Abstract
Frequency of soil moisture depletion and subsequent crop yield reduction resulting from water use by cover crops is unclear. Effects of cover crop residues and imgation on soybean emergence, canopy volume, grain yield, and soil moisture in eastern Nebraska were determined. Cover crop treatments included five common species and a bare soil control. Precipitation treatments included rainfed conditions and weekly irrigation events of 18 mm (0.7 in) in June and July. Above-normal May rainfall in 1995 and 1936 resulted in similar percent volumetric soil water contents (%VSWC) in the surface 15.2-cm (6.0-in) soil layer. Soybean emergence was unaffected by residue dry matter levels below 3,170 kg/ha (2,830 lb/ac) . Early-emon soybean growth was similar across all treatments; however, cover crop biomass greater than 2,170 kg/ha (1,940 lb/ac) reduced soybean canopy volume 33 to 44% during mid-season droughts. Yields were highest when stand densities were maintained and weed were suppressed. This research develops a greater understanding of how cover crop residues influence soybean performance, ultimately reducing reliance on postemergent herbicide use for weed control in no-tillage systems.
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Claims 4
Claim · model-written summary
Soybean emergence was unaffected below 3,170 kg/ha residue dry matter.
- Taxon
- Soybean
Glycine maxe0 - Treatment
- residue dry matter levels below 3,170 kg/hae0
- Outcome
- emergencee0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean emergence was unaffected by residue dry matter levels below 3,170 kg/ha (2,830 lb/ac)”
Claim · model-written summary
Early-season soybean growth was similar across treatments.
- Taxon
- soybeanGlycine maxe0
- Treatment
- all treatmentse0
- Outcome
- growthe0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Early-emon soybean growth was similar across all treatments”
Claim · model-written summary
Cover crop biomass greater than 2,170 kg/ha reduced soybean canopy volume 33 to 44% during mid-season droughts.
- Taxon
- soybeanGlycine maxe0
- Treatment
- cover crop biomass greater than 2,170 kg/hae0
- Outcome
- soybean canopy volumee0
- Direction
- reducede0
- Value
- 33 to 44%e0
- Qualifier
- during mid-season droughtse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cover crop biomass greater than 2,170 kg/ha (1,940 lb/ac) reduced soybean canopy volume 33 to 44% during mid-season droughts”
Claim · model-written summary
Yields were highest where stand density was maintained and weeds were suppressed.
- Taxon
- soybeanGlycine maxe1
- Treatment
- weed were suppressede0
- Outcome
- Yieldse0
- Direction
- higheste0
- Qualifier
- when stand densities were maintained and weed were suppressede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yields were highest when stand densities were maintained and weed were suppressed”
e1“soybean canopy volume”
The same questions in other papers
cover crop · growth · Glycine max (soybean)Positive and negative results
12 papers in the same direction as this paper · 9 in the opposite direction
- no effect
- no effect
- negative
18 papers more in this group
See all 22 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.