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“yield decrease”

254 matches

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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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Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Manganese chelates greatly decreased yield on phosphorus only plots.

Taxon: SoybeanGlycine maxt0
Treatment: Mn chelatese0
Outcome: yielde0
Direction: decreasee0
Qualifier: P onlye0

Not reportedComparator

Verbatim

e0
“Applications of Mn chelates gave a slight increase in yield on plots that received high rates of P and K and a large decrease on plots that received P only.”
✓ located verbatim in the source · abstract, characters 271–427

t0
“Soybean”
✓ located verbatim in the source · title, characters 0–7

Title

Soybean Chlorosis from Heavy Fertilization¹

J. B. Weber; A. C. Caldwell Agronomy Journal 1962. doi:10.2134/agronj1962.00021962005400050016x

Other claims from this paper (5)

Intervention effect Heavy concentrated superphosphate alone caused chlorotic soybean plants.
Intervention effect Heavy concentrated superphosphate with KCl caused chlorotic soybean plants.
Observation Potassium appeared limiting for plants receiving high phosphorus rates.
Observation Manganese appeared limiting for plants receiving high rates of both phosphorus and potassium.
Intervention effect Manganese chelates slightly increased yield with high phosphorus and potassium rates.

Mechanismauthor interpretationoriginal resultmeasured

Claim · model-written summary

The lower yield in Betzes and Hannchen was mainly attributed to fewer seeds per spike.

Taxon: BARLEYHordeum vulgaret0
Outcome: decrease in number of seeds per spikee0
Qualifier: due mainly toe0

Verbatim

e0
“were due mainly to a decrease in number of seeds per spike”
✓ located verbatim in the source · abstract, characters 443–501

t0
“BARLEY”
✓ located verbatim in the source · title, characters 12–18

Title

REACTION OF BARLEY VARIETIES TO SOIL WATER STRESS

S. A. Wells; S. Dubetz Canadian Journal of Plant Science 1966. doi:10.4141/cjps66-085

Other claims from this paper (9)

Intervention effect Stress affected grain yield more at early boot than soft dough, and more at soft dough than tillering or ripening.
Intervention effect Stress affected protein content more at early boot than soft dough, and more at soft dough than tillering or ripening.
Intervention effect Early boot stress lowered yield in Betzes and Hannchen.
Intervention effect Early boot stress increased protein content in Betzes and Hannchen.
Observation Compana yield was not appreciably affected.
Observation Compana protein content was not appreciably affected.
Observation Water used per grain produced was essentially the same across varieties.
Observation Water used per grain produced was higher on Cavendish than Lethbridge soil.
Association Water used per grain produced was directly related to stress stage.

Associationobservedoriginal resultmeasured

Claim · model-written summary

Increase in oil percentage was negatively correlated with decrease in hull percentage (r = -0.86) in safflower.

Taxon: SafflowerCarthamus tinctoriust0
Outcome: hull percentagee1
Direction: negatively correlatede1
Value: r= —0.86e1
Comparator: increase in oil percentagee1

Verbatim

t0
“Effects of Degree and Time of Defoliation on Yield and Related Attributes of Safflower”
✓ located verbatim in the source · title, characters 0–86

e1
“The increase in oil percentage was negatively correlated with the decrease in hull percentage (r= —0.86)”
✓ located verbatim in the source · abstract, characters 424–528

Title

Effects of Degree and Time of Defoliation on Yield and Related Attributes of Safflower¹

A. L. Urie; L. N. Leininger; D. E. Zimmer Crop Science 1968. doi:10.2135/cropsci1968.0011183x000800060032x

Other claims from this paper (9)

