Abstract
The use of cowpea as a green manure crop is not popular among Ghanaian farmers but the potential to use it exists. A determinate cowpea variety was tested for two years in the semi-deciduous rain forest zone of Ghana for grain yields and green manure effects. Four treatments consisting of control, mineral fertilizer at 51-30-30 kg NPK ha-1, cowpea green manure and cowpea green manure + 25-15-15 kg NPK ha-1 in RCBD of four replications were employed. Pods were harvested at physiological maturity for grain, while the green leaf and stem biomass were cut and incorporated into the soil. The maize crop that followed the cowpea green manure produced stover yields of about 10.7 t ha-1 which was not different from that of the mineral fertilizer. A mean maize grain yield of 3.6 t ha-1 was obtained from the green manured plants in addition to cowpea grain yield of over 1.2 t ha-1. The mineral fertilizer plots produced similar maize grain yield. A combination of cowpea green manure and half rate of the mineral fertilizer produced significantly greater maize stover and grain yields than sole green manure and sole mineral fertilizer. Cowpea green manure slightly improved the level of some soil nutrients. The results suggest that cowpea can be used as a green manure crop. L\'usage du niébé comme culture de l\'engrais vert n\'est pas populaire parmi les paysans ghanéens. Néanmoins, il y a toujours la potentialité de l\'usage. Une variété déterminée du Niébé était examinée pour deux ans dans la zone forêt dense humide sémi-caduque au Ghana. L\'objectif était pour examiner le rendement du grain et les effets de l\'engrais vert. Quatre traitements y compris le contrôle, l\'engrais minéral à 51-30-30 kg, NPK ha-1, l\'engrais vert du niébé et l\'engrais vert du niébé + 25 - 15 - 15 kg NPK ha-1 dans le RCBD de quatre réplications étaient employés. Les gousses étaient récoltées à la maturité physiologque pour le grain, alors que la feuille verte et la biomosse de la tige étaient coupeés et incorporeés dans le sol. Le maїs qui suivait l\'engrais vert du niébé a produit le rendement d\' à peu près 10.7 t ha-1 qui n\'était pas différent de celui de l\'engrais minéral. Un rendement moyen du maїs de 3.6 t ha-1 était obtenu des cultures de l\'engrais vert en plus de rendement du niébé au dessus de 1.2 t ha-1. Les parcelles de l\'engrais minéral ont produit de même rendement du maїs. Une combinaison de l\'engrais vert du niébé et un niveau moitié de l\'engrais minéral ont produit d\'une manière considérable un rendement plus élevé que l\'engrais vert et l\' engrais minéral uniques. L\'engrais vert du niébé a peu amelioré le niveau des nutriments du sol. Les resultats suggèrent qu\'on peut utiliser le niébé comme culture de l\'engrais vert. Keywords: Cowpea, green manure, rain forest, maize yields, soil nutrients. Agricultural and Food Science Journal of Ghana Vol. 6 2007 pp. 459-470
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Claims 8
Claim · model-written summary
Maize after cowpea green manure produced about 10.7 t ha-1 stover, similar to mineral fertilizer.
- Treatment
- cowpea green manuree0
- Outcome
- stover yieldse0
- Value
- about 10.7 t ha-1e0
- Comparator
- mineral fertilizere0
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maize crop that followed the cowpea green manure produced stover yields of about 10.7 t ha-1 which was not different from that of the mineral fertilizer.”
Claim · model-written summary
Green manured maize yielded a mean 3.6 t ha-1 grain.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mean maize grain yield of 3.6 t ha-1 was obtained from the green manured plants in addition to cowpea grain yield of over 1.2 t ha-1.”
Claim · model-written summary
Cowpea grain yield exceeded 1.2 t ha-1 alongside green manured maize.
- Taxon
- cowpea
Vigna unguiculatae0 - Outcome
- cowpea grain yielde0
- Value
- over 1.2 t ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A mean maize grain yield of 3.6 t ha-1 was obtained from the green manured plants in addition to cowpea grain yield of over 1.2 t ha-1.”
Claim · model-written summary
Mineral fertilizer plots produced similar maize grain yield.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mineral fertilizer plots produced similar maize grain yield.”
Claim · model-written summary
Combining cowpea green manure with half-rate mineral fertilizer significantly increased maize stover yield over either input alone.
- Treatment
- A combination of cowpea green manure and half rate of the mineral fertilizere0
- Outcome
- maize stovere0
- Direction
- greatere0
- Comparator
- sole green manure and sole mineral fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A combination of cowpea green manure and half rate of the mineral fertilizer produced significantly greater maize stover and grain yields than sole green manure and sole mineral fertilizer.”
Claim · model-written summary
Combining cowpea green manure with half-rate mineral fertilizer significantly increased maize grain yield over either input alone.
- Treatment
- A combination of cowpea green manure and half rate of the mineral fertilizere0
- Outcome
- grain yieldse0
- Direction
- greatere0
- Comparator
- sole green manure and sole mineral fertilizere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A combination of cowpea green manure and half rate of the mineral fertilizer produced significantly greater maize stover and grain yields than sole green manure and sole mineral fertilizer.”
Claim · model-written summary
Cowpea green manure slightly improved some soil nutrient levels.
- Taxon
- CowpeaVigna unguiculatae0
- Treatment
- Cowpea green manuree0
- Outcome
- level of some soil nutrientse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cowpea green manure slightly improved the level of some soil nutrients.”
Claim · model-written summary
The authors suggest using cowpea as a green manure crop.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- cowpea can be used as a green manure crope0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The results suggest that cowpea can be used as a green manure crop.”
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