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“yield decrease”

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plus 3 non-evaluative

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1950 ’60 ’70 ’80 ’90 2000 ’10 ’20

plus 13 earlier · 1920s–1940s

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Intervention effectobservedoriginal resultnegativenot significant (as stated)measured

Claim · model-written summary

Ear shading caused a slightly greater yield decrease for Proctor and Herta, without significant varietal differences.

Treatment: shading the earse0
Outcome: grain yielde0
Direction: decreasee0

Not reportedTaxonComparator

Verbatim

e0
“the decrease in grain yield by shading the ears was slightly greater for Proctor and Herta, the differences were not significant.”
✓ located verbatim in the source · abstract, characters 1652–1781

Title

Physiological Causes of Differences in Grain Yield between Varieties of Barley

D. J. WATSON; GILLIAN N. THORNE; S. A. W. FRENCH Annals of Botany 1958. doi:10.1093/oxfordjournals.aob.a083616

Other claims from this paper (19)

Association Proctor and Herta yielded 10—15 per cent more grain than Plumage-Archer without nitrogen fertilizer.
Intervention effect Nitrogen increased the varietal grain yield difference to about 30 per cent.
Intervention effect Higher nitrogen caused Plumage-Archer lodging without increasing its yield.
Observation Proctor and Herta remained standing under higher nitrogen.
Observation The three varieties had similar leaf-area index, net assimilation rate and total dry weight before ear emergence.
Association After ear emergence Herta had a smaller leaf-area index than Proctor and Plumage-Archer.
Observation Shaded-ear pot experiment found nearly equal dry matter contribution per leaf area across varieties.
Mechanism The authors attributed higher yield to photosynthesis by the ears.
Association In pots, Proctor and Herta yielded only about 6 per cent more than Plumage-Archer.
Association Field ear sizes were greater for Proctor and Herta than Plumage-Archer.
Association Ear dry weight at emergence was greater in the higher yielding varieties.
Observation Herta ears may have higher photosynthetic efficiency.
Association Plumage-Archer absorbed more potassium.
Association Herta absorbed less phosphorus than the other varieties.
Observation About a quarter of final nitrogen was absorbed after ear emergence.
Observation A third of phosphorus was absorbed after ear emergence.
Observation Potassium content was nearly maximal at ear emergence and later decreased.
Observation Ear photosynthesis contributed 26 per cent of grain dry matter, including 10 per cent from awns.
Observation Flag-leaf lamina, sheath and peduncle supplied 59 per cent of grain dry matter, and lower shoots supplied 15 per cent.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Selection for nematode resistance did not decrease sugar beet root yield.

Treatment: Selection for resistance to nematodee0
Interactor: nematodeNematodae0pest
Outcome: root yieldse0
Direction: did not decreasee0

Not reportedTaxonComparator

Verbatim

e0
“Selection for resistance to nematode did not decrease root yields.”
✓ located verbatim in the source · abstract, characters 183–249

Title

Breeding Sugar Beets for Resistance to Nematodes¹

R. E. Finkner; J. F. Swink Agronomy Journal 1956. doi:10.2134/agronj1956.00021962004800090001x

Other claims from this paper (1)

Observation Currently grown sugar beet varieties showed moderate nematode resistance by sugar yield.

Intervention effectauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Higher insecticide rates may decrease soybean yield.

Taxon: SoybeansGlycine maxt0
Treatment: higher rates of applicatione0
Outcome: yielde0
Direction: decreasinge0
Qualifier: may cause foliage injurye0

Not reportedComparator

Verbatim

t0
“Soybeans”
✓ located verbatim in the source · title, characters 76–84

e0
“higher rates of application may cause foliage injury to the extent of decreasing yield.”
✓ located verbatim in the source · abstract, characters 173–260

Title

Effect of Foliage Insecticides on Growth, Yield and Chemical Composition of Soybeans¹

A. H. Probst; Ray T. Everly Agronomy Journal 1957. doi:10.2134/agronj1957.00021962004900110003x

Other claims from this paper (6)

Observation The tested organic insecticides were used satisfactorily on soybeans.
Intervention effect Higher insecticide rates may cause soybean foliage injury and reduce yield.
Observation Injurious insect populations remained at sub-economic levels in each study year.
Association Injurious insects were not an important factor affecting soybean growth or yield.
Intervention effect The tested insecticides had little or no effect on seed size, protein and oil content, and oil iodine number.
Recommendation The authors advise applying soybean foliage insecticides at recommended dosages.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Night temperature 2°C below natural from the maximum stage did not promote Akiochi or decrease grain yield.

Taxon: RiceOryza sativat0
Treatment: 2°C 1owere0
Outcome: did note0

Not reportedComparatorDirection

Verbatim

t0
“Rice Plant”
✓ located verbatim in the source · title, characters 55–65

e0
“but 2°C 1ower plots did not”
✓ located verbatim in the source · abstract, characters 323–350

Title

Effect of Night Temperature at Ear-developing Stage on Rice Plant

S. ABE; M. WADA Japanese Journal of Crop Science 1957. doi:10.1626/jcs.26.99

Other claims from this paper (5)

Intervention effect High night temperature from the maximum tillers stage promoted Akiochi.
Intervention effect High night temperature from the maximum stage decreased grain yield.
Observation An 8 plot had the highest yield in the series treated from the maximum stage.
Intervention effect Higher night temperature from heading gave superior yield to natural temperature.
Intervention effect Lower night temperature from heading gave inferior yield to natural temperature.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Nitrogen fertilization tended to decrease alfalfa yields.

Taxon: AlfalfaMedicago sativat0
Treatment: Nitrogen fertilizatione0
Outcome: yieldse0
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 stand persistence.
Intervention effect Phosphorus had no significant beneficial effect on alfalfa.

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.

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.

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.

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“yield decrease”

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