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“yield decrease”

9 matches

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plus 2 non-evaluative

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1930 ’40 ’50 ’60 ’70 ’80 ’90 2000 ’10 ’20

plus 4 earlier · 1910s–1920s

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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.

Intervention effectobservedoriginal resultno effectnot significant (as stated)measured

Claim · model-written summary

Minor leaf injuries did not significantly decrease yield.

Taxon: cornZea mays subsp. mayst0
Treatment: Minor leaf injuriese0
Outcome: yielde0
Direction: did not result in significant decreasese0

Not reportedComparator

Verbatim

e0
“Minor leaf injuries which were designed to upset the elaboration and translocation of synthesized plant food did not result in significant decreases in yield”
✓ located verbatim in the source · abstract, characters 1392–1549

t0
“corn plant”
✓ located verbatim in the source · title, characters 75–85

Title

The effect of injury in imitation of hail damage on the development of the corn plant

J. C. Eldredge Iowa State University Digital Repository (Iowa State University) 1935

Other claims from this paper (19)

Intervention effect Total leaf removal reduced corn yield in proportion to unrolled leaf percentage.
Intervention effect Total leaf removal caused 9 percent yield reduction in early June.
Intervention effect Total leaf removal caused 100 percent yield reduction near July 20 before tasseling.
Intervention effect Severe shredding reduced early-June yield by 2 percent.
Intervention effect Severe shredding caused 50 percent yield reduction before tasseling.
Intervention effect Removing one-third of leaves caused 30 percent yield reduction at tasseling-silking.
Intervention effect Removing two-thirds of leaves caused 70 percent yield reduction at tasseling-silking.
Intervention effect Removing half of each leaf before tasseling reduced yield 27 percent.
Intervention effect Removing half of each leaf at full tasseling reduced yield 33 percent.
Intervention effect Removing half of each leaf at milk stage reduced yield 13 percent.
Intervention effect Severe bruising of stalks and ears before tasseling reduced yield 20 percent.
Intervention effect Combined bruising and shredding reduced yield 64 percent before tasseling.
Intervention effect Combined bruising and shredding reduced yield 77 percent at tasseling.
Intervention effect Corn strains did not significantly differ in yield reduction from severe shredding.
Intervention effect Under severe drought, leaf and stalk injury reduced yield less than in normal seasons.
Intervention effect In June drought, injured plots yielded somewhat more than checks.
Intervention effect Leaf and stalk injury usually caused little reduction in kernel development by bushel test weight.
Intervention effect Ear bruising produced 2 to 3 percent damaged kernels.
Intervention effect Injury before tasseling increased smutted plants; other corn diseases showed no noticeable increase.

Associationobservedoriginal resultmeasured

Claim · model-written summary

Yield decrease under leaf rust was due more to lower kernel weight than to fewer kernels per head

Taxon: Thatcher and Renown wheate0
Treatment: leaf ruste1
Outcome: The decrease in yielde4
Direction: due more toe4
Qualifier: reduction in kernel weighte4

Verbatim

e0
“A study was made at Winnipeg in 1938 to determine the effect of leaf rust on the yield and quality of Thatcher and Renown wheat”
✓ located verbatim in the source · abstract, characters 0–127

e4
“The decrease in yield was due more to reduction in kernel weight than to reduction in number of kernels per head”
✓ located verbatim in the source · abstract, characters 619–731

e1
“In the 1/400-acre plots, leaf rust reduced the yield of Thatcher and Renown by 51.17 and 29.61%, respectively”
✓ located verbatim in the source · abstract, characters 442–551

Title

THE EFFECT OF LEAF RUST ON THE YIELD AND QUALITY OF THATCHER AND RENOWN WHEAT IN 1938

B. Peturson; Margaret Newton Canadian Journal of Research/Canadian journal of research 1939. doi:10.1139/cjr39c-038

Other claims from this paper (7)

Intervention effect Leaf rust reduced yield of Thatcher by 51.17% in 1/400-acre plots
Intervention effect Leaf rust reduced yield of Renown by 29.61% in 1/400-acre plots
Intervention effect Leaf rust reduced yield of Thatcher by 37.02% in rod-row plots
Intervention effect Non-dusted plots ripened about three days earlier than dusted plots under leaf rust
Intervention effect Grain from non-dusted plots graded one grade lower than grain from dusted plots under leaf rust
Intervention effect Leaf rust reduced grain protein content in both Thatcher and Renown wheat
Intervention effect Leaf rust increased grain carotene content in both Thatcher and Renown wheat

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 resultpositivemeasured

Claim · model-written summary

Under severe drought, leaf and stalk injury reduced yield less than in normal seasons.

