Search claims · PlantClaims

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing ethephon rate linearly decreased harvestable grain yield except at ear elongation in 1986.

Taxon: cornZea mays subsp. mayse1
Treatment: Increasing the rate of ethephone0
Outcome: harvestable grain yielde0
Direction: linear decreasee0
Qualifier: except when applied at the EE stage in 1986e0

Not reportedComparator

Verbatim

e0
“Increasing the rate of ethephon resulted in a linear decrease in harvestable grain yield, except when applied at the EE stage in 1986, when ethephon application had no influence”
✓ located verbatim in the source · abstract, characters 883–1060

e1
“corn ( Zea mays L.)”
✓ located verbatim in the source · abstract, characters 265–284

Title

Ethephon Influence on Harvestable Yield, Grain Quality, and Lodging of Corn

O. S. Norberg; S. C. Mason; S. R. Lowry Agronomy Journal 1988. doi:10.2134/agronj1988.00021962008000050015x

Other claims from this paper (10)

Intervention effect Ethephon reduced lodging of corn.
Intervention effect At ear elongation, 0.56 kg ha −1 ethephon reduced lodging in P3377 and P3183 from 30 to 9%.
Intervention effect This ethephon rate produced 52 fewer kernels per ear.
Intervention effect This ethephon rate reduced kernel weight by 7 to 17 mg.
Intervention effect This ethephon rate increased harvestable ears by 0.2 to 0.6 ears m −2.
Intervention effect At ear elongation in 1986, ethephon had no influence on grain yield.
Intervention effect At ear elongation in 1986, increasing ethephon rate increased harvestable ears per square meter.
Intervention effect Specified 0.56 kg ha −1 ethephon timings reduced harvestable grain yield by about 1 Mg ha −1.
Intervention effect Ethephon significantly affected grain protein content, kernel density, and breakage susceptibility, with small effects.
Recommendation The authors found little incentive to apply ethephon to corn under similar conditions.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

The yield decrease was attributed to fewer pods per plant.

Taxon: soybeanGlycine maxe1
Treatment: simulated acidic raine1
Outcome: number of pods per plante0
Direction: decreasee0
Comparator: Control plotse1

Verbatim

e0
“Decreased yields were attributed to a decrease in number of pods per plant since seed number per pod and mass per seed did not vary among the treatments”
✓ located verbatim in the source · abstract, characters 1026–1178

e1
“seeds of soybean plants exposed to simulated acidic rain grown under standard agronomic practices and receiving ambient rainfall at Brookhaven National Laboratory during the summer of 1979. Plots were exposed three times per week to simulated rainfalls of pH 4·0, 3·1, 2·7 or 2·3 to provide inputs of 50, 397, 998 or 2506 μequiv. of hydrogen ions respectively, above ambient levels throughout the growing season. Control…” Show full quote
✓ located verbatim in the source · abstract, characters 110–579

Title

SEED YIELDS (QUANTITY AND QUALITY) OF FIELD‐GROWN SOYBEANS EXPOSED TO SIMULATED ACIDIC RAIN

LANCE S. EVANS; KEITH F. LEWIN; CHRISTINE A. CONWAY; et al. New Phytologist 1981. doi:10.1111/j.1469-8137.1981.tb02327.x

Other claims from this paper (9)

Intervention effect Seed yield decreased 2·6% under the first acid-rain level.
Intervention effect Seed yield decreased 6·5% under the second acid-rain level.
Intervention effect Seed yield decreased 11·4% under the third acid-rain level.
Intervention effect Seed yield decreased 8·5% under the fourth acid-rain level.
Intervention effect Hydrogen ion concentration and seed yield followed a negative treatment-response relation.
Intervention effect Seed number per pod and mass per seed did not vary across treatments.
Intervention effect Total seed protein per plant decreased 10% at pH 4·0.
Intervention effect Total seed protein per plant decreased 19% at pH 3·1.
Intervention effect Total non-structural carbohydrates did not decrease significantly at those treatment levels.

Observationobservedoriginal resultmeasured

Claim · model-written summary

Instantaneous fluorescence yield began decreasing near CO2 uptake saturation.

