Abstract
Abstract Cover crops (CCs) are promoted in agricultural systems because of multi‐functionality claims of CCs increasing soil health, improving nutrient management, and enhancing crop yields. However, the adoption of CCs by farmers remains marginal in the United States because of the direct increase in the cost of planting and potential interference of CCs with grain crop production. The objective of this study was to examine the effects of CC and noCC rotations; corn ( Zea mays L.) −cereal rye ( Secale cereale L.)−soybean [ Glycine max (L.) Merr.]−hairy vetch ( Vicia villosa R.) [CcrShv], corn−cereal rye−soybean−oat+radish ( Avena sativa L.+ Raphanus sativus L.) [CcrSor], and corn−noCC−soybean−noCC [CncSnc] and two tillage systems [no‐tillage (NT) and conventional tillage (CT)] on aboveground plant attributes including dry matter yield, C/N ratio, N uptake, and crop yields. Rotation with hairy vetch as a preceding CC (CcrShv) increased corn grain yield by 14.09 and 12.35% compared to rotations having noCC and oat+radish as preceding CCs in one of the years, respectively. Nitrogen uptake by cereal rye preceding soybean in CcrShv and CcrSor was 16−20 kg ha −1 greater compared to winter weeds in CncSnc. Higher C/N ratio of cereal rye resulted in immobilizing N. Soybean yields for both CC treatments with NT and CT were 0.3−0.6 Mg ha −1 reduced compared to noCC. Our results indicated that hairy vetch was better than oat+radish for supplying additional N to corn thereby improving corn yields. However, cereal rye preceding soybean may negatively impact soybean yields.
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Claims 7
Claim · model-written summary
Hairy vetch preceding corn increased corn grain yield by 14.09% against no cover crop.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- hairy vetche0
- Outcome
- corn grain yielde0
- Direction
- increasede0
- Value
- 14.09e0
- Qualifier
- in one of the yearse0
- Comparator
- noCCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rotation with hairy vetch as a preceding CC (CcrShv) increased corn grain yield by 14.09 and 12.35% compared to rotations having noCC and oat+radish as preceding CCs in one of the years, respectively.”
t0“corn–soybean”
Claim · model-written summary
Hairy vetch preceding corn increased corn grain yield by 12.35% against oat and radish.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- hairy vetche0
- Outcome
- corn grain yielde0
- Direction
- increasede0
- Value
- 12.35%e0
- Comparator
- oat+radishe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rotation with hairy vetch as a preceding CC (CcrShv) increased corn grain yield by 14.09 and 12.35% compared to rotations having noCC and oat+radish as preceding CCs in one of the years, respectively.”
t0“corn–soybean”
Claim · model-written summary
Cereal rye preceding soybean had 16−20 kg ha −1 greater nitrogen uptake than winter weeds.
Verbatim
e0“Nitrogen uptake by cereal rye preceding soybean in CcrShv and CcrSor was 16−20 kg ha −1 greater compared to winter weeds in CncSnc.”
t0“Nitrogen uptake by cereal rye preceding soybean”
Claim · model-written summary
Higher cereal rye C/N ratio resulted in nitrogen immobilization.
Verbatim
e0“Higher C/N ratio of cereal rye resulted in immobilizing N.”
t0“Higher C/N ratio of cereal rye resulted in immobilizing N.”
Claim · model-written summary
Cover crops reduced soybean yield under both tillage systems against no cover crop.
- Taxon
- soybean
Glycine maxt0 - Treatment
- both CC treatmentse0
- Outcome
- Soybean yieldse0
- Direction
- reducede0
- Value
- 0.3−0.6 Mg ha −1e0
- Qualifier
- with NT and CTe0
- Comparator
- noCCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soybean yields for both CC treatments with NT and CT were 0.3−0.6 Mg ha −1 reduced compared to noCC.”
t0“soybean”
Claim · model-written summary
Hairy vetch supplied more nitrogen to corn than oat and radish.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- supplying additional N to corne0
- Direction
- bettere0
- Comparator
- oat+radishe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hairy vetch was better than oat+radish for supplying additional N to corn”
t0“corn”
Claim · model-written summary
Cereal rye preceding soybean may negatively affect soybean yields.
- Taxon
- soybeanGlycine maxt0
- Outcome
- soybean yieldse0
- Qualifier
- may negatively impacte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cereal rye preceding soybean may negatively impact soybean yields.”
t0“soybean”
The same questions in other papers
Vicia villosa · yield · Zea mays (maize)Positive and negative results
44 papers in the same direction as this paper · 5 in the opposite direction · 4 reporting no difference from an alternative
- positive
- positive
- positive
50 papers more in this group
See all 54 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.