Abstract
ABSTRACT Nitrogen nutrition of sole maize crops is problematic in ‘no-input’ agricultural systems. The ability of the N2 fixing cover crops. Mucuna pruriens var. utilis and Pueraria phaseoloides, to sustain annual cropping of sole maize was tested from 1997 to 2000, with the fallow biomass either burned or retained. In 1997, 1999 and 2000, maize grain dry matter yield was significantly higher after M. pruriens and P. phaseoloides than after natural fallow regrowth. The fallow type had no effect on grain yield in 1998. Burning of the biomass before planting maize increased grain yield in 1998 but had no effect in 1997, 1999 and 2000. The cumulative grain yield over 4 years was 9.14 Mg ha−1 in the natural fallow regrowth, significantly less than after M. pruriens (11.73 Mg ha−1) and P.phaseoloides (12.54 Mg ha−1). Burning the biomass, although nonsignificant in 3 out of 4 years, had a cumulative advantage with 11.72 Mg ha−1 grain yield, compared with biomass retention (10.55 Mg ha−1, p = 0.0 19). The economically important yield of marketable cobs was on average approximately US$320 ha−1 year−1 higher after burned P. phaseoloides cover crop than after burned natural fallow regrowth. The lack of a positive yield response to biomass and thus N retention was related to problems of maize establishment. The nitrogen contained in the aboveground cover crop biomass appears not to he essential for maize nutrition under the site conditions.
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Claims 12
Claim · model-written summary
Maize grain yield was significantly higher after M. pruriens than natural fallow in 1997, 1999, and 2000.
- Treatment
- M. pruriense0
- Outcome
- maize grain dry matter yielde0
- Direction
- highere0
- Qualifier
- 1997, 1999 and 2000e0
- Comparator
- natural fallow regrowthe0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1997, 1999 and 2000, maize grain dry matter yield was significantly higher after M. pruriens and P. phaseoloides than after natural fallow regrowth.”
t0“Maize”
Claim · model-written summary
Maize grain yield was significantly higher after P. phaseoloides than natural fallow in 1997, 1999, and 2000.
- Treatment
- P. phaseoloidese0
- Outcome
- maize grain dry matter yielde0
- Direction
- highere0
- Qualifier
- 1997, 1999 and 2000e0
- Comparator
- natural fallow regrowthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1997, 1999 and 2000, maize grain dry matter yield was significantly higher after M. pruriens and P. phaseoloides than after natural fallow regrowth.”
t0“Maize”
Claim · model-written summary
Fallow type had no effect on grain yield in 1998.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The fallow type had no effect on grain yield in 1998.”
t0“Maize”
Claim · model-written summary
Burning biomass increased grain yield in 1998.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning of the biomass before planting maize increased grain yield in 1998”
Claim · model-written summary
Burning biomass had no grain-yield effect in 1997, 1999, and 2000.
- Treatment
- Burning of the biomasse0
- Outcome
- grain yielde0
- Direction
- no effecte0
- Qualifier
- 1997, 1999 and 2000e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning of the biomass before planting maize increased grain yield in 1998 but had no effect in 1997, 1999 and 2000.”
Claim · model-written summary
Four-year cumulative grain yield after natural fallow was 9.14 Mg ha−1.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cumulative grain yield over 4 years was 9.14 Mg ha−1 in the natural fallow regrowth”
t0“Maize”
Claim · model-written summary
Four-year cumulative grain yield after M. pruriens was 11.73 Mg ha−1, significantly above natural fallow.
- Treatment
- M. pruriense0
- Outcome
- cumulative grain yielde0
- Direction
- less thane0
- Value
- 11.73 Mg ha−1e0
- Comparator
- natural fallow regrowthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cumulative grain yield over 4 years was 9.14 Mg ha−1 in the natural fallow regrowth, significantly less than after M. pruriens (11.73 Mg ha−1) and P.phaseoloides (12.54 Mg ha−1).”
t0“Maize”
Claim · model-written summary
Four-year cumulative grain yield after P. phaseoloides was 12.54 Mg ha−1, significantly above natural fallow.
- Treatment
- P.phaseoloidese0
- Outcome
- cumulative grain yielde0
- Direction
- less thane0
- Value
- 12.54 Mg ha−1e0
- Comparator
- natural fallow regrowthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The cumulative grain yield over 4 years was 9.14 Mg ha−1 in the natural fallow regrowth, significantly less than after M. pruriens (11.73 Mg ha−1) and P.phaseoloides (12.54 Mg ha−1).”
t0“Maize”
Claim · model-written summary
Burning biomass gave 11.72 Mg ha−1 cumulative grain yield versus 10.55 Mg ha−1 with biomass retention.
- Treatment
- Burning the biomasse0
- Outcome
- grain yielde0
- Direction
- cumulative advantagee0
- Value
- 11.72 Mg ha−1e0
- Qualifier
- 10.55 Mg ha−1e0
- Comparator
- biomass retentione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Burning the biomass, although nonsignificant in 3 out of 4 years, had a cumulative advantage with 11.72 Mg ha−1 grain yield, compared with biomass retention (10.55 Mg ha−1, p = 0.0 19).”
t0“Maize”
Claim · model-written summary
Marketable cob yield was about US$320 ha−1 year−1 higher after burned P. phaseoloides than burned natural fallow.
- Treatment
- burned P. phaseoloides cover crope0
- Outcome
- yield of marketable cobse0
- Direction
- highere0
- Value
- US$320 ha−1 year−1e0
- Comparator
- burned natural fallow regrowthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The economically important yield of marketable cobs was on average approximately US$320 ha−1 year−1 higher after burned P. phaseoloides cover crop than after burned natural fallow regrowth.”
t0“Maize”
Claim · model-written summary
The authors relate the lack of yield response to biomass retention to maize-establishment problems.
- Treatment
- biomass and thus N retentione0
- Outcome
- yield responsee0
- Qualifier
- problems of maize establishmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lack of a positive yield response to biomass and thus N retention was related to problems of maize establishment.”
Claim · model-written summary
The authors suggest that nitrogen in aboveground cover-crop biomass was not essential for maize nutrition at the site.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The nitrogen contained in the aboveground cover crop biomass appears not to he essential for maize nutrition under the site conditions.”
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See all 322 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.