Abstract
Abstract Little research attention has been given to growing summer cover crops as part of conservation agriculture systems. Three cover crops (sorghum [Sorghum bicolor], mucuna [Mucuna pruriens] and sunhemp [Crotalaria juncea]) were relay-intercropped into maize [Zea mays] 42 days after planting maize. Biomass yields, N uptake and maize yield were measured. In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize. Nitrogen uptake followed a similar pattern with mucuna having the highest N-uptake of 70 kg N ha−1 in relay-intercropping as compared to the > 250 kg N ha−1 in the sole cropping system. Maize biomass and grain yields were not affected by relay-intercropping cover crops. The low cover crop biomass yields in relay-intercropping may not be viable for sustainable conservation agriculture. Keywords: Conservation agricultureC/N ratiomucunasorghumsunhemp
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Claims 9
Claim · model-written summary
In sole cropping, sorghum had the highest dry weight (11 t ha−1).
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
In sole cropping, sunhemp dry weight was 7.2 t ha−1, behind sorghum.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
In sole cropping, mucuna dry weight was 6.1 t ha−1, the lowest of the three cover crops.
MucunaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
Relay-intercropping into maize cut sorghum cover crop biomass yield by 85%, a significant drop.
- Treatment
- relay-intercropped into maizee0
- Outcome
- cover crop biomass yieldse0
- Direction
- droppede0
- Value
- 85%e0
- Comparator
- sole croppinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
Relay-intercropping into maize cut sunhemp cover crop biomass yield by 70%, a significant drop.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
Relay-intercropping into maize cut mucuna cover crop biomass yield by 70%, a significant drop.
- Treatment
- relay-intercropped into maizee0
- Outcome
- cover crop biomass yieldse0
- Direction
- droppede0
- Value
- 70%e0
- Comparator
- sole croppinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In sole cropping, sorghum had the highest dry weight (11 t ha−1) followed by sunhemp (7.2 t ha−1) and mucuna (6.1 t ha−1). However, cover crop biomass yields dropped significantly (85% for sorghum, 70% for sunhemp and mucuna) when relay-intercropped into maize”
Claim · model-written summary
Mucuna had the highest N uptake (70 kg N ha−1) under relay-intercropping, compared with more than 250 kg N ha−1 in sole cropping.
- Treatment
- relay-intercroppinge1
- Outcome
- N-uptakee1
- Direction
- higheste1
- Value
- 70 kg N ha−1e1
- Qualifier
- > 250 kg N ha−1e1
- Comparator
- sole cropping systeme1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Nitrogen uptake followed a similar pattern with mucuna having the highest N-uptake of 70 kg N ha−1 in relay-intercropping as compared to the > 250 kg N ha−1 in the sole cropping system”
Claim · model-written summary
Relay-intercropping cover crops did not affect maize biomass or grain yield.
- Treatment
- relay-intercropping cover cropse2
- Outcome
- Maize biomass and grain yieldse2
- Direction
- not affectede2
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Maize biomass and grain yields were not affected by relay-intercropping cover crops”
Claim · model-written summary
Low cover crop biomass in relay-intercropping may not be viable for sustainable conservation agriculture.
Verbatim
e3“The low cover crop biomass yields in relay-intercropping may not be viable for sustainable conservation agriculture”
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See all 222 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.