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“yield decrease”

119 matches

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plus 23 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 resultnegativemeasured

Claim · model-written summary

Nitrogen fertilization tended to decrease alfalfa stand persistence.

Taxon: AlfalfaMedicago sativat0
Treatment: Nitrogen fertilizatione0
Outcome: standse0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“Nitrogen fertilization tended to decrease yields and stands”
✓ located verbatim in the source · abstract, characters 239–298

t0
“Alfalfa”
✓ located verbatim in the source · title, characters 92–99

Title

The Effect of Different Fertility Levels on Yield, Persistence, and Chemical Composition of Alfalfa¹

John L. Gerwig; Gilbert H. Ahlgren Agronomy Journal 1958. doi:10.2134/agronj1958.00021962005000060001x

Other claims from this paper (4)

Intervention effect Potash was the most important factor maintaining high alfalfa yield and stand persistence.
Observation The critical potassium percentage varied between seasons.
Intervention effect Nitrogen fertilization tended to decrease alfalfa yields.
Intervention effect Phosphorus had no significant beneficial effect on alfalfa.

Intervention effectobservedoriginal resultnegativesignificant (as stated)measured

Claim · model-written summary

Omitting potassium significantly decreased potato yield in 1952.

Taxon: PotatoesSolanum tuberosumt0
Treatment: elimination of potassiume0
Outcome: yielde0
Direction: decreasee0
Qualifier: In 1952e0

Not reportedComparator

Verbatim

e0
“In 1952 the elimination of potassium did cause a significant decrease in yield.”
✓ located verbatim in the source · abstract, characters 928–1007

t0
“Potatoes”
✓ located verbatim in the source · title, characters 37–45

Title

Utilization of Residual Fertility by Potatoes

R. A. Struchtemeyer; C. E. Cunningham; P. N. Carpenter Soil Science Society of America Journal 1955. doi:10.2136/sssaj1955.03615995001900020026x

Other claims from this paper (3)

Intervention effect Omitting phosphorus from fertilizer significantly decreased potato yields.
Intervention effect Omitting potassium did not significantly reduce potato yield in 1951.
Association Potatoes appeared to mine soil potassium reserves more efficiently than phosphorus reserves.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

With 10 or 15 cm deep water, rice yield showed no decrease compared with 3 cm submergence.

Taxon: rice plantOryza sativae0
Treatment: 10 or 15 cm. deep watere0
Outcome: yielde0
Direction: no decreasee0
Comparator: 3 cm. submergencee0

Verbatim

e0
“With 10 or 15 cm. deep water, growth of rice plant was suppressed at the early stage of tillering period, but afterwards it was recovered and became better than that under 3 cm. submergence, showing no decrease in yield”
✓ located verbatim in the source · abstract, characters 580–799

Title

Studies on Weed Control by Submergence in Rice Cultivation : I. Effect of submergence on the structure of weed communities and the quantity of weeds : II. Effect of submergenec on the growth and yield of rice plant

Masao ARAI; Masuzi MIYAHARA Japanese Journal of Crop Science 1956. doi:10.1626/jcs.24.163

Other claims from this paper (5)

Intervention effect Under 10 or 15 cm deep submergence, absolute weed quantity was smaller than under 3 cm deep submergence.
Intervention effect Under 10 or 15 cm deep submergence, the relative quantity of weeds resistant to 2,4-D was smaller than under 3 cm deep submergence.
Intervention effect With 10 or 15 cm deep water, rice growth was suppressed at the early tillering stage.
Intervention effect With 10 or 15 cm deep water, rice growth afterwards recovered and became better than under 3 cm submergence.
Recommendation The authors suggest weeds could be controlled more effectively by combining deep submergence with 2,4-D herbicide spray.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Mean infection-related leaf area decrease was 4%.

Outcome: leaf areae0
Direction: decreasee0
Value: 4%e0

Not reportedTaxon

Verbatim

e0
“mean decrease in leaf area was only 4%”
✓ located verbatim in the source · abstract, characters 965–1003

Title

AN ANALYSIS OF THE EFFECTS OF INFECTION WITH LEAF‐ROLL VIRUS ON THE GROWTH AND YIELD OF POTATO PLANTS, AND OF ITS INTERACTIONS WITH NUTRIENT SUPPLY AND SHADING

D. J. WATSON; J. H. WILSON Annals of Applied Biology 1956. doi:10.1111/j.1744-7348.1956.tb02134.x

Other claims from this paper (19)

Intervention effect Virus infection decreased total dry weight mainly through tuber dry weight loss.
Intervention effect Infection increased leaf and stem dry weight.
Intervention effect Infection slightly decreased root and stolon dry weight.
Intervention effect Nitrogenous fertilizer reduced virus-related tuber dry weight loss.
Intervention effect Phosphorus and potassium did not affect virus-related tuber loss.
Intervention effect Infection decreased net assimilation rate through early July.
Observation Infected plants had higher later net assimilation rate.
Intervention effect Infection decreased leaf area until early July.
Intervention effect Infection delayed leaf senescence and increased late leaf area.
Observation Mean infection-related net assimilation rate decrease was about 20%.
Mechanism Older rolled leaves had diminished photosynthetic efficiency underlying lower net assimilation.
Observation Nutrient effects on net assimilation and interactions with infection were small and rarely significant.
Intervention effect Nitrogenous fertilizer increased leaf area throughout growth.
Intervention effect Phosphorus increased early leaf area.
Intervention effect Phosphorus hastened senescence and decreased August leaf area.
Intervention effect Potassium increased leaf area particularly later in growth.
Observation Infected plants had more leaves than healthy plants beyond early growth.
Intervention effect Shading decreased net assimilation rate and increased leaf area without affecting yield.
Observation Virus-related yield loss was smaller in Up-to-Date than Craig’s Defiance.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Mean infection-related net assimilation rate decrease was about 20%.

