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“yield decrease”

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plus 52 non-evaluative

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1950 ’60 ’70 ’80 ’90 2000 ’10 ’20

plus 31 earlier · 1910s–1940s

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Recommendationauthor interpretationoriginal resultpositivebasis n/a

Claim · model-written summary

Adopting advanced cultivation techniques should considerably reduce rice yield losses from cool-weather damage on the Pacific coast of Aomori.

Taxon: rice plantsOryza sativae0
Treatment: adopting the advanced technique for cultivatione1
Outcome: decrease in rice yield due to the cool weather damagee1
Setting: Pacific coast in Aomori prefecturee0

Verbatim

e0
“studied the weather dependence of the growth of rice plants at the Pacific coast in Aomori prefecture”
✓ located verbatim in the source · abstract, characters 27–128

e1
“the decrease in rice yield due to the cool weather damage should be considerably reduced by adopting the advanced technique for cultivation”
✓ located verbatim in the source · abstract, characters 304–443

Title

On the Environment for Rice Plant at the Pacific Coast in Aomori Prefecture

I. ABE; K. ONO; H. HIGASHIYAMA Journal of Agricultural Meteorology 1964. doi:10.2480/agrmet.20.55

Observationobservedoriginal resultnegativemeasured

Claim · model-written summary

Very high weed mass worsened grain filling.

Taxon: RiceOryza sativat0
Outcome: 稔実もかなり悪くなるe0

Verbatim

t0
“Rice”
✓ located verbatim in the source · title, characters 32–36

e0
“稔実もかなり悪くなる”
✓ located verbatim in the source · abstract, characters 667–677

Title

Estimation of Yield Decrease of Rice due to Weeds in Dry Sowing Culture

Takashi OTA; Shozaburo SAIGO; Yutaka HIRANO Journal of Weed Science and Technology 1963. doi:10.3719/weed.1963.86

Other claims from this paper (8)

Association Mature weed mass and brown-rice yield were strongly negatively correlated, with r = −0.95.
Observation The mature weed mass–yield relation was y = −0.008x + 48.74.
Association Weed mass about 20 days after flooding also related to yield, modeled as y = 43.8×10−0.00046x.
Observation Early weed suppression before flooding was effective in the dry-sown rice system.
Observation The relation between early weed mass and yield could not be resolved.
Observation Weeds reduced rice panicle number most strongly.
Observation Weeds also shortened rice panicles.
Observation Very high weed mass increased lodging.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Precut shading decreased top, stubble and root weights.

Taxon: lucerneMedicago sativat0
Treatment: Shading the plants before cuttinge0
Outcome: weight of tops, stubble, and rootse0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“Shading the plants before cutting produced a large and uniform decrease in the weight of tops, stubble, and roots”
✓ located verbatim in the source · abstract, characters 422–535

t0
“lucerne cultivars”
✓ located verbatim in the source · title, characters 58–75

Title

Shoot numbers, shoot size, and yield of regrowth in three lucerne cultivars

GJ Leach Australian Journal of Agricultural Research 1969. doi:10.1071/ar9690425

Other claims from this paper (7)

Intervention effect Precut shading did not consistently affect basal shoot weight.
Intervention effect Precut shading did not affect total shoot yield two and four weeks after cutting.
Intervention effect Shoots labelled at cutting may have grown less on shaded plants.
Association Shoot numbers and sizes varied between cultivars and cutting treatments.
Association Shoot size depended mainly on duration of growth.
Intervention effect Shoots remaining after severe cutting grew larger than same age shoots after lenient cutting.
Association Regrowth yield within cultivars depends primarily on shoot number and timing of resumed growth.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

RPP declined linearly with weekly defoliation after tasseling.

Taxon: Zea mays L.Zea mayse0
Organ / stage: following tasselinge1
Treatment: defoliation treatmentse1
Outcome: RPPe1
Direction: decreasee1

Not reportedComparator

Verbatim

e0
“Zea mays L.”
✓ located verbatim in the source · abstract, characters 69–80

e1
“There was also a linear decrease in RPP as defoliation treatments were applied at weekly intervals following tasseling”
✓ located verbatim in the source · abstract, characters 434–552

Title

Relative Photosynthetic Potential for Grain Yield of Various Leaf Canopy Levels of Corn¹

J. W. Pendleton; J. J. Hammond Agronomy Journal 1969. doi:10.2134/agronj1969.00021962006100060025x

Other claims from this paper (5)

Observationobservedoriginal resultmeasured

Claim · model-written summary

Tillers in dense plots decreased markedly after peak tillering.

