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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 resultno effectmeasured

Claim · model-written summary

Pre-emergence spray of 150 g 2,4-D per 10 ares did not decrease soybean yield.

Taxon: soybeanGlycine maxe0
Treatment: pre-emergence spray of 150 grams of 2, 4-D per 10 arese0
Outcome: the yield of soybeane0
Direction: without decreasinge0

Not reportedComparator

Verbatim

e0
“The pre-emergence spray of 150 grams of 2, 4-D per 10 ares was considerably effective for the weed without decreasing the yield of soybean”
✓ located verbatim in the source · abstract, characters 1015–1153

Title

Some tests on the weed control in sweet potato and soybean fields with 2, 4-D

Yasuo KASAHARA; Tadaji KIMURA; Osamu KINOSITA Japanese Journal of Crop Science 1954. doi:10.1626/jcs.22.3-4_5

Other claims from this paper (17)

Observation Crab grass is a dominant weed in both sweet potato and soybean fields.
Observation Crab grass is resistant to 2,4-D.
Observation Both sweet potato and soybean are susceptible to 2,4-D.
Recommendation Post-emergence 2,4-D spray on these crops cannot be expected to be a practical weed-control means.
Intervention effect Sweet potato yield under pre-planting 2,4-D equalled that of the weeded plot.
Intervention effect Weeds were reduced to about 1/10 to 1/3 of those in the untreated plot after 2,4-D pre-planting treatment.
Intervention effect All sweet potato slips planted after 2,4-D treatment took root and crop growth was not retarded.
Intervention effect Sweet potato planted immediately after 2,4-D application was severely injured, particularly in the drought year.
Intervention effect Moistening and dusting sweet potato roots with active carbon relieved the 2,4-D injury to some extent.
Intervention effect Pre-emergence spray of 150 g 2,4-D per 10 ares was considerably effective against the weeds in soybean.
Intervention effect A 2,4-D spray above 150 grams was injurious to soybean growth.
Intervention effect Seeds coated with active carbon before sowing were not injured even by a spray of 450 g 2,4-D.
Mechanism The absence of injury was attributed to a protecting action of active carbon.
Intervention effect Between-row soil treatment with 2,4-D after tillage was more effective on annual weeds than pre-emergence treatment.
Intervention effect Soybean was not injured by 100 g 2,4-D per 10 ares on dry soil.
Intervention effect Soybean was not injured by 200 g 2,4-D on moist soil.
Association Yield decreased as the amount of 2,4-D applied increased.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

The authors attribute ridge soil nutrient deficiency to oxidative soil conditions and link it to lower yield.

Taxon: Rice PlantsOryza sativat0
Outcome: yield decreasee0
Direction: decreasee0
Qualifier: striking development of the oxidative state in soilse0

Verbatim

t0
“Rice Plants”
✓ located verbatim in the source · title, characters 44–55

e0
“This nutritive deficiency was largely attributed to the striking development of the oxidative state in soils as already reported in the previous paper, and consequently caused the yield decrease.”
✓ located verbatim in the source · abstract, characters 2304–2499

Title

Fundamental Studies on the Ridge-Culture of Rice Plants : (4) Contents of Nitrogen and Carbondioxide in Soils, and the Plant Growth and Yields.

Tdayo WATABE; Kouji KITAGAWA; Yoshikazu YAGI; et al. Japanese Journal of Crop Science 1955. doi:10.1626/jcs.23.163

Other claims from this paper (17)

Observation Soil NH3-N decreased more rapidly under ridge than level culture.
Observation Ridge soils had more NO3-N than control soils.
Observation Ridge soils had more carbondioxide than control soils.
Intervention effect Rice plant height was greater in ridge plots during vegetative growth.
Intervention effect Rice tiller count was greater in ridge plots during vegetative growth.
Intervention effect Rice leaf blade nitrogen content was greater in ridge plots during vegetative growth.
Observation During generative growth, the earlier ridge advantage in height, tillers and leaf nitrogen reversed.
Intervention effect Rice root maximum length exceeded controls under ridge culture throughout growth.
Intervention effect Rice root dry weight exceeded controls under ridge culture throughout growth.
Observation Rice top-to-root ratio was higher under level culture than ridge culture.
Observation Rice heading was somewhat earlier in ridge plots than controls.
Intervention effect Rice grain weight per plant was greater in controls than ridge plots.
Intervention effect Rice grains per ear were greater in controls than ridge plots.
Intervention effect Grain weights relative to culm and leaf weights were markedly smaller in ridge plots.
Intervention effect Ridge culture reduced rice yield per unit area by 11∼23% compared with controls.
Mechanism Better ridge soil physical conditions may favor rice vegetative vigor.
Mechanism The authors attribute the decline of rice vegetative growth during generative growth to nutrient deficiency in ridge soil.

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Training laterals increased yield by reducing inferior-grade flowers.