Intervention effect Removal of all leaves reduced safflower yield by 23.0% relative to the check plot.
Intervention effect Removal of all leaves reduced weight per 100 seeds by 7.7% relative to the check plot.
Intervention effect Removal of all leaves reduced test weight by 2.6% relative to the check plot.
Intervention effect Removal of all leaves reduced hull percentage by 6.0% relative to the check plot.
Intervention effect Removal of all leaves increased oil by 6.9% relative to the check plot.
Intervention effect Removal of leaves from the top half of the plant had a similar but slighter effect than removal of all leaves.
Intervention effect Removal of branches from the bottom half of the plant reduced yield at the later stages of plant development.
Intervention effect Removal of leaves from the bottom half of the plant, regardless of growth stage, did not affect the attributes measured.
Observation Safflower entries differed in their response to the severe defoliation treatments.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Iron application decreased panicle numbers to a lesser extent than yield

Taxon: Rice PlantOryza sativat0
Treatment: iron applicatione1
Outcome: panicle numberse2
Direction: decreasee2

Not reportedComparator

Verbatim

t0
“Iron on Rice Plant”
✓ located verbatim in the source · title, characters 24–42

e1
“Lowering of yield due to iron application”
✓ located verbatim in the source · abstract, characters 1270–1311

e2
“to less extent, the decrease in panicle numbers”
✓ located verbatim in the source · abstract, characters 1451–1498

Title

Physiological Effect of Iron on Rice Plant : (I) Effect of iron in relation to soil reduction

Yasuo OTA; Noboru YAMADA Japanese Journal of Crop Science 1960. doi:10.1626/jcs.28.367

Other claims from this paper (11)

Observation Soil Eh was highest in upland control soil and lowest in paddy land reductive soil
Observation Free iron content in soil was the reverse of the soil Eh order
Observation Growth and yield of rice followed the same soil order as soil Eh, highest in upland control soil
Intervention effect Almost all rice plants died when iron was applied to paddy land reductive soil
Association Yield lowering caused by iron application was more marked in soil with lower Eh
Mechanism Yield lowering under iron application is attributed to retarded ripening
Intervention effect Nitrogen and potassium content of rice plants rose with iron application
Mechanism The rise in nitrogen and potassium content is merely a direct result of growth retardation
Intervention effect Phosphate content of rice plants was significantly reduced by iron application, especially in more reductive soil
Intervention effect Translocation of phosphate in rice plants was retarded by iron application, particularly in reductive soil
Association Absorption of silica and potassium by rice is influenced by excessive iron in soil

Intervention effectobservedoriginal resultpositivemeasured

Claim · model-written summary

Late sowing reduced paddy-rice grain yield less than upland-rice yield at 20 cm spacing.

Taxon: paddy ricee0
Treatment: late sowinge0
Outcome: grain yielde0
Direction: decreasee0
Comparator: upland ricee0

Verbatim

e0
“In the case of 20 cm row spacing, the grain yield decrease of paddy rice caused by late sowing was less than that of upland rice.”
✓ located verbatim in the source · abstract, characters 1075–1204

Title

Paddy Rice Growing in Upland Field : The adaptability to row spacing and sowing date

Shinichi HASEGAWA; Giichi TAKEMURA; Kanenori NAKAYAMA Japanese Journal of Crop Science 1960. doi:10.1626/jcs.29.19

Other claims from this paper (14)

Intervention effect At early sowing, 20 cm spacing raised paddy-rice grain yield about 20 per cent versus 60 cm.
Intervention effect At early sowing, 20 cm spacing raised upland-rice yield by 0∼10 percent versus 60 cm.
Observation Under 20 cm spacing paddy-rice yields exceeded upland rice except Norin No. 1.
Intervention effect Closer spacing increased paddy-rice ears and straw weight per unit area.
Intervention effect Average weight per ear decreased less in paddy than upland rice with closer spacing.
Observation At late sowing, paddy-rice yield was much higher than upland-rice yield.
Intervention effect Late sowing reduced paddy-rice ear weight and grain-to-straw ratio less than upland rice.
Observation Upland rice had a higher leaf-blade-to-sheath ratio than paddy rice.
Observation At usual spacing, upland-rice leaf blades were larger than paddy-rice blades.
Intervention effect Close spacing reduced upland-rice blade size to about paddy-rice size.
Intervention effect Close spacing left upland-rice blade-to-sheath ratio high.
Intervention effect Late sowing raised the upland-rice blade-to-sheath ratio.
Intervention effect Late sowing and close spacing markedly reduced upland-rice leaf-sheath weight.
Mechanism The authors attribute lower late-sown upland-rice yield to low stored carbohydrates and low post-heading photosynthesis.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

In the fifth cycle of Iowa Ideal, yield decreased in the one-year test.

