drought · Yield · Vigna unguiculata (cowpea)
77 claims from these papers; 10 citations between them.
Papers whose results differ, checked claim by claim 13
13 pairs of papers on this question report results that differ: an effect in one paper, the opposite effect or no effect in the other. Two model reviewers reading both claims accepted each pair.
- Drought Adaptation of Cowpea. I. Influence of Drought on Seed Yield1 (1980)
decreaseFlowering-stage drought substantially reduced yield.
Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Drought Response of Grain Legumes Under Irrigation Gradient: I. Yield and Yield Components1 (1984)
decreaseDrought reduced seed yield of cowpea.
Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Water Deficit Effects on Water Potential, Yield, and Water Use of Cowpeas1 (1981)
decreaseDrought at flowering reduced cowpea yield by 35 to 69%.
Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Effect of Salicylic Acid Seed Priming on Some Physiological Traits of Cowpea (Vigna unguiculata L.) Under Water Deficit at Podding Stage (2010)decreaseWater deficit reduced seed yield compared with normal irrigation.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Effect of water stress applied at different stages of growth on seed yield and water-use efficiency of cowpea. (2010)decreaseReproductive-stage water deficit reduced seed yield by at least 50% across three genotypes.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Assessment of cowpea genotypes for variability to drought tolerance. (2011)decreaseDrought stress reduced cowpea yields.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
Show 7 more pairs
- Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Genetic Analysis of Vegetative-Stage Drought Tolerance in Cowpea (2013)decreaseMoisture stress reduced grain yield in cowpea.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Genetic Analysis of Vegetative-Stage Drought Tolerance in Cowpea (2013)decreaseMoisture stress significantly reduced cowpea grain yield.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Cowpea Yield Under Water Stress Scenarios (2023)decreaseWater stress reduced grain yield regardless of season.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Screen House Assessment of Cowpea [(Vigna unguiculata (L.)] Genotypes for Drought Tolerance Using Selection Indices (2023)decreaseAverage grain yield reduction under artificial drought relative to well-watered condition was 60.6%.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Economic indicators for cowpea cultivation under different irrigation depths (2023)decreaseWater deficit limited cowpea yield in both years.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Effect of drought at different reproductive stages on yield and yield components of some cowpea (Vigna unguiculata l. Walp) varieties in Lapai, Niger State, Nigeria (2024)decreaseWater stress at early seed filling significantly reduced grain yield per plot and per hectare.
The records name no dose, test system or situation that separates the two claims.Compare the two papers → - Nodulation and N Fixation of Field‐Grown California Cowpeas as Influenced by Well‐Irrigated and Droughted Conditions1 (1981)
no changeSeed yields of droughted cowpea plants did not decrease below those of well-watered plants despite lower nitrogen fixation capacity.
Tolerance of Cowpea (Vigna unguiculata (L.) Walp.) Genotypes to Drought Stress During Vegetative and Reproductive Stages (2025)decreaseDrought at R1 reduced seed yield 46%.
The records name no dose, test system or situation that separates the two claims.Compare the two papers →
How these papers cite each other
10 citations between these papers: 10 on the same side, 0 across the two sides.
- Positive result
- Negative result or no effect
- Citation, pointing to the cited paper
- Citation across the two sides
- Larger circle: more citations overall
Years run left to right. Citations come from the papers’ OpenAlex reference lists. Hover a paper to bring forward its citations; click it to open the paper.
Papers reporting a positive result 7
Effect of irrigation on phenology, growth and yield of cowpea (Vigna unguiculata) · 1999
- positive
- positive
- negative
- positive
- positive
- positive
- positive
- positive
- positive
Papers reporting a negative result or no effect 39
Yield of Grain Legumes as Affected by Irrigation and Fertilizer Regimes1 · 1970
- negative
Yield of Grain Legumes as Affected by Irrigation and Fertilizer Regimes1 · 1970
- negative
Drought Adaptation of Cowpea. I. Influence of Drought on Seed Yield1 · 1980
- no effect
- negative
- negative
Water Deficit Effects on Water Potential, Yield, and Water Use of Cowpeas1 · 1981
- negative
- negative
- negative
- negative
- negative
- no effect
- no effect
Drought Response of Grain Legumes Under Irrigation Gradient: I. Yield and Yield Components1 · 1984
- negative
Reproductive Abscission and Yield of Irrigated and Drought Stressed Cowpea · 1991
- negative
- no effect
- no effect
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
Assessment of cowpea genotypes for variability to drought tolerance. · 2011
- negative
Genetic Analysis of Vegetative-Stage Drought Tolerance in Cowpea · 2013
- negative
- negative
- negative
Genetic Analysis of Vegetative-Stage Drought Tolerance in Cowpea · 2013
- negative
- negative
- negative
TOLERANCE OF F 2 POPULATIONS OF COWPEA TO WATER DEFICIT · 2018
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
Assessment of Cowpea (Vigna unguiculata (L.) Walp.) Mutant Lines for Drought Tolerance · 2020
- negative
- negative
- negative
- negative
Calibration and validation of AquaCrop model for cowpea crop under water stress · 2022
- negative
- negative
Cowpea Yield Under Water Stress Scenarios · 2023
- no effect
- negative
- negative
- negative
- negative
- negative
Economic indicators for cowpea cultivation under different irrigation depths · 2023
- negative
PRE-HARVEST DESICCATION FOR PRODUCING HIGH QUALITY COWPEA SEEDS · 2023
- negative
- negative
Modulation of Drought-Induced Stress in Cowpea Genotypes Using Exogenous Salicylic Acid · 2024
- negative
- negative
- negative
- negative
- negative
- negative
- negative
- negative
Comparison of multi-stress resilience in wild and domesticated Cowpea · 2026
- negative
A paper is on the positive side when any of its claims here is positive. Claims are grouped by organism, treatment and what was measured or targeted. Claims that compare genotypes are left out; a claim about lacking a nutrient counts the other way round in that nutrient’s question. “Results differ” marks a question where two model reviewers, reading both claims, accepted at least one pair of papers whose results differ.