Abstract
ABSTRACT Research in Latin America has shown numerous benefits of rotations with cover crops under conservation agriculture (CA) to manage N and weeds; however, information from Zimbabwe is limited. The objective of the study was to investigate the benefits of rotating maize ( Zea mays L.) with different leguminous and nonleguminous cover crops on maize yield, weed management, and decomposition rates of residues. A study was conducted at University of Zimbabwe (UZ), Domboshawa Training Centre (DTC), and two sites at Henderson Research Station (HRS) with contrasting soil types (clay and sand) from 2008 to 2014. Nine different cover crops were rotated with maize and compared with maize monocropping. During the 2012 to 2013 and 2013 to 2014 cropping seasons, a litter‐bag experiment was set within the experiment at UZ and DTC to investigate residue decomposition rates. Decreases in weed numbers of up to 94% were observed in maize–black sunnhemp ( Crotalaria juncea L.) treatment at DTC. At UZ, maize after jack‐bean [ Canavalia ensiformis (L.) DC.] (7823 kg ha −1 ) showed up to 61% more yield than continuous maize (4851 kg ha −1 ). Maize yields after fodder radish ( Raphanus sativus L. var. oleiformis Pers.) were, in most cases, not significantly different from those of uniform maize. Decomposition rates were faster in leguminous residues, with velvet‐bean [ Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck] residues being generally the fastest and therefore not suitable for ground cover. Despite the positive effects of rotations, not a single cover crop was identified that provided all the benefits. There is need to characterize niches for specific cover crops within the farming system to assist farmers in their choices and spatial arrangements of cover crops on their farms.
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Claims 7
Claim · model-written summary
Maize–black sunnhemp reduced weed numbers by up to 94% at DTC.
- Treatment
- maize–black sunnhempe0
- Interactor
- black sunnhempe0weed
- Outcome
- weed numberse0
- Direction
- Decreasese0
- Value
- up to 94%e0
- Setting
- DTCe0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in weed numbers of up to 94% were observed in maize–black sunnhemp ( Crotalaria juncea L.) treatment at DTC.”
Claim · model-written summary
Maize after jack-bean yielded 7823 kg ha −1, up to 61% more than continuous maize at UZ.
- Treatment
- jack‐beane0
- Outcome
- yielde0
- Direction
- moree0
- Value
- 7823 kg ha −1e0
- Qualifier
- up to 61%e0
- Comparator
- continuous maizee0
- Setting
- UZe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At UZ, maize after jack‐bean [ Canavalia ensiformis (L.) DC.] (7823 kg ha −1 ) showed up to 61% more yield than continuous maize (4851 kg ha −1 ).”
Claim · model-written summary
Maize yields after fodder radish were generally not significantly different from uniform maize.
- Treatment
- fodder radishe0
- Outcome
- Maize yieldse0
- Direction
- not significantly differente0
- Comparator
- uniform maizee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Maize yields after fodder radish ( Raphanus sativus L. var. oleiformis Pers.) were, in most cases, not significantly different from those of uniform maize.”
Claim · model-written summary
Leguminous residues decomposed faster.
Verbatim
e0“Decomposition rates were faster in leguminous residues, with velvet‐bean [ Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck] residues being generally the fastest and therefore not suitable for ground cover.”
Claim · model-written summary
Velvet-bean residues decomposed fastest and were unsuitable for ground cover.
- Taxon
- velvet‐bean
.jpg?width=60)
Mucuna pruriens var. utilise0 - Outcome
- residues being generally the fasteste0
- Direction
- fasteste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“velvet‐bean [ Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck] residues being generally the fastest and therefore not suitable for ground cover”
Claim · model-written summary
No single cover crop supplied all rotation benefits.
Verbatim
e0“not a single cover crop was identified that provided all the benefits”
Claim · model-written summary
The authors recommend characterizing niches for specific cover crops within farming systems.
Verbatim
e0“There is need to characterize niches for specific cover crops within the farming system to assist farmers in their choices and spatial arrangements of cover crops on their farms.”
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See all 5 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.