Taxon: Hedera helixHedera helixe1
Outcome: yield of instantaneous fluorescencee0
Direction: decreasee0

Verbatim

e0
“This was also the point from which the yield of instantaneous fluorescence began to decrease.”
✓ located verbatim in the source · abstract, characters 1319–1412

e1
“Intact attached sun leaves of Helianthus annuus and shade leaves of Monstera deliciosa and Hedera helix were used to obtain light response curves”
✓ located verbatim in the source · abstract, characters 0–145

Title

Light Response of CO₂ Assimilation, Dissipation of Excess Excitation Energy, and Zeaxanthin Content of Sun and Shade Leaves

Barbara Demmig-Adams; Klaus Winter; Almuth Krüger; et al. PLANT PHYSIOLOGY 1989. doi:10.1104/pp.90.3.881

Other claims from this paper (9)

Associationobservedoriginal resultmeasured

Claim · model-written summary

Carryover tended to lower the fertilizer level needed for plateau yield.

Taxon: Rhodes grass, Chloris gayana Kunthe1
Treatment: fertilizatione0
Outcome: minimum levels of fertilization required to attain the plateau yielde0
Direction: decreasee0
Qualifier: carryover effecte0

Verbatim

e0
“The estimated minimum levels of fertilization required to attain the plateau yield showed a tendency to decrease as a result of the carryover effect.”
✓ located verbatim in the source · abstract, characters 2164–2313

e1
“three cuts of Rhodes grass, Chloris gayana Kunth”
✓ located verbatim in the source · abstract, characters 473–521

Title

Spline Response Functions for Direct and Carry‐over Effects Involving a Single Nutrient

Mario A. Jauregui; Quirino Paris Soil Science Society of America Journal 1985. doi:10.2136/sssaj1985.03615995004900010028x

Other claims from this paper (12)

Method / resource LQP and PQL often collapsed into LRP and PLR fits without a quadratic domain.
Method / resource Spline functions performed at least as well as a quadratic polynomial and sometimes improved fit.
Method / resource Polynomial responses tend to overestimate optimal fertilizer rate.
Method / resource LRP and LQP models are considered better suited to realistic fertilizer optima.
Association The carry-over effect on yield had R 2 = 0.58 within a growth season.
Association The carry-over effect on yield had R 2 = 0.38 between seasons.
Method / resource PLR explained 90 % of variability in residual soil N.
Method / resource PQL explained 90 % of variability in residual soil N.
Observation Estimated fertilizer dose to attain plateau yield was 430 for a cut of the first season.
Observation Estimated fertilizer dose to attain plateau yield was 250 kg N ha −1 for a cut of the first season.
Observation Estimated fertilizer dose to attain plateau yield was 223 kg N ha −1 for a cut of the second season.
Method / resource The spline procedure provides continuity for LRP and obtains knots by maximizing goodness of fit.

Mechanismobservedoriginal resultnegativemeasured

Claim · model-written summary

Increasing potassium rates may lower corn yield when nitrogen limits growth because of competition for uptake.

Taxon: CornZea mays subsp. mayst0
Treatment: increasing K ratese0
Outcome: yieldse0
Direction: decreasee0
Qualifier: if N is a limiting factore0

Verbatim

e0
“increasing K rates may decrease yields if N is a limiting factor, due to a competition for uptake.”
✓ located verbatim in the source · abstract, characters 1709–1807

t0
“Corn”
✓ located verbatim in the source · title, characters 82–86

Title

Effects of Increasing the Rates of Potassium and Nitrapyrin on Nitrogen Uptake by Corn¹

M. A. Lueking; J. W. Johnson; F. L. Himes Agronomy Journal 1983. doi:10.2134/agronj1983.00021962007500020021x

Other claims from this paper (6)

Intervention effect Nitrapyrin kept soil ammonium higher than checks for four to six weeks.
Intervention effect Increasing potassium rates decreased corn yields.
Intervention effect Increasing potassium rates decreased total nitrogen percentage in leaves 6 through 10 at 12 weeks.
Intervention effect Potassium and nitrapyrin rates did not affect total grain nitrogen.
Observation Total grain nitrogen was 0.95%, indicating deficiency across treatments.
Intervention effect Calcium, magnesium, copper and phosphorus concentrations declined as potassium rate increased.

