and quality”
✓ located verbatim in the source · title, characters 77–105

e0
“As plant density increased, there was a decrease in cottonseed yield/ha, seed index, seed protein content, oil and protein yields/ha”
✓ located verbatim in the source · abstract, characters 209–341

Title

Effect of plant population densities and application of growth retardants on cottonseed yield and quality

Zakaria M. Sawan; Ahmad E. Basyony; Willis L. McCuistion; et al. Journal of the American Oil Chemists Society 1993. doi:10.1007/bf02545314

Other claims from this paper (19)

Intervention effect Increasing plant density reduced cottonseed yield per hectare.
Intervention effect Increasing plant density reduced seed index and protein content.
Intervention effect Increasing plant density reduced oil refractive index, iodine value and unsaponifiable matter.
Intervention effect Increasing plant density reduced unsaturated fatty acids.
Intervention effect Increasing plant density raised oil acid and saponification values.
Intervention effect Increasing plant density raised saturated fatty acids.
Intervention effect Cycocel increased cottonseed yield and seed index.
Intervention effect Alar increased cottonseed yield and seed index.
Intervention effect Cycocel increased seed protein content and oil and protein yield.
Intervention effect Alar increased seed protein content and oil and protein yield.
Intervention effect Cycocel increased oil refractive index, iodine value and unsaponifiable matter.
Intervention effect Alar increased oil refractive index, iodine value and unsaponifiable matter.
Intervention effect Cycocel increased unsaturated fatty acids and reduced oil acid and saponification values.
Intervention effect Alar increased unsaturated fatty acids.
Intervention effect Oil acid and saponification values decreased with growth retardant application.
Association Cottonseed yield did not differ among application rates of either chemical.
Intervention effect Cycocel at 750 ppm produced the highest oil and protein yield per hectare, followed by Alar at 250 ppm.
Intervention effect Cycocel at 250 ppm gave the highest refractive index and unsaponifiable matter and the lowest acid value.
Intervention effect Alar at 250 ppm gave the highest iodine value and lowest saponification value.

Mechanismauthor interpretationoriginal resultbasis n/a

Claim · model-written summary

The authors attribute the polyphenol decrease to water-deficit-related enzymatic activity rather than fruit ripening.

Taxon: oliveOlea europaeat0
Outcome: content of polyphenolic substancese1
Qualifier: different enzymatic activity, caused by the water deficite0

Verbatim

e0
“This decrease could be attributed to different enzymatic activity, caused by the water deficit, rather than to different degrees of fruit ripening”
✓ located verbatim in the source · abstract, characters 1544–1690

e1
“decrease in the content of polyphenolic substances with irrigation”
✓ located verbatim in the source · abstract, characters 1476–1542

t0
“olive (Olea europaeaL.)”
✓ located verbatim in the source · title, characters 73–96

Title

Yield and oil quality of intensively trained trees of three cultivars of olive (Olea europaeaL.) under different irrigation regimes

M. Patumi; R. D’Andria; G. Fontanazza; et al. The Journal of Horticultural Science and Biotechnology 1999. doi:10.1080/14620316.1999.11511180

Other claims from this paper (12)

Observation T3 soil water stayed near field capacity and did not differ from T2.
Observation Soil moisture decreased during summer under T0 and T1, reaching 20.8% in T0 on 12 August before rainfall restored field capacity.
Intervention effect Irrigated olive leaves had higher relative water content than rain-fed controls.
Intervention effect Irrigation increased yield in all olive cultivars compared with rain-fed controls.
Intervention effect T1 increased Nocellara del Belice olive yield by 200% versus rain-fed control.
Intervention effect T2 increased Ascolana tenera olive yield by 233% versus control.
Intervention effect T2 increased Kalamata olive yield by 47% versus control.
Intervention effect Irrigated olives had higher oil yield, mainly because fruit yield increased.
Observation Pulp-stone ratio and fruit triglyceride quantity were similar across irrigation treatments.
Intervention effect Irrigation did not affect olive oil fatty acid composition.
Intervention effect Irrigation decreased olive oil polyphenolic substance content.
Association The polyphenol decrease did not affect organoleptic oil quality or shelf-life.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Elevated CO2 slightly decreased quantum yield efficiency early in development.

Taxon: tomato plantsSolanum lycopersicumt0
Treatment: elevated CO2e1
Outcome: quantum yield efficiencye0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“a slight decrease in quantum yield efficiency as measured by fluorescence (DF/F 9 m )”
✓ located verbatim in the source · abstract, characters 721–806

e1
“During early development (three weeks after planting), the net photosynthetic rate of the leaves was much higher under elevated CO2”
✓ located verbatim in the source · abstract, characters 573–704

t0
“tomato plants”
✓ located verbatim in the source · title, characters 12–25

Title

Response of tomato plants to saline water as affected by carbon dioxide supplementation. II. Physiological responses

J.-H. Li; J. Gale; A. Novoplansky; et al. The Journal of Horticultural Science and Biotechnology 1999. doi:10.1080/14620316.1999.11511101

Other claims from this paper (8)

Intervention effect Elevated CO2 raised leaf net photosynthesis early in tomato development.
Observation No acclimation signs were apparent early under high CO2.
Intervention effect At ten weeks, elevated CO2 suppressed net photosynthesis, photosynthetic capacity, and carboxylation efficiency in non-salinized tomato leaves.
Intervention effect High CO2 reduced Rubisco activity and PSII quantum yield.
Intervention effect High CO2 increased leaf soluble sugar accumulation.
Intervention effect At the highest salinity, the reduction of photosynthetic capacity under high CO2 was smaller.
Association The smaller photosynthetic capacity reduction correlated with increased PSII quantum yield parameters.
Association Rubisco activity responded to CO2 treatments only, without the salinity correlation.

