Abstract
Abstract Plant architecture and N fertilizer may limit the performance of intercropped maize ( Zea mays L.) and cowpea [ Vigna unguiculata (L.) Walpers] cultivars. This paper describes an experiment in which cultivars of maize and cowpea were intercropped and fertilized with varying rates of N. The cowpea cultivars tested included a semi‐erect and photoperiod‐insensitive cultivar, TV × 3236, and a photoperiod‐sensitive cultivar, Vita 5. Both were intercropped in factorial combinations with three maize cultivars: a short, early maturing cultivar, Population 49, the tall, highly vegetative cultivars, TZSRW and TZPB. All cultivars were grown in an Alfisol soil (Oxic Paleustalf, Egbeda series) with rates of 0, 40, 80, and 120 kg N/ha applied. Maize responded positively to N fertilization. Grain yields of maize increased 62% with N rates from 0 to 120 kg/ha, while average cowpea yield decreased 27%. The magnitude of these changes varied with maize and cowpea architecture and growth habits. There are available cultivars of maize and cowpea that are compatible for mixed cropping, especially at high rates of N application. The sensitivity of the various treatments used was improved by use of bivariate analysis.
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Claims 4
Claim · model-written summary
Grain yield of maize increased 62% with N rates from 0 to 120 kg/ha.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize responded positively to N fertilization”
e1“Grain yields of maize increased 62% with N rates from 0 to 120 kg/ha”
Claim · model-written summary
Average cowpea yield decreased 27% across the N rates from 0 to 120 kg/ha in intercropping.
- Taxon
- cowpea
Vigna unguiculatae2 - Treatment
- N rates from 0 to 120 kg/hae1
- Outcome
- average cowpea yielde2
- Direction
- decreasede2
- Value
- 27%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Grain yields of maize increased 62% with N rates from 0 to 120 kg/ha”
e2“while average cowpea yield decreased 27%”
Claim · model-written summary
The magnitude of the maize and cowpea yield changes varied with maize and cowpea architecture and growth habits.
- Treatment
- maize and cowpea architecturee3
- Outcome
- magnitude of these changese3
- Direction
- variede3
- Qualifier
- with maize and cowpea architecture and growth habitse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“The magnitude of these changes varied with maize and cowpea architecture and growth habits”
Claim · model-written summary
Available maize and cowpea cultivars are compatible for mixed cropping, especially at high N rates.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“There are available cultivars of maize and cowpea that are compatible for mixed cropping, especially at high rates of N application”
The same questions in other papers
nitrogen · yield · Vigna unguiculata (cowpea)Results differ
5 papers in the same direction as this paper · 62 in the opposite direction
- positive
- positive
- positive
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See all 68 papers →nitrogen · yield · Zea mays (maize)Positive and negative results
1,905 papers in the same direction as this paper · 234 in the opposite direction · 45 reporting no difference from an alternative
- negative
- no effect
- negative
2,181 papers more in this group
See all 2,185 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.