Mechanismauthor interpretationoriginal resultnegativemeasured

Claim · model-written summary

The decrease in photosynthetic rate of Engelmann spruce seedlings was caused primarily by nonstomatal limitations.

Taxon: Engelmann sprucePicea engelmanniie0
Outcome: photosynthetic ratee3
Qualifier: caused primarily by nonstomatal limitationse3

Verbatim

e0
“potted Engelmann spruce (Picea engelmannii Parry ex Engelm.) seedlings”
✓ located verbatim in the source · abstract, characters 113–183

e3
“Low root temperature also caused a decrease in photosynthetic utilization of internal CO(2), carboxylation efficiency and apparent quantum yield, and it was concluded that the decrease in photosynthetic rate was caused primarily by nonstomatal limitations”
✓ located verbatim in the source · abstract, characters 542–797

Title

Effect of low root temperature on net photosynthesis, stomatal conductance and carbohydrate concentration in Engelmann spruce (Picea engelmannii Parry ex Engelm.) seedlings

E. H. Delucia Tree Physiology 1986. doi:10.1093/treephys/2.1-2-3.143

Other claims from this paper (8)

Intervention effect Root temperature between 10 and 20 degrees C had no effect on net photosynthesis of Engelmann spruce seedlings.
Intervention effect Below 8 degrees C root temperature, conductance and photosynthesis declined sharply in Engelmann spruce seedlings.
Intervention effect Net photosynthesis decreased to 50% of the initial value after 7 days at 0.7 degrees C root temperature.
Intervention effect Stomatal conductance decreased to 34% of the initial value after 7 days at 0.7 degrees C root temperature.
Intervention effect Low root temperature decreased photosynthetic utilization of internal CO2, carboxylation efficiency and apparent quantum yield.
Intervention effect Root chilling caused a small increase in starch content in needles and stems of Engelmann spruce seedlings.
Intervention effect Root chilling induced hydrolysis of starch to glucose in roots, increasing glucose.
Mechanism Increased glucose may enable continued root growth of Engelmann spruce seedlings at low temperatures.

Mechanismhypothesisoriginal resultmeasured

Claim · model-written summary

The authors proposed that chilling shifts transport toward cyclic electron flow, accounting for reduced quantum yield.

Taxon: Zea maysZea mayst0
Outcome: decrease in the apparent quantum yield of photosynthetic oxygen evolutione0
Qualifier: enhancement of cyclic over non-cyclic electron transporte0

Verbatim

e0
“These chill-induced changes would result in an enhancement of cyclic over non-cyclic electron transport and account for a decrease in the apparent quantum yield of photosynthetic oxygen evolution”
✓ located verbatim in the source · abstract, characters 671–866

t0
“Zea mays”
✓ located verbatim in the source · title, characters 43–51

Title

Chilling Damage to Photosynthesis in Young Zea mays

N. R. BAKER; T. M. EAST; S. P. LONG Journal of Experimental Botany 1983. doi:10.1093/jxb/34.2.189

Other claims from this paper (3)

Intervention effect Chilled leaves showed a 45% lower apparent quantum yield of photosynthetic oxygen evolution after warming.
Intervention effect Chilling reduced primary photochemical quantum yield of photosystem II by 20–25%.
Observation Chilling markedly modified excitation energy distribution, excessively favouring photosystem I over II.

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

ABA reduced the quantum yield of oxygen evolution in sunflower leaves in proportion to the light-saturated rate.

Taxon: sunflowerHelianthus annuuse0
Treatment: ABA-treatede0
Outcome: quantum yield of oxygen evolutione0
Direction: decreasede0
Qualifier: in proportion to the decrease in the light-saturated ratee0

Not reportedComparator

Verbatim

e0
“The quantum yield of oxygen evolution decreased in ABA-treated sunflower leaves in proportion to the decrease in the light-saturated rate”
✓ located verbatim in the source · abstract, characters 830–967

Title

Stomatal Limitation of Photosynthesis in Abscisic Acid-Treated and in Water-Stressed Leaves Measured at Elevated CO2

SP Robinson; WJR Grant; BR Loveys Australian Journal of Plant Physiology 1988. doi:10.1071/pp9880495

Other claims from this paper (19)

