Abstract
ABSTRACT No-tillage systems are used to control soil erosion and water runoff on sloping cropland, but these systems, which rely heavily on herbicides and commercial fertilizers, may contribute to nutrient and herbicide contamination of water, air, and other ecosystems. This study simulated the long-term economic and environmental impacts of using alternative grain production systems for control of soil erosion and/or reducing chemical inputs. The EPIC (Environmental Policy Integrated Climate) biological process simulation model was used to simulate crop yields, soil erosion, herbicide losses, nitrogen and phosphorus losses, and economic returns for six cropping systems over a 60-year period. The simulation results indicated that average gross margins were highest for a cover crop-based, no-tillage system corn/soybean (Zea mays L./Glycine max L. Mer.) rotation with zero preplant fertilizer nitrogen inputs (US$322/ha), a no-tillage corn/soybean rotation with recommended inputs (US$314/ha), and a two-year organic corn/wheat (Triticum aestirum L.)/soybean rotation (US$301/ha). In term of simulated environmental impacts, the cover crop-based system with zero fertilizer nitrogen inputs produced less soil erosion, nitrogen loss, and herbicide loss than systems employing recommended inputs. The organic two-year rotation also produced lower nitrogen loss than either recommended system but produced the highest phosphorus loss and the second highest level of soil erosion.
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Claims 7
Claim · model-written summary
A cover crop-based no-tillage corn/soybean rotation with zero preplant nitrogen had the highest average gross margin of US$322/ha.
- Taxon
- corn/soybean
Glycine max
Zea mays subsp. mayse0 - Treatment
- zero preplant fertilizer nitrogen inputse0
- Outcome
- average gross marginse0
- Direction
- higheste0
- Value
- US$322/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“average gross margins were highest for a cover crop-based, no-tillage system corn/soybean (Zea mays L./Glycine max L. Mer.) rotation with zero preplant fertilizer nitrogen inputs (US$322/ha)”
Claim · model-written summary
A no-tillage corn/soybean rotation with recommended inputs had a high average gross margin of US$314/ha.
- Taxon
- corn/soybeanGlycine maxZea mays subsp. mayse0
- Treatment
- recommended inputse0
- Outcome
- gross marginse1
- Value
- US$314/hae0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a no-tillage corn/soybean rotation with recommended inputs (US$314/ha)”
e1“average gross margins were highest”
Claim · model-written summary
A two-year organic corn/wheat/soybean rotation had a high average gross margin of US$301/ha.
- Taxon
- corn/wheat
Triticum aestivumZea mays subsp. mayse0 - Treatment
- organice0
- Value
- US$301/hae0
Not reportedOutcome
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a two-year organic corn/wheat (Triticum aestirum L.)/soybean rotation (US$301/ha)”
Claim · model-written summary
The zero-nitrogen cover crop system produced less soil erosion, nitrogen loss and herbicide loss than recommended-input systems.
- Taxon
- corn/soybeanGlycine maxZea mays subsp. mayse1
- Treatment
- cover crop-based system with zero fertilizer nitrogen inputse0
- Outcome
- soil erosion, nitrogen loss, and herbicide losse0
- Direction
- lesse0
- Comparator
- systems employing recommended inputse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the cover crop-based system with zero fertilizer nitrogen inputs produced less soil erosion, nitrogen loss, and herbicide loss than systems employing recommended inputs”
e1“no-tillage system corn/soybean (Zea mays L./Glycine max L. Mer.) rotation”
Claim · model-written summary
The organic two-year rotation had lower nitrogen loss than either recommended system.
- Taxon
- corn/wheatTriticum aestivumZea mays subsp. mayse1
- Treatment
- organic two-year rotatione0
- Outcome
- nitrogen losse0
- Direction
- lowere0
- Comparator
- either recommended systeme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The organic two-year rotation also produced lower nitrogen loss than either recommended system”
e1“organic corn/wheat (Triticum aestirum L.)/soybean rotation”
Claim · model-written summary
The organic two-year rotation produced the highest phosphorus loss.
- Taxon
- corn/wheatTriticum aestivumZea mays subsp. mayse1
- Treatment
- organic two-year rotatione0
- Outcome
- phosphorus losse0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The organic two-year rotation also produced lower nitrogen loss than either recommended system but produced the highest phosphorus loss and the second highest level of soil erosion.”
e1“organic corn/wheat (Triticum aestirum L.)/soybean rotation”
Claim · model-written summary
The organic two-year rotation produced the second highest soil erosion.
- Taxon
- corn/wheatTriticum aestivumZea mays subsp. mayse1
- Treatment
- organic two-year rotatione0
- Outcome
- soil erosione0
- Direction
- second higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The organic two-year rotation also produced lower nitrogen loss than either recommended system but produced the highest phosphorus loss and the second highest level of soil erosion.”
e1“organic corn/wheat (Triticum aestirum L.)/soybean rotation”
The same questions in other papers
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- no effect
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See all 93 papers →nitrogen · soil: physics · Glycine max (soybean)Results agree
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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.