Taxon: MaizeZea mayst0
Material: Iowa Ideale6
Treatment: fifth cyclee6
Outcome: yielde6
Direction: decreasee6
Qualifier: 1 year's teste6

Not reportedComparator

Verbatim

t0
“Mass Selection for Yield in Two Varieties of Maize”
✓ located verbatim in the source · title, characters 0–50

e6
“In the fifth cycle of Iowa Ideal, a decrease in yield was observed in the 1 year's test”
✓ located verbatim in the source · abstract, characters 1049–1136

Title

Mass Selection for Yield in Two Varieties of Maize¹

Arnel R. Hallauer; J. H. Sears Crop Science 1969. doi:10.2135/cropsci1969.0011183x000900010016x

Other claims from this paper (9)

Intervention effect Mass selection did not significantly improve yield in the Krug variety.
Intervention effect Mass selection did not significantly improve yield in the Iowa Ideal variety.
Association Across successive cycles of selection, yield showed a small average increase.
Association The regression coefficient of yield on selection cycles in Krug did not differ from zero.
Association The regression coefficient of yield on selection cycles in Iowa Ideal did not differ from zero.
Intervention effect Four years of testing showed no yield increase in Krug after three cycles of selection.
Intervention effect A 5% yield gain was obtained in Iowa Ideal after three cycles of selection.
Intervention effect Only a 3% yield gain was noted in Krug after six cycles of selection in a one-year test.
Observation Average yields across the original and successive selection cycles were erratic.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

Summer depression on c-soil decreased subsequent-season legume yield.

Taxon: Ladino clover, Red clovert0
Outcome: yielde0
Direction: decreasee0
Qualifier: summer depressione0
Setting: c-soile0

Verbatim

e0
“Legumes on c-soil severely suffered from summer depression, which caused the decrease of yield in the subsequent growing season.”
✓ located verbatim in the source · abstract, characters 302–430

t0
“Ladino clover, Red clover”
✓ located verbatim in the source · title, characters 47–72

Title

Effect of Two Different soils on the Growth of Ladino clover, Red clover and Orchard grass.

Sukeo KAWANASE; Toyoichi YAMADA; Masahiko UENO Japanese Journal of Crop Science 1960. doi:10.1626/jcs.29.175

Other claims from this paper (6)

Intervention effect All three species were more productive on m-soil than c-soil.
Observation Legumes on c-soil suffered severe summer depression.
Intervention effect Legume root weight was greater on m-soil than c-soil.
Intervention effect Legume root respiration was higher on m-soil than c-soil.
Intervention effect Legume roots decayed slowly on m-soil relative to c-soil.
Intervention effect Orchard grass formed sod-bound on c-soil but not m-soil.

Intervention effectobservedoriginal resultno effectmeasured

Claim · model-written summary

Those insecticide treatments did not alter seed set or yield.

Taxon: OnionAllium cepat0
Treatment: These treatmentse0
Outcome: seed set or yielde0
Direction: did not increase or decreasee0

Not reportedComparator

Verbatim

e0
“These treatments did not increase or decrease seed set or yield but the use of parathion indicated some increase in seed viability.”
✓ located verbatim in the source · abstract, characters 1375–1506

t0
“Flower Thrips on Onion”
✓ located verbatim in the source · title, characters 10–32

Title

Effect of Flower Thrips on Onion Seed Plants and a Study of Their Control

Elmer C. Carlson Journal of Economic Entomology 1964. doi:10.1093/jee/57.5.735

Other claims from this paper (17)