Taxon: cornZea mays subsp. mayst0
Treatment: leaf and stalk injuriese0
Outcome: yielde0
Direction: did not result in as great a decreasee0
Comparator: normal seasonse0

Verbatim

e0
“Severe drouth in 1930 caused moisture to become the limiting factor so that leaf and stalk injuries did not result in as great a decrease in yield as in normal seasons”
✓ located verbatim in the source · abstract, characters 2452–2619

t0
“corn plant”
✓ located verbatim in the source · title, characters 75–85

Title

The effect of injury in imitation of hail damage on the development of the corn plant

J. C. Eldredge Iowa State University Digital Repository (Iowa State University) 1935

Other claims from this paper (19)

Intervention effect Total leaf removal reduced corn yield in proportion to unrolled leaf percentage.
Intervention effect Total leaf removal caused 9 percent yield reduction in early June.
Intervention effect Total leaf removal caused 100 percent yield reduction near July 20 before tasseling.
Intervention effect Severe shredding reduced early-June yield by 2 percent.
Intervention effect Severe shredding caused 50 percent yield reduction before tasseling.
Intervention effect Removing one-third of leaves caused 30 percent yield reduction at tasseling-silking.
Intervention effect Removing two-thirds of leaves caused 70 percent yield reduction at tasseling-silking.
Intervention effect Removing half of each leaf before tasseling reduced yield 27 percent.
Intervention effect Removing half of each leaf at full tasseling reduced yield 33 percent.
Intervention effect Removing half of each leaf at milk stage reduced yield 13 percent.
Intervention effect Minor leaf injuries did not significantly decrease yield.
Intervention effect Severe bruising of stalks and ears before tasseling reduced yield 20 percent.
Intervention effect Combined bruising and shredding reduced yield 64 percent before tasseling.
Intervention effect Combined bruising and shredding reduced yield 77 percent at tasseling.
Intervention effect Corn strains did not significantly differ in yield reduction from severe shredding.
Intervention effect In June drought, injured plots yielded somewhat more than checks.
Intervention effect Leaf and stalk injury usually caused little reduction in kernel development by bushel test weight.
Intervention effect Ear bruising produced 2 to 3 percent damaged kernels.
Intervention effect Injury before tasseling increased smutted plants; other corn diseases showed no noticeable increase.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Another barley variety showed decreased thousand-grain weight.

Taxon: barleyHordeum vulgaret0
Treatment: low-temperature grain pre-treatmentt1
Outcome: 1000-grain weighte2
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“one being unaffected, another showing a decrease, while the third showed an increase.”
✓ located verbatim in the source · abstract, characters 1326–1411

t0
“wheat and barley”
✓ located verbatim in the source · title, characters 107–123

t1
“low-temperature grain pre-treatment”
✓ located verbatim in the source · title, characters 14–49

e2
“Only one wheat variety showed an increase in 1000-grain weight”
✓ located verbatim in the source · abstract, characters 1051–1113

Title

The effect of low-temperature grain pre-treatment on the development, yield and grain of some varieties of wheat and barley

G. D. H. Bell The Journal of Agricultural Science 1937. doi:10.1017/s0021859600051674

Other claims from this paper (17)

Intervention effect Pretreatment reduced tiller number in winter wheat and barley.
Intervention effect Pretreatment did not affect ear number at harvest.
Intervention effect Spring wheat tillers decreased slightly.
Intervention effect Gross plot yields were unaffected in all varieties.
Intervention effect Yield per plant generally increased in wheat varieties.
Intervention effect One barley variety showed unchanged yield per ear.
Intervention effect Another barley variety showed increased yield per ear.
Intervention effect A third barley variety showed reduced yield per ear.
Intervention effect One wheat variety showed increased thousand-grain weight.
Intervention effect Wheat varieties differed in grain nitrogen response.
Intervention effect One barley variety showed unchanged thousand-grain weight.
Intervention effect A third barley variety showed increased thousand-grain weight.
Association Maximum tiller number had little relation to ear number at harvest.
Association High barley yield and low nitrogen accompanied the largest ear number.
Association In barley the largest ear number accompanied lowest tillering.
Association In wheat high yield associated with high thousand-grain weight.
Observation Spring varieties outyielded winter varieties in both experiments.