Intervention effect ABA reduced stomatal conductance and assimilation in apricot leaves.
Intervention effect ABA reduced stomatal conductance and assimilation in sunflower leaves.
Intervention effect ABA did not change calculated intercellular CO2 concentration in apricot leaves.
Intervention effect ABA did not change calculated intercellular CO2 concentration in sunflower leaves.
Observation Non-stomatal inhibition evidence was absent in spinach.
Intervention effect ABA did not significantly decrease electron transport rates in sunflower chloroplasts.
Intervention effect ABA did not significantly decrease Rubisco activity in sunflower chloroplasts.
Intervention effect ABA inhibited oxygen evolution in sunflower leaf discs at 3% CO2.
Intervention effect ABA inhibited oxygen evolution in apricot leaf discs at 3% CO2.
Intervention effect ABA did not inhibit oxygen evolution in spinach leaf discs at 3% CO2.
Observation ABA inhibition of oxygen evolution at 3% CO2 was half the inhibition of assimilation at ambient CO2 in sunflower and apricot leaves.
Intervention effect ABA did not produce a significant difference in room-temperature chlorophyll fluorescence.
Intervention effect Raising CO2 from 340 to 1000 ppm reduced sunflower stomatal conductance by over 90%.
Observation Sunflower stomata appeared to reopen at much higher CO2 concentrations.
Intervention effect Sunflower stomatal conductance at 2-3% CO2 was 50% of ambient-CO2 conductance.
Observation Prior water stress or ABA inhibited stomatal reopening at high CO2.
Observation Maximum oxygen evolution occurred at 0.5-2% CO2 in unstressed leaves.
Observation ABA-treated leaves required 10-15% CO2 for maximum oxygen evolution.
Mechanism ABA inhibition of photosynthesis was largely overcome at saturating CO2; the authors propose patchy stomatal closure as an explanation.

Associationobservedoriginal resultnegativemeasured

Claim · model-written summary

In late July to early September, N addition and N uptake caused the greatest decrease in sucrose accumulation and production at harvest.

Taxon: SugarbeetBeta vulgaris subsp. vulgarise0
Treatment: addition of N and N uptake by the plante3
Outcome: sucrose accumulation and production at harveste3
Direction: greatest decreasee3
Qualifier: during this periode3

Verbatim

e0
“Sugarbeet ( Beta vulgaris L.) root quality has been steadily decreasing”
✓ located verbatim in the source · abstract, characters 9–80

e3
“during this period, addition of N and N uptake by the plant caused the greatest decrease in sucrose accumulation and production at harvest”
✓ located verbatim in the source · abstract, characters 1240–1378

Title

Effect of Time and Amount of Nitrogen Uptake on Sugarbeet Growth and Yield¹

J. N. Carter; D. J. Traveller Agronomy Journal 1981. doi:10.2134/agronj1981.00021962007300040023x

Other claims from this paper (12)

Intervention effectobservedoriginal resultnegativemeasured

Claim · model-written summary

Cotton yield was 11% lower at 1982 Raleigh ozone levels than in filtered air chambers.

Taxon: cottonGossypium hirsutume0
Treatment: levels of O 3 that occurred during the 1982 season at Raleigh, NCe0
Outcome: cotton yielde0
Direction: decreasee0
Value: 11%e0
Comparator: charcoal‐filtered‐air chamberse0
Setting: Raleigh, NCe0

Verbatim

e0
“Compared to cotton yield in charcoal‐filtered‐air chambers, the measured decrease of cotton yield at levels of O 3 that occurred during the 1982 season at Raleigh, NC was 11%”
✓ located verbatim in the source · abstract, characters 1073–1247

Title

Injury and Yield Response of Cotton to Chronic Doses of Ozone and Sulfur Dioxide

Allen S. Heagle; W. W. Heck; V. M. Lesser; et al. Journal of Environmental Quality 1986. doi:10.2134/jeq1986.00472425001500040011x

Other claims from this paper (4)

Intervention effect Stoneville 213 yield decreased under ozone exposure.
Method / resource Regression analyses described the ozone and yield relationship.
Intervention effect Sulfur dioxide doses above regional levels had no significant effect on cotton.
Intervention effect Sulfur dioxide did not significantly alter cotton response to ozone.

“yield decrease”

Claim types

Direction of the findings

Over time

Claim type

Research area

Polarity

Statistics