Taxon: Hopt0
Treatment: training lateral branchese1
Outcome: yielde0
Direction: heightenede0
Qualifier: decrease in the number of flowers of inferior gradee0

Not reportedComparator

Verbatim

e0
“the yield was heightened through the decrease in the number of flowers of inferior grade.”
✓ located verbatim in the source · abstract, characters 1755–1844

t0
“Hop”
✓ located verbatim in the source · title, characters 118–121

e1
“The output of cone was increased by training lateral branches, while the yield was heightened through the decrease in the number of flowers of inferior grade.”
✓ located verbatim in the source · abstract, characters 1686–1844

Title

STUDIES ON THE METHODS OF CULTIVATION IN HOP-PLANT. : 1. Effect of Training the Laterals in Place of the Main Stem in Hop

T. MUROGA; Y. AONUMA Japanese Journal of Crop Science 1952. doi:10.1626/jcs.20.329

Other claims from this paper (8)

Intervention effect Stem nipping accelerated growth.
Intervention effect Nipping did not delay flowering or cone formation despite later lateral training.
Intervention effect Excessively delayed training of tertiary laterals caused early reproductive transition before adequate branch elongation.
Intervention effect Trained laterals had a slightly higher effective node percentage.
Intervention effect Nipping increased the effective node percentage on lower and middle laterals.
Intervention effect Training laterals increased cone output.
Intervention effect Lateral training did not degrade cone quality.
Intervention effect Lateral training did not decrease cone size.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Ear shading reduced yield by 8%.

Treatment: shading of ite0
Outcome: yielde0
Direction: decreasee0
Value: 8 %e0

Not reportedTaxonComparator

Verbatim

e0
“shading of it induced a decrease of 8 % of yield”
✓ located verbatim in the source · abstract, characters 1132–1180

Title

Studies on CO₂ Exchange in Crop Plants : IV. Roles played by the various parts of the photosynthetic organd of rice plant in producing grains during the ripening period.

T. TAKEDA; H. MARUTA Japanese Journal of Crop Science 1956. doi:10.1626/jcs.24.181

Other claims from this paper (15)

Intervention effect Shading ears from heading substantially affected grain yield.
Intervention effect Shading and defoliation of leaves from heading substantially affected yield.
Intervention effect Treatments started 20 days after heading had negligible yield effects.
Intervention effect Treatments begun 10 days after heading had intermediate effects.
Observation Carbohydrate translocation to grain nearly finished 20 days after heading.
Observation About one third of grain yield came from assimilates made before heading.
Observation The ear acted as an assimilating organ.
Observation Ear apparent photosynthesis was very low or negative.
Mechanism Large ear respiration may explain low apparent photosynthesis.
Observation Flag leaves remained photosynthetic after heading.
Observation Second, third and fourth leaves were more important as storage than photosynthetic organs.
Observation Fourth-leaf photosynthetic activity declined markedly as rice matured.
Observation Third-leaf photosynthetic activity declined after the fourth leaf.
Observation Second-leaf photosynthetic activity declined after the third leaf.
Observation Flag-leaf photosynthetic activity persisted until late ripening.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Greater stool density decreased cypsela yield, especially after leaf harvest.

Taxon: Lactuca dracoglossat0
Treatment: increased number of stools for unit areae0
Outcome: yield of cypselae0
Direction: decreasee0
Qualifier: especially in the leaf-harvested stoolse0

Not reportedComparator

Verbatim

e0
“Planting increased number of stools for unit area made the yield of cypsela decrease especially in the leaf-harvested stools”
✓ located verbatim in the source · abstract, characters 1297–1421

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.
Observation Cypsela yield fell 10% in the 64-stool plot.
Observation Cypsela yield fell 20% in the 74-stool plot.

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Phosphate decreased weed yield in the second cut.

Taxon: PERENNIAL RYEGRASSLolium perennet0
Outcome: weed yielde1
Direction: decreasee0

Not reportedTreatmentComparator

Verbatim

e0
“this was offset by a large decrease in the second cut”
✓ located verbatim in the source · abstract, characters 913–966

e1
“Although the former gave a large increase in weed yield in the first cut”
✓ located verbatim in the source · abstract, characters 840–912

t0
“PERENNIAL RYEGRASS”
✓ located verbatim in the source · title, characters 81–99

Title

THE EFFECT OF WEEDS, AND THEIR CONTROL BY MCPA SPRAYING, ON THE ESTABLISHMENT OF PERENNIAL RYEGRASS AND COCKSFOOT IN THE KENYA HIGHLANDS

W. R. Birch Grass and Forage Science 1958. doi:10.1111/j.1365-2494.1958.tb00123.x

Other claims from this paper (8)

Intervention effect MCPA spraying increased grass yields twofold to threefold on weedy land.
Recommendation The optimum time to spray perennial ryegrass was at three to four leaves or 26 days after sowing.
Recommendation For cocksfoot the best spray time was tillering or about 40 days after sowing.
Intervention effect Increasing ryegrass seed rates transiently increased yields.
Intervention effect Increasing ryegrass seed rates decreased weed yields.
Intervention effect Increasing phosphate decreased weed yields.
Intervention effect Increasing nitrogen decreased weed yields.
Intervention effect Phosphate increased weed yield in the first cut.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing solution boron decreased strawberry fruit yield.

