Journal ArticleDOI
Effects of Cereal and Legume Cover Crop Residues on Weeds, Yield, and Net Return in Soybean (Glycine max)1
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A 2-yr field study was conducted during 1998 and 1999 at Stoneville, MS, on a Dundee silt loam to determine weed control, yield, and net return associated with winter cover crops in soybean.Abstract:
A 2-yr field study was conducted during 1998 and 1999 at Stoneville, MS, on a Dundee silt loam to determine weed control, yield, and net return associated with winter cover crops in soybean. Cover crop systems included Italian ryegrass, oat, rye, wheat, hairy vetch, crimson clover, subterranean clover, no-cover crop conventional tillage (CT), and no-cover crop no-tillage (NT), all with standard preemergence (PRE), postemergence (POST), PRE + POST, and no-herbicide weed management. Oat (11.1 Mg/ha) had highest dry biomass compared to all other cover crops (6.0 to 7.6 Mg/ha) at soybean planting. Biomass decreased 9 wk after planting (WAP) compared to the respective biomass at soybean planting in all cover crops. Italian ryegrass and rye biomass decay was slow and about two-thirds of plant residue persisted at 9 WAP. Cover crops had no effect on densities of barnyardgrass, prickly sida, and yellow nutsedge, but altered the density of browntop millet. Total weed biomass was higher in rye, wheat, and subterran...read more
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Journal ArticleDOI
Herbicide Resistance: Toward an Understanding of Resistance Development and the Impact of Herbicide-Resistant Crops
William K. Vencill,Robert L. Nichols,Theodore M. Webster,John K. Soteres,Carol A. Mallory-Smith,Nilda R. Burgos,William G. Johnson,Marilyn McClelland +7 more
TL;DR: Development of herbicide-resistant crops has resulted in significant changes to agronomic practices, one of which is the adoption of effective, simple, low-risk, crop-production systems with less dependency on tillage and lower energy requirements.
Journal ArticleDOI
Soybean Yield as Affected by Biomass and Nitrogen Uptake of Cereal Rye in Winter Cover Crop Rotations
TL;DR: Rye WCC planted after corn appears to take up a significant proportion of residual NO 3 -N without affecting soybean grain yield, providing an environmental service to the agroecosystem.
Journal ArticleDOI
Allelopathic Potential of Winter Cereals and Their Cover Crop Mulch Effect on Grass Weed Suppression and Corn Development
TL;DR: The results of this study suggest that some winter cereals such as barley cultivar Athinaida could be used as cover crop for annual grass weed suppression in corn and consequently to minimize herbicide applications.
Journal ArticleDOI
Weed Management in conservation crop production systems
TL;DR: This review summarizes recent research on weed management aspects in conservation crop production systems and indicates that a general increase in perennial weeds and grass species has been observed in many long-term conservation management studies.
References
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Journal ArticleDOI
Light transmittance, soil temperature, and soil moisture under residue of hairy vetch and rye
TL;DR: In this paper, the light, temperature, and moisture conditions under cover crop residue were investigated and it was shown that removal of cover crop residues is sufficient to suppress emergence of weeds but maintenance of soil moisture could increase weed emergence.
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Contribution of Cover Crops to Weed Management in Sustainable Agricultural Systems
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Response of weeds to tillage and cover crop residue.
TL;DR: Despite differences in weed density among treatments, weed biomass was equivalent in all treatments during the last 2 yr and total weed density increased after 1 yr of no- tillage and after 2 yr of conventional tillage in a 4-yr experiment.
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Nonpoint source contamination of the Mississippi River and its tributaries by herbicides
TL;DR: A study of the Mississippi River and its tributaries during July-August 1991, October-November 1991, and AprilMay 1992 has indicated that the entire navigable reach of the river is contaminated with a complex mixture of agrochemicals and their transformation products derived from nonpoint sources.
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Weed suppression by live and desiccated hairy vetch (Vicia villosa)
TL;DR: Changes in light extinction, red to far-red ratio, and diurnal soil temperature amplitude were sufficient to explain greater weed suppression by live than desiccated hairy vetch.