Taxon: RiceOryza sativat0
Outcome: number of tillerse0
Direction: decreasee0

Verbatim

e0
“after that stage, the former showed a marked decrease in the number of tillers.”
✓ located verbatim in the source · abstract, characters 913–992

t0
“Rice”
✓ located verbatim in the source · title, characters 25–29

Title

Studies of Direct-sowing Rice Culture by Broadcasting of Seed on submerged Paddy Field : IV. Relationship of seeding density to plant growth and rice yield

Seiichi AKAMATSU Japanese Journal of Crop Science 1966. doi:10.1626/jcs.35.131

Other claims from this paper (10)

Intervention effect Dense sowing gave higher rice culm height early than sparse sowing.
Intervention effect The early culm height ranking reversed later.
Intervention effect Dense sowing increased tillers per unit area at peak tillering.
Observation At harvest, 90-hill plots had the greatest panicle number, 502 per square meter.
Observation At harvest, 30-hill plots had the smallest panicle number, 304.
Observation More densely sown plots had about 405 panicles, lower than the 90-hill plot.
Intervention effect Rice yield was highest in the 90-hill plot.
Intervention effect Rice yield above 120 hills was lower than in the 90-hill plot.
Mechanism The authors attributed lower dense-plot yield to inadequate customary fertilizer in later growth.
Recommendation Improved split fertilizer application may make dense-plot rice yield more favorable.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

More seedlings per hill decreased shoots per plant.

Taxon: RiceOryza sativat0
Treatment: Increasing the number of seedlings per hille1
Outcome: number of shoots per plante1
Direction: decreasee1

Not reportedComparator

Verbatim

e1
“Increasing the number of seedlings per hill resulted in an increase in the number of shoots per hill but a decrease in the number of shoots per plant”
✓ located verbatim in the source · abstract, characters 585–734

t0
“Growth and Yield of Rice”
✓ located verbatim in the source · title, characters 74–98

Title

Effects of Hill Spacing, Number of Plants Per Hill and Nitrogen Supply on Growth and Yield of Rice

B. A. C. Enyi Experimental Agriculture 1965. doi:10.1017/s0014479700100456

Other claims from this paper (8)

Intervention effect Highest shoot numbers occurred under high nitrogen and high plant density.
Intervention effect More seedlings per hill raised shoots per plot.
Intervention effect More seedlings per hill increased shoots per hill.
Intervention effect Three seedlings per hill raised grain yield per unit area by 12%.
Intervention effect Four seedlings per hill raised grain yield per unit area by 9%.
Intervention effect Shoot mortality was greater at low than at high plant density.
Intervention effect High nitrogen with four seedlings per hill increased days from seeding to ear emergence.
Recommendation The best combination for high grain yield was high nitrogen, 15 cm x 15 cm spacing and four seedlings per hill.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Nitrogen fertilization reduced Ladino clover proportion.

Taxon: Ladino clovere0
Treatment: Nitrogen fertilizatione0
Outcome: per cent Ladino clovere0
Direction: decreasee0

Not reportedComparator

Verbatim

e0
“Nitrogen fertilization tended to decrease the per cent Ladino clover and the protein and calcium content in the clover-grass forage”
✓ located verbatim in the source · abstract, characters 572–703

Title

SOME EFFECTS OF FERTILIZATION ON THE YIELD, BOTANICAL AND CHEMICAL COMPOSITION OF IRRIGATED GRASS AND GRASS-CLOVER PASTURE SWARDS

E. H. Gardner; T. L. Jackson; G. R. Webster; et al. Canadian Journal of Plant Science 1960. doi:10.4141/cjps60-072

Other claims from this paper (15)

Observation Irrigated Ladino clover-grass outproduced grass mixture for forage, protein and mineral nutrient yield.
Observation Grass mixture required heavy nitrogen and potassium fertilization for moderate yield.
Observation High Ladino clover-grass yields did not require nitrogen fertilizer.
Intervention effect Nitrogen fertilization reduced protein and calcium content of clover-grass forage.
Intervention effect Nitrogen fertilization increased protein content of grass herbage.
Intervention effect Nitrogen fertilization reduced calcium content of grass herbage.
Intervention effect Nitrogen fertilization did not appreciably alter phosphorus and magnesium content of either herbage mixture.
Intervention effect Shorter intervals between nitrogen applications evened dry matter production across the season.
Intervention effect Shorter intervals between nitrogen applications did not increase seasonal yield.
Intervention effect Potassium fertilization increased yield of both pasture mixtures.
Intervention effect Potassium fertilization increased clover percentage in grass-clover sward.
Observation Multiple years of potassium applications eliminated plant potassium deficiency symptoms.
Observation Applied potassium was rapidly absorbed by plants.
Observation Grass herbage contained more potassium and phosphorus than grass-clover herbage.
Observation Grass herbage contained less calcium, magnesium and nitrogen than grass-clover herbage.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Reduced light intensity was associated with lower yield of bahiagrass.

