Abstract
Field experiments were conducted on Alfisols in Nigeria between 1991 and 1993 to determine the residual effect of maize ( Zea mays ) and cowpea ( Vigna unguiculata ) on the growth, pod yield and N response of a succeeding okra ( Abelmoschus esculentus ) crop. Cowpea and maize were grown alone with 30 and 60 kg/ha of N, P and K, respectively, or intercropped with 60 kg/ha as a basal dressing. The preceding crops had a significant effect on soil nutrient changes, okra growth and yield, and N response of okra. Cowpea increased the N, P and K status of the soil in both sole and mixed stands, compared with sole maize. Leaf area, pod weight and marketable pod yield of okra after sole cowpea or the maize/cowpea intercrop were all significantly higher than after sole maize. Although the application of nitrogen to succeeding okra promoted growth and increased pod yield, this was not accompanied by an increase in the pod yield of okra after sole cowpea or the maize/cowpea treatment beyond 45 kg N/ha. The beneficial effects of the preceding maize/cowpea intercrop on soil fertility, okra pod yield and amounts of N required for okra were partly due to the higher rate of basal nutrients applied as compared to the effects following sole cowpea.
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Claims 6
Claim · model-written summary
Cowpea increased soil N, P and K status in both sole and mixed stands compared with sole maize
- Taxon
- okra
.jpg?width=60)
Abelmoschus esculentust0 - Treatment
- Cowpeae4
- Outcome
- N, P and K status of the soile4
- Direction
- increasede4
- Comparator
- sole maizee4
- Setting
- Alfisols in Nigeriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e4“Cowpea increased the N, P and K status of the soil in both sole and mixed stands, compared with sole maize”
e0“Field experiments were conducted on Alfisols in Nigeria between 1991 and 1993”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
Claim · model-written summary
Leaf area, pod weight and marketable pod yield of okra after sole cowpea or the maize/cowpea intercrop were significantly higher than after sole maize
- Taxon
- okraAbelmoschus esculentuse5
- Treatment
- sole cowpea or the maize/cowpea intercrope5
- Outcome
- Leaf area, pod weight and marketable pod yielde5
- Direction
- highere5
- Comparator
- sole maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“Leaf area, pod weight and marketable pod yield of okra after sole cowpea or the maize/cowpea intercrop were all significantly higher than after sole maize”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
Claim · model-written summary
Application of nitrogen to succeeding okra promoted growth
- Taxon
- okraAbelmoschus esculentust0
- Treatment
- application of nitrogene6
- Outcome
- growthe6
- Direction
- promotede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Although the application of nitrogen to succeeding okra promoted growth and increased pod yield, this was not accompanied by an increase in the pod yield of okra after sole cowpea or the maize/cowpea treatment beyond 45 kg N/ha”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
Claim · model-written summary
Application of nitrogen to succeeding okra increased pod yield
- Taxon
- okraAbelmoschus esculentust0
- Treatment
- application of nitrogene6
- Outcome
- pod yielde6
- Direction
- increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Although the application of nitrogen to succeeding okra promoted growth and increased pod yield, this was not accompanied by an increase in the pod yield of okra after sole cowpea or the maize/cowpea treatment beyond 45 kg N/ha”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
Claim · model-written summary
Pod yield of okra after sole cowpea or the maize/cowpea intercrop did not increase beyond 45 kg N/ha
- Taxon
- okraAbelmoschus esculentust0
- Treatment
- application of nitrogene6
- Outcome
- pod yielde6
- Direction
- no_changeinferrede6
- Qualifier
- beyond 45 kg N/hae6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Although the application of nitrogen to succeeding okra promoted growth and increased pod yield, this was not accompanied by an increase in the pod yield of okra after sole cowpea or the maize/cowpea treatment beyond 45 kg N/ha”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
Claim · model-written summary
The beneficial effects of the preceding maize/cowpea intercrop on okra are partly due to higher rates of basal nutrients
- Taxon
- okraAbelmoschus esculentust0
- Outcome
- beneficial effectse2
- Qualifier
- partly due to the higher rate of basal nutrients appliede2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“The beneficial effects of the preceding maize/cowpea intercrop on soil fertility, okra pod yield and amounts of N required for okra were partly due to the higher rate of basal nutrients applied as compared to the effects following sole cowpea”
t0“nitrogen requirement of okra (Abelmoschus esculentus)”
The same questions in other papers
Zea mays · quality: postharvest · Abelmoschus esculentus (okra)Positive and negative results
1 in the opposite direction
- negative
nitrogen · yield · Abelmoschus esculentus (okra)Results differ
78 papers in the same direction as this paper · 3 in the opposite direction
- no effect
- no effect
- negative
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See all 82 papers →intercropping · quality: postharvest · Abelmoschus esculentus (okra)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
nitrogen · growth · Abelmoschus esculentus (okra)Positive and negative results
45 papers in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
44 papers more in this group
See all 48 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.