fertilization · Physiology: pigments · Vigna unguiculata (cowpea)

Positive and negative results25 papers: 23 positive, 2 negative or no effect

27 claims from these papers; 1 citation between them.

Papers here report positive and negative or no-effect results. No pair of them has been accepted in the claim-by-claim check.

How these papers cite each other

1 citation between these papers: 1 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 23

Effect of benzyl amino purine (BAP), coconut milk (CM) and manure applications on leaf senescence and yield in photoperiod sensitive cowpea variety (Kanannado). · 2009
- positive
  All treatments increased chlorophyll level in cowpea.
  compared with all the treatments
- positive
  Combined manure with 15% coconut milk or 200 ppm BAP increased chlorophyll above manure and control plants in cowpea.
  compared with manure and control plants
ISOLATION OF IDENTIFICATION OF KLIBSILLA OXYTOCA FROM RAMADI SOIL AND DETERMINE ITS ABILITY TO NITROGEN FERTILIZER RECOMMENDED FOR COWPEA PLANT · 2010
- positive
  The bacterial isolate with quarter-rate fertilizer improved the studied cowpea plant traits.
Effects of Brewer's Spent Grains-typed Bio-organic Fertilizer on Cowpea Photosynthesis Characteristics · 2011
- positive
  Brewer spent grain fertilizer improved functional leaf chlorophyll content.
Influence of organic nutrient sources on growth, seed yield and economics of cowpea under mid hills of Arunachal Pradesh · 2013
- positive
  SPAD value and solar radiation interception at the middle and bottom of the canopy were higher where vermicompost or poultry manure was applied.
Effect of liquid bio-nutrients in conjuction with inorganicfertilizers on yield, quality and nutrient uptake bysummer cowpea [Vigna unguiculata (L.) Walp.] · 2014
- positive
  Combined bio-nutrient treatment increased chlorophyll index of cowpea leaves.
Effect of fertility levels and biofertilizers on growth and yield of cowpea on sandy loam soil of Rajasthan · 2015
- positive
  100 per cent RDF+VC @ 2 t/ha significantly increased chlorophyll content over control and was at par with 75 per cent RDF+VC @ 2 t/ha.
  compared with control
Effect of organic manures on soil and quality parameters of cowpea[Vigna unguiculata (L.) Walp] under middle Gujarat conditions · 2016
- positive
  Recommended fertilizer gave higher cowpea leaf chlorophyll than most other treatments.
  compared with rest of the treatments except, vermicompost 2 t ha-1 and poultry manure 2 t ha-1
Effect of Different Levels of NPK Fertilizers with the Foliar Application of Iron, Zinc and Boron on Vegetative Growth and Yield of Cowpea · 2016
- positive
  Increasing NPK significantly increased cowpea leaf area and chlorophyll b content.
MAXIMIZE UTILIZATION OF SOME ORGANIC FERTILIZERS TO PRODUCE THE HIGHEST YIELD OF COWPEA. · 2019
- positive
  Compost rice straw increased cowpea leaf chlorophyll contents.
Growth, yield and biochemical responses of cowpea (Vigna unguiculata) to fish silage enriched vermicompost · 2019
- positive
  Inorganic fertiliser gave higher cowpea carotenoid than organic manure.
  compared with organic manure treated plants
- positive
  Inorganic fertiliser gave higher cowpea total chlorophyll than organic manure.
  compared with organic manure treated plants
Effect of integrated nutrient management on vegetative growth of cowpea [Vigna unguiculata (L.) Walp.] · 2019
- positive
  T7 produced maximum pod length, immature seed weight and chlorophyll content.
NUTRIENT UPTAKE AND COWPEA PERFORMANCE FOLLOWING EARLY SEASON MAIZE CULTIVATION UNDER DIFFERENT FERTILIZER TYPES · 2020
- positive
  Cowpea on previously amended poultry manure plus urea soil had significantly higher chlorophyll content.
cited by 1 paper here
Residual and direct effect of integrated nutrient management on growth, yield, monetary efficiency, nutrient uptake of cowpea and soil properties under grain amaranth ( Amaranthus hypochondriacus L.)–cowpea [ Vigna unguiculata (L.) Walp] cropping sequence in Inceptisols of Western India · 2021
- positive
  Under RDN50 FYM + RDN50 BC (T6) cowpea had significantly maximum root nodules per plant, leaf area index and chlorophyll content, statistically similar to RDN50 CF + RDN50 BC (T5) and RDN50 CF + RDN50 FYM (T4).
  compared with RDN50 CF + RDN50 BC (T5)
Bradyrhizobium japonicum AND PHOSPHORUS FERTILIZATION ON Vigna Unguilata (L.) WALP · 2021
- positive
  Phosphorus fertilization increased total chlorophyll, flowering and leaf phosphorus.
Irrigation strategies with saline water and phosphate fertilization in cowpea culture · 2022
- positive
  The 100% phosphate dose mitigated the effect of continuous salt stress on chlorophyll pigment production.
Effect of Spent Mushroom Compost of Pleurotus eous Strain P-31 on Growth Performance and Nodulation of Cowpea (Vigna unguiculata Walp.) · 2022
- positive
  Compost at 5–25% promoted cowpea total chlorophyll and chlorophyll a and b.
Investigating the Effect of Different Rates of Chicken Manure on the Growth, Yield and Profitability of Cowpea (Vigna Unguiculata L. Walp) Under Rain Fed Condition in the Upland Soils of Njala, Southern Sierra Leone · 2022
- positive
  Growth traits increased significantly with time and chicken manure rate.
Effect of Biochar on Growth and Yield of Yard long bean (Vigna unguiculata) Under Salinity Stress · 2023
- positive
  Biochar at 6 t ha-1 plus RDF under 0.1 M salinity gave highest chlorophyll content of 63.43 relative to control.
  compared with control T0= no biochar + RDF
Nano NPK and designer seeds for enhancing growth and yield of cowpea · 2024
- positive
  Nano NPK at two thirds dose gave highest chlorophyll content of 5.01 mg/g versus 2.11 mg/g in control.
  compared with absolute control
Response of Potassium Humate as Foliar Sprays on Growth Parameters, Chlorophyll Content, Yield and Quality of Cowpea · 2024
- positive
  Two foliar applications of potassium humate at 400 ppm with GRDF significantly increased total chlorophyll content of cowpea.
  compared with absolute control (T1) and GRDF + water spray (T2)
Magnesium Oxide Nanoparticles as Enhancers of Growth and Biochemical Traits in Cowpea (Vigna unguiculata) · 2025
- positive
  NPK fertilizer gave the highest leaf chlorophyll content.
Integrating Coal-Based Organic and Inorganic Fertilizers to Enhance Cowpea (Vigna unguiculata [L.] Walp) Productivity and Soil Health Across Nigerian Agroecological Zones · 2025
- positive
  100% NPK gave the highest chlorophyll content (SPAD = 54) in Kano.
cites 1 paper here
INFLUENCE OF ORGANIC, PHOSPHATE FERTILIZATION AND SPRAYING OF L-GLUTAMIC ACID ON GROWTH AND YIELD OF COWPEA · 2026
- positive
  The combined treatment produced maximum chlorophyll concentration.

Papers reporting a negative result or no effect 2

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.

fertilization · Physiology: pigments · Vigna unguiculata (cowpea)

How these papers cite each other

Papers reporting a positive result 23

Papers reporting a negative result or no effect 2

fertilization on Vigna unguiculata (cowpea) against other targets

fertilization · physiology: pigments on other organisms