Taxon: bahiagrasse0
Treatment: light intensitye1
Outcome: yielde1
Direction: decreasee1

Verbatim

e0
“Experiments were carried out to determine the effect of light intensity and nitrogen fertilizer supply on the yields and nitrate nitrogen contents in bahiagrass and bermudagrass”
✓ located verbatim in the source · abstract, characters 0–177

e1
“A reduction in light intensity was associated with a decrease in yield, and the an increase in nitrate contents in both grasses”
✓ located verbatim in the source · abstract, characters 380–507

Title

Studies on Nitrate Nitrogen Contents in Forage Crops. : 2. Effect of four levels of light intensity and two levels of nitrogen on yields and nitrate natrogen contents of Bahiagrass (Paspalum notatum FLUGGE) and Bermudagrass (Cynodon dactylon PERS.)

Kaoru EHARA; Yoshio YAMADA; Raizaburo UMETSU Japanese Journal of Crop Science 1968. doi:10.1626/jcs.37.59

Other claims from this paper (10)

Association Reduced light intensity was associated with lower yield of bermudagrass.
Association Reduced light intensity was associated with higher nitrate content in bahiagrass.
Association Reduced light intensity was associated with higher nitrate content in bermudagrass.
Intervention effect Under sufficient light, high-N bahiagrass tended to yield more than low-N bahiagrass.
Intervention effect Under sufficient light, high-N bermudagrass tended to yield more than low-N bermudagrass.
Intervention effect Under insufficient light, the high-N yield advantage of bahiagrass was reversed.
Intervention effect Under insufficient light, the high-N yield advantage of bermudagrass was reversed.
Intervention effect High-N bahiagrass tended to have higher protein content than low-N bahiagrass under all experimental conditions.
Intervention effect High-N bermudagrass tended to have higher protein content than low-N bermudagrass under all experimental conditions.
Mechanism Nitrate accumulation in plants indicates that nitrogen assimilation could not keep pace with nitrate uptake.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Reduced light intensity was associated with lower yield of bermudagrass.

Taxon: bermudagrassCynodon dactylone0
Treatment: light intensitye1
Outcome: yielde1
Direction: decreasee1

Verbatim

e0
“Experiments were carried out to determine the effect of light intensity and nitrogen fertilizer supply on the yields and nitrate nitrogen contents in bahiagrass and bermudagrass”
✓ located verbatim in the source · abstract, characters 0–177

e1
“A reduction in light intensity was associated with a decrease in yield, and the an increase in nitrate contents in both grasses”
✓ located verbatim in the source · abstract, characters 380–507

Title

Kaoru EHARA; Yoshio YAMADA; Raizaburo UMETSU Japanese Journal of Crop Science 1968. doi:10.1626/jcs.37.59

Other claims from this paper (10)

Association Reduced light intensity was associated with lower yield of bahiagrass.
Association Reduced light intensity was associated with higher nitrate content in bahiagrass.
Association Reduced light intensity was associated with higher nitrate content in bermudagrass.
Intervention effect Under sufficient light, high-N bahiagrass tended to yield more than low-N bahiagrass.
Intervention effect Under sufficient light, high-N bermudagrass tended to yield more than low-N bermudagrass.
Intervention effect Under insufficient light, the high-N yield advantage of bahiagrass was reversed.
Intervention effect Under insufficient light, the high-N yield advantage of bermudagrass was reversed.
Intervention effect High-N bahiagrass tended to have higher protein content than low-N bahiagrass under all experimental conditions.
Intervention effect High-N bermudagrass tended to have higher protein content than low-N bermudagrass under all experimental conditions.
Mechanism Nitrate accumulation in plants indicates that nitrogen assimilation could not keep pace with nitrate uptake.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Mature weed mass and brown-rice yield were strongly negatively correlated, with r = −0.95.

Taxon: RiceOryza sativat0
Interactor: 雑草e0weed
Outcome: 収量e0
Value: -0.95e0

Not reportedDirection

Verbatim

t0
“Rice”
✓ located verbatim in the source · title, characters 32–36

e0
“成熟期における雑草量 (x, 生体重g/m2) と収量 (y, 玄米重kg/a) との間に相関係数-0.95という高い相関がみられ”
✓ located verbatim in the source · abstract, characters 306–371

Title

Estimation of Yield Decrease of Rice due to Weeds in Dry Sowing Culture

Takashi OTA; Shozaburo SAIGO; Yutaka HIRANO Journal of Weed Science and Technology 1963. doi:10.3719/weed.1963.86

Other claims from this paper (8)

Observation The mature weed mass–yield relation was y = −0.008x + 48.74.
Association Weed mass about 20 days after flooding also related to yield, modeled as y = 43.8×10−0.00046x.
Observation Early weed suppression before flooding was effective in the dry-sown rice system.
Observation The relation between early weed mass and yield could not be resolved.
Observation Weeds reduced rice panicle number most strongly.
Observation Weeds also shortened rice panicles.
Observation Very high weed mass increased lodging.
Observation Very high weed mass worsened grain filling.

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“yield decrease”

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