Abstract
In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages. Particular emphasis was given to drought effects on yield of seeds and nutrient concentrations in the seeds. Water stress during flowering and pod-filling reduced seed yield by 44 and 29 percent, respectively, when compared with yield from the control treatment. Water stress during the vegetative stage showed no significant effect on seed production by comparison with the control. The most severe seed yield reduction was found in treatment plots subjected to water stress during both flowering and pod-filling stages, which reduced seed yield by 67 percent. The differential growth-stage irrigation treatments significantly affected concentrations of nitrogen, calcium, magnesium, copper, boron, and iron in the seeds. The concentration of N in the seeds was inversely proportional to the dry-weight seed yield. There were several significant interactions between irrigation treatments and years on seed yields and concentrations of N, P, K, Ca, Mg, Zn, Mn, and Fe in the seeds.
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Claims 11
Claim · model-written summary
Water stress during flowering reduced cowpea seed yield by 44 percent compared with the control.
- Taxon
- cowpeas
Vigna unguiculatae1 - Organ / stage
- floweringe2
- Treatment
- Water stress during floweringe2
- Outcome
- seed yielde2
- Direction
- reducede2
- Value
- 44e2
- Comparator
- control treatmente2
- Setting
- University of California Agricultural Experiment Station at Riversidee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e2“Water stress during flowering and pod-filling reduced seed yield by 44 and 29 percent, respectively, when compared with yield from the control treatment”
Claim · model-written summary
Water stress during pod-filling reduced cowpea seed yield by 29 percent compared with the control.
- Taxon
- cowpeasVigna unguiculatae1
- Organ / stage
- pod-fillinge2
- Treatment
- Water stress during flowering and pod-fillinge2
- Outcome
- seed yielde2
- Direction
- reducede2
- Value
- 29 percente2
- Comparator
- control treatmente2
- Setting
- University of California Agricultural Experiment Station at Riversidee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e2“Water stress during flowering and pod-filling reduced seed yield by 44 and 29 percent, respectively, when compared with yield from the control treatment”
Claim · model-written summary
Water stress during the vegetative stage had no significant effect on cowpea seed production compared with the control.
- Taxon
- cowpeasVigna unguiculatae1
- Organ / stage
- vegetative stagee3
- Treatment
- Water stress during the vegetative stagee3
- Outcome
- seed productione3
- Direction
- no significant effecte3
- Comparator
- the controle3
- Setting
- University of California Agricultural Experiment Station at Riversidee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e3“Water stress during the vegetative stage showed no significant effect on seed production by comparison with the control”
Claim · model-written summary
Water stress during both flowering and pod-filling caused the most severe cowpea seed yield reduction, of 67 percent.
- Taxon
- cowpeasVigna unguiculatae1
- Treatment
- water stress during both flowering and pod-filling stagese4
- Outcome
- seed yielde4
- Direction
- reducede4
- Value
- 67 percente4
- Comparator
- control treatmente2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e2“Water stress during flowering and pod-filling reduced seed yield by 44 and 29 percent, respectively, when compared with yield from the control treatment”
e4“The most severe seed yield reduction was found in treatment plots subjected to water stress during both flowering and pod-filling stages, which reduced seed yield by 67 percent”
Claim · model-written summary
Growth-stage irrigation treatments significantly affected seed concentrations of nitrogen, calcium and magnesium in cowpea.
- Taxon
- cowpeasVigna unguiculatae1
- Organ / stage
- seedse5
- Treatment
- differential growth-stage irrigation treatmentse5
- Outcome
- concentrations of nitrogen, calcium, magnesiume5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e5“The differential growth-stage irrigation treatments significantly affected concentrations of nitrogen, calcium, magnesium, copper, boron, and iron in the seeds”
Claim · model-written summary
Growth-stage irrigation treatments significantly affected seed concentrations of copper, boron and iron in cowpea.
- Taxon
- cowpeasVigna unguiculatae1
- Organ / stage
- seedse5
- Treatment
- differential growth-stage irrigation treatmentse5
- Outcome
- copper, boron, and irone5
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e5“The differential growth-stage irrigation treatments significantly affected concentrations of nitrogen, calcium, magnesium, copper, boron, and iron in the seeds”
Claim · model-written summary
Seed N concentration in cowpea was inversely proportional to dry-weight seed yield.
- Taxon
- cowpeasVigna unguiculatae1
- Organ / stage
- seedse6
- Outcome
- concentration of N in the seedse6
- Direction
- inversely proportionale6
- Qualifier
- dry-weight seed yielde6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e6“The concentration of N in the seeds was inversely proportional to the dry-weight seed yield”
Claim · model-written summary
Significant interactions between irrigation treatments and years affected cowpea seed yield.
- Taxon
- cowpeasVigna unguiculatae1
- Treatment
- irrigation treatmentse7
- Outcome
- seed yieldse7
- Qualifier
- between irrigation treatments and yearse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e7“There were several significant interactions between irrigation treatments and years on seed yields and concentrations of N, P, K, Ca, Mg, Zn, Mn, and Fe in the seeds”
Claim · model-written summary
Significant interactions between irrigation treatments and years affected seed concentrations of N, P and K in cowpea.
- Taxon
- cowpeasVigna unguiculatae1
- Treatment
- irrigation treatmentse7
- Outcome
- concentrations of N, P, Ke7
- Qualifier
- between irrigation treatments and yearse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e7“There were several significant interactions between irrigation treatments and years on seed yields and concentrations of N, P, K, Ca, Mg, Zn, Mn, and Fe in the seeds”
Claim · model-written summary
Significant interactions between irrigation treatments and years affected seed concentrations of Ca, Mg and Zn in cowpea.
- Taxon
- cowpeasVigna unguiculatae1
- Treatment
- irrigation treatmentse7
- Outcome
- Ca, Mg, Zne7
- Qualifier
- between irrigation treatments and yearse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e7“There were several significant interactions between irrigation treatments and years on seed yields and concentrations of N, P, K, Ca, Mg, Zn, Mn, and Fe in the seeds”
Claim · model-written summary
Significant interactions between irrigation treatments and years affected seed concentrations of Mn and Fe in cowpea.
- Taxon
- cowpeasVigna unguiculatae1
- Treatment
- irrigation treatmentse7
- Outcome
- Mn, and Fee7
- Qualifier
- between irrigation treatments and yearse7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In 1976 and 1977, we conducted experiments at the University of California Agricultural Experiment Station at Riverside to evaluate drought effects on cowpeas during the vegetative, flowering, and pod-filling growth stages”
e7“There were several significant interactions between irrigation treatments and years on seed yields and concentrations of N, P, K, Ca, Mg, Zn, Mn, and Fe in the seeds”
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