Outcome: NARe0
Direction: decreasee0
Value: about 20%e0

Not reportedTaxon

Verbatim

e0
“mean decrease in NAR by infection was about 20%”
✓ located verbatim in the source · abstract, characters 857–904

Title

AN ANALYSIS OF THE EFFECTS OF INFECTION WITH LEAF‐ROLL VIRUS ON THE GROWTH AND YIELD OF POTATO PLANTS, AND OF ITS INTERACTIONS WITH NUTRIENT SUPPLY AND SHADING

D. J. WATSON; J. H. WILSON Annals of Applied Biology 1956. doi:10.1111/j.1744-7348.1956.tb02134.x

Other claims from this paper (19)

Intervention effect Virus infection decreased total dry weight mainly through tuber dry weight loss.
Intervention effect Infection increased leaf and stem dry weight.
Intervention effect Infection slightly decreased root and stolon dry weight.
Intervention effect Nitrogenous fertilizer reduced virus-related tuber dry weight loss.
Intervention effect Phosphorus and potassium did not affect virus-related tuber loss.
Intervention effect Infection decreased net assimilation rate through early July.
Observation Infected plants had higher later net assimilation rate.
Intervention effect Infection decreased leaf area until early July.
Intervention effect Infection delayed leaf senescence and increased late leaf area.
Observation Mean infection-related leaf area decrease was 4%.
Mechanism Older rolled leaves had diminished photosynthetic efficiency underlying lower net assimilation.
Observation Nutrient effects on net assimilation and interactions with infection were small and rarely significant.
Intervention effect Nitrogenous fertilizer increased leaf area throughout growth.
Intervention effect Phosphorus increased early leaf area.
Intervention effect Phosphorus hastened senescence and decreased August leaf area.
Intervention effect Potassium increased leaf area particularly later in growth.
Observation Infected plants had more leaves than healthy plants beyond early growth.
Intervention effect Shading decreased net assimilation rate and increased leaf area without affecting yield.
Observation Virus-related yield loss was smaller in Up-to-Date than Craig’s Defiance.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Shading slightly decreased seed yield in Kosa-mame.

Taxon: SOYBEANSGlycine maxt0
Material: Kosa-mamee0
Treatment: shadinge0
Outcome: seed yielde0
Direction: slight decreasee0

Not reportedComparator

Verbatim

e0
“In variety Kosa-mame, the effect of shading appeared in the slight decrease of seed yield”
✓ located verbatim in the source · abstract, characters 1013–1102

t0
“SOYBEANS”
✓ located verbatim in the source · title, characters 41–49

Title

ON THE EFFECTS OF SHADING AND PINCHIG IN SOYBEANS.(Preliminary report)

T. NAGATA Japanese Journal of Crop Science 1952. doi:10.1626/jcs.20.335

Other claims from this paper (9)

Intervention effect Shading greatly elongated soybean stems.
Intervention effect Shading restrained soybean branching.
Intervention effect Pinching shaded soybean plants lessened the unfavorable growth effects of shading.
Intervention effect Shading elongated stems in Akazaya-shirodaizu.
Intervention effect Shading restrained branching in Akazaya-shirodaizu.
Intervention effect Shading decreased seed yield in Akazaya-shirodaizu.
Intervention effect Adding pinching checked the unfavorable effects of shading in Akazaya-shirodaizu.
Intervention effect Adding pinching remarkably increased seed yield in Akazaya-shirodaizu.
Intervention effect Adding pinching scarcely influenced seed yield in Kosa-mame.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Cypsela yield fell 10% in the 64-stool plot.

Taxon: Lactuca dracoglossat0
Outcome: cypsela yielde0
Direction: decreasee0
Value: 10%e0
Setting: 64 stoolse0

Verbatim

e0
“The percentage of decrease of cypsela yield was 10% in the plot which consisted of 64 stools”
✓ located verbatim in the source · abstract, characters 1423–1515

t0
“Lactuca dracoglossa”
✓ located verbatim in the source · title, characters 11–30

Title

Studies on Lactuca dracoglossa, MAKINO : II. On yielding seeds

Masaru KOZAKI Japanese Journal of Crop Science 1953. doi:10.1626/jcs.22.131

Other claims from this paper (13)

Intervention effect Increasing stools per unit area decreased clusters of cypsela per stool.
Intervention effect Removing green leaves made the density-related change in cypsela per stool more conspicuous.
Observation Control plots yielded seeds over 21 to 25 days.
Observation Leaf-harvested plots yielded seeds over 35 to 38 days.
Intervention effect Increasing stool density decreased cypsela per cluster in control plots.
Intervention effect The density-related fall in cypsela per cluster was remarkable in leaf-harvested stools.
Observation The weight of 100 fruits ranged from 0.12 to 0.15 gr. in control plots.
Observation The weight of 100 fruits ranged from 0.09 to 0.14 gr. in leaf-harvested plots.
Intervention effect Cypsela yield was larger at 64 than 72 stools per 9.68 square meters.
Observation Control plot cypsela yield ranged from 3.317 to 3.720 l.
Observation Leaf-harvested plot cypsela yield ranged from 2.768 to 3.336 l.
Intervention effect Greater stool density decreased cypsela yield, especially after leaf harvest.
Observation Cypsela yield fell 20% in the 74-stool plot.

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.

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Severe damage reduced wheat yield by about 70%.

Taxon: wheatTriticum aestivumt0
Outcome: yielde0
Direction: decreasee0
Value: 70%e0
Setting: severely suffered fielde0

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 Intermediate damage reduced wheat yield by about 30%.
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.

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“yield decrease”

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