Abstract
Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume. Key words: Cowpea, crop sequences, maize, nitrogen budgets, sparingly soluble phosphorus.
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Claims 6
Claim · model-written summary
Maize grain yield doubled after cowpea monocrop versus maize after maize.
- Treatment
- cowpea monocrope0
- Outcome
- grain yield of maizee0
- Direction
- doublede0
- Comparator
- maize following maizee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
Claim · model-written summary
Maize N uptake increased 60% after cowpea monocrop.
- Treatment
- cowpea monocrope0
- Outcome
- N uptakee0
- Direction
- increasede0
- Value
- 60%e0
- Comparator
- maize following maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
Claim · model-written summary
Cowpea monocrop prior to maize had N value equivalent to 50 kg N ha-1 mineral fertilizer.
- Treatment
- cowpea monocropped prior to maize monocrope0
- Outcome
- N-valuee0
- Direction
- equivalente0
- Value
- 50 kg N ha-1e0
- Comparator
- mineral fertilisere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
Claim · model-written summary
Maize yield increased 67% after maize-cowpea intercrop.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
Claim · model-written summary
Following maize recovered around 34% of cowpea residue N.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
Claim · model-written summary
Applying sparingly soluble P to first-season legume had no second-season maize benefit.
- Treatment
- applying sparingly soluble P sources to the first season legumee0
- Outcome
- benefit on the second season maizee0
- Direction
- no benefite0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Advantages of cowpea were tested in terms of net N-input by cowpea mono- or intercropped with maize in a crop sequence where sparingly soluble P sources were added to the first year crop. The grain yield of maize grown after cowpea monocrop was doubled and the N uptake increased by 60% compared to maize following maize. The N-value of growing cowpea monocropped prior to maize monocrop was equivalent to the application of 50 kg N ha-1 as mineral fertiliser. When maize followed a maize-cowpea intercrop, grain yield was increased by 67%. Around 34% of the N contained in cowpea residues was recovered in the following maize as estimated by 15N. There was however no benefit on the second season maize of applying sparingly soluble P sources to the first season legume.”
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