Abstract
Abstract Corn ( Zea mays L.) is a widely grown crop in the USA that responds positively to crop rotation. This study compares yields of corn grown in continuous monoculture with that of a (i) 2‐yr soybean [ Glycine max (L.) Merr.1‐ corn rotation; (ii) a 4‐yr soybean‐grain sorghum [ Sorghum bicolor (L.) Moenchj‐oat + clover [ Avena sativa L. interseeded with 80% Melilotus officinalis (L.) Lam., 20% Trifolium pratense ] corn rotation; and (iii) a 4‐yr oat + clover‐grain sorghum‐soybean‐ corn rotation. Interactions between crop rotation and N rate were also determined. The study was conducted for 4 yr on a Sharpsburg silty clay loam (fine, montmorillonitic, mesic Typic Argiudoll). Continuous corn produced less grain (5.5 mg ha −1 yr −1 ) than corn grown in rotation (7.6 Mg ha −1 yr −1 average). Corn following a legume in rotation produced maximum grain yield with 90 kg N ha −1 , while continuous corn required at least 180 kg N ha −1 for maximum yield. Corn following oat + clover produced maximum yield in a year of above‐average precipitation, but this rotation was vulnerable to soil‐water deficits. In 3 of 4 yr, corn following soybean in a 4‐yr rotation produced more grain than other rotations.
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Claims 7
Claim · model-written summary
Continuous corn yielded 5.5 mg ha −1 yr −1, less than rotated corn.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Continuous corne0
- Outcome
- graine0
- Direction
- lesse0
- Value
- 5.5 mg ha −1 yr −1e0
- Qualifier
- 7.6 Mg ha −1 yr −1 averagee0
- Comparator
- corn grown in rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Continuous corn produced less grain (5.5 mg ha −1 yr −1 ) than corn grown in rotation (7.6 Mg ha −1 yr −1 average)”
Claim · model-written summary
Rotated corn averaged 7.6 Mg ha −1 yr −1 grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- graine0
- Value
- 7.6 Mg ha −1 yr −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Continuous corn produced less grain (5.5 mg ha −1 yr −1 ) than corn grown in rotation (7.6 Mg ha −1 yr −1 average)”
Claim · model-written summary
Corn after a legume reached maximum yield with 90 kg N ha −1.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- 90 kg N ha −1e0
- Outcome
- grain yielde0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn following a legume in rotation produced maximum grain yield with 90 kg N ha −1”
Claim · model-written summary
Continuous corn required at least 180 kg N ha −1 for maximum yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- at least 180 kg N ha −1e0
- Outcome
- yielde0
- Direction
- maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“continuous corn required at least 180 kg N ha −1 for maximum yield”
Claim · model-written summary
Corn after oat and clover had maximum yield in an above-average precipitation year.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- following oat + clovere0
- Outcome
- yielde0
- Direction
- maximume0
- Setting
- above‐average precipitatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn following oat + clover produced maximum yield in a year of above‐average precipitation”
Claim · model-written summary
The oat and clover rotation was vulnerable to soil-water deficits.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- vulnerable to soil‐water deficitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this rotation was vulnerable to soil‐water deficits”
t0“Corn”
Claim · model-written summary
Corn following soybean in a four-year rotation yielded more grain than other rotations in three of four years.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- following soybean in a 4‐yr rotatione0
- Outcome
- graine0
- Direction
- moree0
- Qualifier
- 3 of 4 yre0
- Comparator
- other rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 3 of 4 yr, corn following soybean in a 4‐yr rotation produced more grain than other rotations”
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