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.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

One barley variety showed unchanged thousand-grain weight.

Taxon: barleyHordeum vulgaret0
Treatment: low-temperature grain pre-treatmentt1
Outcome: 1000-grain weighte2
Direction: unaffectede0

Not reportedComparator

Verbatim

e0
“one being unaffected, another showing a decrease, while the third showed an increase.”
✓ located verbatim in the source · abstract, characters 1326–1411

t0
“wheat and barley”
✓ located verbatim in the source · title, characters 107–123

t1
“low-temperature grain pre-treatment”
✓ located verbatim in the source · title, characters 14–49

e2
“Only one wheat variety showed an increase in 1000-grain weight”
✓ located verbatim in the source · abstract, characters 1051–1113

Title

The effect of low-temperature grain pre-treatment on the development, yield and grain of some varieties of wheat and barley

G. D. H. Bell The Journal of Agricultural Science 1937. doi:10.1017/s0021859600051674

Other claims from this paper (17)

Intervention effect Pretreatment reduced tiller number in winter wheat and barley.
Intervention effect Pretreatment did not affect ear number at harvest.
Intervention effect Spring wheat tillers decreased slightly.
Intervention effect Gross plot yields were unaffected in all varieties.
Intervention effect Yield per plant generally increased in wheat varieties.
Intervention effect One barley variety showed unchanged yield per ear.
Intervention effect Another barley variety showed increased yield per ear.
Intervention effect A third barley variety showed reduced yield per ear.
Intervention effect One wheat variety showed increased thousand-grain weight.
Intervention effect Wheat varieties differed in grain nitrogen response.
Intervention effect Another barley variety showed decreased thousand-grain weight.
Intervention effect A third barley variety showed increased thousand-grain weight.
Association Maximum tiller number had little relation to ear number at harvest.
Association High barley yield and low nitrogen accompanied the largest ear number.
Association In barley the largest ear number accompanied lowest tillering.
Association In wheat high yield associated with high thousand-grain weight.
Observation Spring varieties outyielded winter varieties in both experiments.

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

A third barley variety showed increased thousand-grain weight.

Taxon: barleyHordeum vulgaret0
Treatment: low-temperature grain pre-treatmentt1
Outcome: 1000-grain weighte2
Direction: increasee0

Not reportedComparator

Verbatim

e0
“one being unaffected, another showing a decrease, while the third showed an increase.”
✓ located verbatim in the source · abstract, characters 1326–1411

t0
“wheat and barley”
✓ located verbatim in the source · title, characters 107–123

t1
“low-temperature grain pre-treatment”
✓ located verbatim in the source · title, characters 14–49

e2
“Only one wheat variety showed an increase in 1000-grain weight”
✓ located verbatim in the source · abstract, characters 1051–1113

Title

The effect of low-temperature grain pre-treatment on the development, yield and grain of some varieties of wheat and barley

G. D. H. Bell The Journal of Agricultural Science 1937. doi:10.1017/s0021859600051674

Other claims from this paper (17)

Intervention effect Pretreatment reduced tiller number in winter wheat and barley.
Intervention effect Pretreatment did not affect ear number at harvest.
Intervention effect Spring wheat tillers decreased slightly.
Intervention effect Gross plot yields were unaffected in all varieties.
Intervention effect Yield per plant generally increased in wheat varieties.
Intervention effect One barley variety showed unchanged yield per ear.
Intervention effect Another barley variety showed increased yield per ear.
Intervention effect A third barley variety showed reduced yield per ear.
Intervention effect One wheat variety showed increased thousand-grain weight.
Intervention effect Wheat varieties differed in grain nitrogen response.
Intervention effect One barley variety showed unchanged thousand-grain weight.
Intervention effect Another barley variety showed decreased thousand-grain weight.
Association Maximum tiller number had little relation to ear number at harvest.
Association High barley yield and low nitrogen accompanied the largest ear number.
Association In barley the largest ear number accompanied lowest tillering.
Association In wheat high yield associated with high thousand-grain weight.
Observation Spring varieties outyielded winter varieties in both experiments.

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“yield decrease”

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