Associationobservedoriginal resultno effectmeasured

Claim · model-written summary

Canola seed yield did not decline as Delia damage prevalence rose in cages.

Taxon: canolaBrassica napus var. napuse0
Interactor: D . radicumDelia radicume0pest
Outcome: seed yielde0
Direction: did not decreasee0

Verbatim

e0
“the seed yield of canola did not decrease with increasing proportions of plants damaged by D . radicum .”
✓ located verbatim in the source · abstract, characters 777–881

t0
“ROOT MAGGOT DAMAGE TO CANOLA AND THE DISTRIBUTION OF DELIA SPP. (DIPTERA: ANTHOMYIIDAE) IN MANITOBA”
✓ located verbatim in the source · title, characters 0–99

Title

ROOT MAGGOT DAMAGE TO CANOLA AND THE DISTRIBUTION OF DELIA SPP. (DIPTERA: ANTHOMYIIDAE) IN MANITOBA

W.J. Turnock; B. Timlick; B.E. Galka; et al. The Canadian Entomologist 1992. doi:10.4039/ent12449-1

Other claims from this paper (11)

Observation Delia radicum was the only Delia species found attacking undamaged canola roots.
Observation Overwintering adults infested canola.
Observation The first-generation adults left maturing canola after one generation.
Observation Root maggot damage occurred across all agricultural regions of Manitoba.
Association Damaged-root percentage was higher in northern regions at 15.8% than southern regions at 8.0%.
Observation Most canola root damage was light.
Association Damage did not visibly affect canola growth or vigour.
Association Foot rot fungi were not associated with root maggot feeding damage.
Association June–July temperature and precipitation described canola root maggot damage in a polynomial.
Association Commercial-field Delia damage in 1985–1988 did not appear to reduce canola yield.
Association Root maggot damage increased with June–July precipitation and temperature.

Intervention effectobservedoriginal resultnegativesimulated

Claim · model-written summary

At a temperature change of -2°C, modeled total Japanese rice yield decreased about -14%.

Taxon: RiceOryza sativat0
Treatment: -2e0
Outcome: total yield of Japane0
Direction: decreasee0
Value: -14e0
Setting: Japane0

Not reportedComparator

Verbatim

e0
“In cases of the temperature change in -2, +2 and 4°C, decrease of the total yield of Japan was estimated to be about -14, -5 and -12%, respectively.”
✓ located verbatim in the source · abstract, characters 274–422

t0
“Rice”
✓ located verbatim in the source · title, characters 12–16

Title

Estimate of Rice Yield of Japan under the Conditions with Elevated CO2 and Increased Temperature by using Third Mesh Climate Data.

Sei-ichiro YONEMURA; Masaharu YAJIMA; Hidemitsu SAKAI; et al. Journal of Agricultural Meteorology 1998. doi:10.2480/agrmet.54.235

Other claims from this paper (7)

Intervention effect At a temperature change of +2°C, modeled total Japanese rice yield decreased about -5%.
Intervention effect At a temperature change of 4°C, modeled total Japanese rice yield decreased about -12%.
Intervention effect With a 2°C temperature increase, modeled rice yield rose only in Hokkaido.
Intervention effect Modeled rice yield declined with warming in central and southern Japan.
Intervention effect Advancing planting date could avoid warming related rice yield reduction in central and southern Japan.
Intervention effect Increasing CO2 from 350ppm to 1200ppm raised modeled rice yield by 10 to 15%, depending on radiation intensity.
Association The modeled CO2 yield benefit was higher under lower radiation intensity.

Intervention effectobservedoriginal resultnegativesimulated

Claim · model-written summary

At a temperature change of +2°C, modeled total Japanese rice yield decreased about -5%.

Taxon: RiceOryza sativat0
Treatment: +2e0
Outcome: total yield of Japane0
Direction: decreasee0
Value: -5e0
Setting: Japane0

Not reportedComparator

Verbatim

e0
“In cases of the temperature change in -2, +2 and 4°C, decrease of the total yield of Japan was estimated to be about -14, -5 and -12%, respectively.”
✓ located verbatim in the source · abstract, characters 274–422

t0
“Rice”
✓ located verbatim in the source · title, characters 12–16

Title

Estimate of Rice Yield of Japan under the Conditions with Elevated CO2 and Increased Temperature by using Third Mesh Climate Data.

Sei-ichiro YONEMURA; Masaharu YAJIMA; Hidemitsu SAKAI; et al. Journal of Agricultural Meteorology 1998. doi:10.2480/agrmet.54.235

Other claims from this paper (7)

Intervention effect At a temperature change of -2°C, modeled total Japanese rice yield decreased about -14%.
Intervention effect At a temperature change of 4°C, modeled total Japanese rice yield decreased about -12%.
Intervention effect With a 2°C temperature increase, modeled rice yield rose only in Hokkaido.
Intervention effect Modeled rice yield declined with warming in central and southern Japan.
Intervention effect Advancing planting date could avoid warming related rice yield reduction in central and southern Japan.
Intervention effect Increasing CO2 from 350ppm to 1200ppm raised modeled rice yield by 10 to 15%, depending on radiation intensity.
Association The modeled CO2 yield benefit was higher under lower radiation intensity.

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“yield decrease”

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