Taxon: strawberryFragaria ×ananassae1
Treatment: Increasing the concentration of boron in the culture solutione0
Outcome: yield of fruite0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“Increasing the concentration of boron in the culture solution tended to increase the accumulation of boron by the plants and to decrease their yield of fruit.”
✓ located verbatim in the source · abstract, characters 530–688

e1
“strawberry plants”
✓ located verbatim in the source · abstract, characters 172–189

Title

MAGNESIUM, CALCIUM, AND BORON NUTRITION OF THE STRAWBERRY IN RELATION TO BLACK ROOT DISEASE

C. D. Taper; W. B. Collins; H. R. Murray; et al. Canadian Journal of Plant Science 1957. doi:10.4141/cjps57-020

Other claims from this paper (5)

Intervention effect Increasing magnesium solution concentration increased plant magnesium accumulation.
Intervention effect Increasing magnesium solution concentration decreased plant calcium accumulation.
Intervention effect Increasing solution boron increased plant boron accumulation.
Intervention effect At 0.5 p.p.m. boron, all plants developed marginal leaf chlorosis and necrotic crowns and roots.
Mechanism The authors interpreted crown and root necrosis accompanying chlorosis as possible boron toxicity.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Lower grain yield under submergence was associated with decrease in number of heads per plant, caused by decay of heads after interrupted internode elongation and early tillering.

Taxon: naked barleyt0
Organ / stage: heading staget0
Outcome: decrease in number of heads per plante5
Qualifier: decaying of head after the interruption of internode elongation in parent stalk and early appeared tilleringse6

Verbatim

t0
“Submerging injury to naked barley on heading stage”
✓ located verbatim in the source · title, characters 62–112

e5
“The lowering of products above-mentioned was due to both of occurrence of sterile spikelet and decrease in number of heads per plant”
✓ located verbatim in the source · abstract, characters 449–581

e6
“The latter was caused by the decaying of head after the interruption of internode elongation in parent stalk and early appeared tillerings”
✓ located verbatim in the source · abstract, characters 718–856

Title

Studies on Submerging Injury of Naked Barley and Wheat. : IV. Submerging injury to naked barley on heading stage

Kazunori IBARAKI Japanese Journal of Crop Science 1957. doi:10.1626/jcs.26.117

Other claims from this paper (4)

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Ridge culture reduced rice yield per unit area by 11∼23% compared with controls.

Taxon: Rice PlantsOryza sativat0
Treatment: ridge plotse0
Outcome: yield per unit areae0
Direction: decreasee0
Value: 11∼23%e0
Comparator: controlse0

Verbatim

t0
“Rice Plants”
✓ located verbatim in the source · title, characters 44–55

e0
“11∼23% decrease of yield per unit area appeared in the ridge plots compared with the controls.”
✓ located verbatim in the source · abstract, characters 1886–1980

Title

Fundamental Studies on the Ridge-Culture of Rice Plants : (4) Contents of Nitrogen and Carbondioxide in Soils, and the Plant Growth and Yields.

Tdayo WATABE; Kouji KITAGAWA; Yoshikazu YAGI; et al. Japanese Journal of Crop Science 1955. doi:10.1626/jcs.23.163

Other claims from this paper (17)

Observation Soil NH3-N decreased more rapidly under ridge than level culture.
Observation Ridge soils had more NO3-N than control soils.
Observation Ridge soils had more carbondioxide than control soils.
Intervention effect Rice plant height was greater in ridge plots during vegetative growth.
Intervention effect Rice tiller count was greater in ridge plots during vegetative growth.
Intervention effect Rice leaf blade nitrogen content was greater in ridge plots during vegetative growth.
Observation During generative growth, the earlier ridge advantage in height, tillers and leaf nitrogen reversed.
Intervention effect Rice root maximum length exceeded controls under ridge culture throughout growth.
Intervention effect Rice root dry weight exceeded controls under ridge culture throughout growth.
Observation Rice top-to-root ratio was higher under level culture than ridge culture.
Observation Rice heading was somewhat earlier in ridge plots than controls.
Intervention effect Rice grain weight per plant was greater in controls than ridge plots.
Intervention effect Rice grains per ear were greater in controls than ridge plots.
Intervention effect Grain weights relative to culm and leaf weights were markedly smaller in ridge plots.
Mechanism Better ridge soil physical conditions may favor rice vegetative vigor.
Mechanism The authors attribute the decline of rice vegetative growth during generative growth to nutrient deficiency in ridge soil.
Mechanism The authors attribute ridge soil nutrient deficiency to oxidative soil conditions and link it to lower yield.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Repeated cropping reduced mean yield from 27 to 15 and 10 cwt per acre.

Taxon: winter wheatTriticum aestivumt0
Outcome: mean yielde0
Direction: decreasee0
Value: 27 cwt.e0
Qualifier: 15 and 10 cwt./acree0

Verbatim

e0
“decrease in mean yield from 27 cwt. in the first, to 15 and 10 cwt./acre in the second and third crops”
✓ located verbatim in the source · abstract, characters 552–654

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 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 failed to decrease take-all.
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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