Abstract
Weed management challenges in the early years of conservation agriculture (CA) adoption may require the use of herbicides for farmers to realise the immediate benefits of CA practices. The objective of this study was to assess the effects of atrazine on soybean grown after maize in a maize-soybean rotation under conservation agriculture. Atrazine was applied at 1.8 kg ha-1 active ingredient (a.i), as a pre-emergence herbicide in the maize phase of the rotation. The study was conducted in Zimbabwe at Domboshawa Training Centre (DTC), Henderson Research Station (HRS) and University of Zimbabwe farm (UZ farm) over two seasons (2011/2012 and 2012/2013). Manual weeding was utilised to keep the study area weed free and eliminate interference from weeds. Weed density, weed biomass, soybean germination, soybean biomass and grain yield were measured. The lowest germination of soybean was recorded at 57% in 2011/2012 at DTC under atrazine + glyphosate + metolachlor in combination with manual weeding treatment. Previous atrazine treatment to maize showed no significant differences on soybean biomass accumulation and broadleaf weed density at all sites in both seasons. The highest soybean yields recorded were 3707 kg ha-1 at DTC in 2011/12 season in atrazine + glyphosate + metolachlor plus manual weeding treatment. Based on results obtained in this study it can be concluded that soybean can be grown in plots where atrazine was applied as a pre-emergent herbicide during the maize phase.
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Claims 5
Claim · model-written summary
Lowest soybean germination was 57% under combined herbicides and manual weeding.
- Taxon
- soybean
Glycine maxe0 - Outcome
- germination of soybeane0
- Direction
- loweste0
- Value
- 57%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The lowest germination of soybean was recorded at 57% in 2011/2012 at DTC under atrazine + glyphosate + metolachlor in combination with manual weeding treatment”
Claim · model-written summary
Prior atrazine treatment showed no significant soybean biomass difference.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Previous atrazine treatment to maizee0
- Outcome
- soybean biomass accumulatione0
- Direction
- no significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Previous atrazine treatment to maize showed no significant differences on soybean biomass accumulation and broadleaf weed density at all sites in both seasons”
Claim · model-written summary
Prior atrazine treatment showed no significant broadleaf weed density difference.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Previous atrazine treatment to maizee0
- Interactor
- broadleaf weede0weed
- Outcome
- broadleaf weed densitye0
- Direction
- no significant differencese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Previous atrazine treatment to maize showed no significant differences on soybean biomass accumulation and broadleaf weed density at all sites in both seasons”
Claim · model-written summary
Highest soybean yield was 3707 kg ha-1 under combined herbicides and manual weeding.
- Taxon
- soybeanGlycine maxe0
- Outcome
- soybean yieldse0
- Direction
- higheste0
- Value
- 3707 kg ha-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest soybean yields recorded were 3707 kg ha-1 at DTC in 2011/12 season in atrazine + glyphosate + metolachlor plus manual weeding treatment”
Claim · model-written summary
The authors conclude soybean can follow atrazine-treated maize.
- Taxon
- soybeanGlycine maxe0
- Outcome
- soybean can be grown in plots where atrazine was applied as a pre-emergent herbicide during the maize phasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean can be grown in plots where atrazine was applied as a pre-emergent herbicide during the maize phase”
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