Observation Flower thrips feeding injures flower filaments and causes premature pollen loss and reduced pollination and seed set.
Observation About 10 thrips per flower or floret were needed for meaningful injury.
Observation An estimated 9,000 to 10,000 thrips per seed head would be needed for economic injury and seed loss.
Observation Observed infestations reached 1900, 2400 and 3600 thrips per head.
Observation These thrips densities did not reduce onion seed set, yield, size or viability.
Intervention effect Thrips increased pollination and seed set over controls in every experiment.
Intervention effect Adding pollinators increased seed production and viability relative to thrips alone.
Observation Fly pollinators and two heads per replicate cage were needed for adequate seed set.
Observation Across three years, thrips density never caused economic onion seed loss.
Intervention effect Two or three parathion applications satisfactorily controlled thrips.
Intervention effect Two or three diazinon applications satisfactorily controlled thrips.
Intervention effect Parathion appeared to increase seed viability somewhat.
Intervention effect Parathion during bloom reduced bee and fly pollinators for about three days.
Intervention effect One prebloom dimethoate application gave outstanding thrips control.
Intervention effect The single prebloom dimethoate application did not reduce pollinators.
Intervention effect An additional bloom dimethoate application reduced pollinators for up to ten days.
Intervention effect The single dimethoate application increased seed set and yield.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

At highest liming, B at 40 pounds or more per acre decreased oat yield.

Taxon: OATSAvena sativat0
Treatment: B application of 40 pounds or more per acree0
Outcome: yielde0
Direction: decreasee0
Qualifier: highest liming ratee0

Not reportedComparator

Verbatim

e0
“At the highest liming rate a decrease in yield resulted with a B application of 40 pounds or more per acre.”
✓ located verbatim in the source · abstract, characters 533–640

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

Title

TRACE ELEMENT EFFECTS ON OATS AND ALFALFA GROWN ON THREE SOILS

F. W. Calder; W. M. Langille Canadian Journal of Plant Science 1963. doi:10.4141/cjps63-099

Other claims from this paper (5)

Observation Oats were more sensitive to excess B than alfalfa.
Intervention effect Oat yield declined with rising B rates in unlimed and pH 6.2 soil.
Intervention effect B at 60 pounds per acre did not reduce alfalfa yield.
Intervention effect B at 100 pounds per acre significantly reduced alfalfa yield.
Observation Leaf chlorosis indicating toxicity was greater at low pH.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

Yield decline was mainly attributable to heads per square metre.

Taxon: wheat cropTriticum aestivumt0
Outcome: decreasee0
Qualifier: differences in the number of heads per sq metree0

Verbatim

e0
“The decrease was due mainly to differences in the number of heads per sq metre”
✓ located verbatim in the source · abstract, characters 964–1042

t0
“wheat crop”
✓ located verbatim in the source · title, characters 98–108

Title

An analysis of the effects of nitrogen deficiency on the growth and yield of a Western Australian wheat crop

NJ Halse; EAN Greenwood; P Lapins; et al. Australian Journal of Agricultural Research 1969. doi:10.1071/ar9690987

Other claims from this paper (15)

Observation Relative growth rate generally declined over time.
Intervention effect Early-season relative growth rate ranked N2 above N1 and N0.
Observation Deficient plants recovered rapidly in August.
Association Recovery was associated with second tiller emergence, greater net assimilation and nitrogen uptake, and lower nitrogen stress.
Mechanism There was no evidence that greater soil nitrogen mineralization caused recovery.
Observation Nitrogen stress under N0 fell from 48% in July to 14% in September.
Observation Stress under N1 rose from 6 to 23% in July before falling to 5% in September.
Intervention effect N0 delayed flower initiation 14 days compared with N1.
Intervention effect N0 delayed ear emergence 8 days relative to N1.
Intervention effect N0 grain yield was 30% of N2 grain yield.
Intervention effect N1 grain yield was 60% of N2 grain yield.
Intervention effect Nitrogen deficiency reduced grains per head.
Intervention effect Nitrogen deficiency reduced weight per grain.
Intervention effect Nitrogen treatments did not affect duration of photosynthetic activity after anthesis.
Intervention effect Harvest index was highest under N0 and similar under N1 and N2.

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“yield decrease”

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