Abstract
Crop rotation influences yield through its effects on nutrient and pest cycles, soil C, water availability, and soil physical and chemical properties. A cropping system study was conducted from 2004 to 2008 near Brunswick, NE, on sandy loam (Haplustolls) soils to evaluate improvements of irrigated corn (Zea mays L.) yield and N use efficiency (NUE) when following soybean [Glycine max (L.) Merr.] in 2 yr as corn following soybean (CS) or in 3 yr as first-year corn following soybean (C1) and second-year corn following soybean (C2) compared with continuous corn (CC). SPAD readings at V10 and R2 were approximately 3 to 4% greater in CS than CC, indicating more in-season N availability. Corn grain yield of CS (12.1 Mg ha−1) was 20% greater than CC (10.1 Mg ha−1), with 69 and 57% greater NUE and N recovery efficiency, respectively. At zero N applied, corn harvest index was 15% greater in CS with 37% increased plant N uptake at harvest compared with CC. In CS, fertilizer replacement value estimated soybean N credits of 66 and 49 kg N ha−1 based on grain yield and plant N uptake, respectively. The difference in N rates needed to produce maximum grain yield of CS vs. CC was estimated at 32 kg ha−1 soybean N credit. The average soybean N credit was 49, 41, and 26 kg N ha−1 for the corn in CS, C1, and C2, respectively. Both the 2- and 3-yr corn–soybean rotations on loamy sand soils improved corn yield and NUE.
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Claims 13
Claim · model-written summary
SPAD readings were 3 to 4% greater in CS than CC.
- Taxon
- corn
Zea mays subsp. mayst0 - Organ / stage
- V10 and R2e0
- Treatment
- CSe0
- Outcome
- SPAD readingse0
- Direction
- greatere0
- Value
- 3 to 4%e0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“SPAD readings at V10 and R2 were approximately 3 to 4% greater in CS than CC, indicating more in-season N availability.”
t0“Corn”
Claim · model-written summary
CS grain yield was 12.1 Mg ha−1, 20% greater than CC.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- CSe0
- Outcome
- grain yielde0
- Direction
- greatere0
- Value
- 20%e0
- Qualifier
- 10.1 Mg ha−1e0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain yield of CS (12.1 Mg ha−1) was 20% greater than CC (10.1 Mg ha−1), with 69 and 57% greater NUE and N recovery efficiency, respectively.”
Claim · model-written summary
CS increased NUE by 69% versus CC.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain yield of CS (12.1 Mg ha−1) was 20% greater than CC (10.1 Mg ha−1), with 69 and 57% greater NUE and N recovery efficiency, respectively.”
t0“Corn following Soybean in Irrigated Sandy Loams”
Claim · model-written summary
CS increased N recovery efficiency by 57% versus CC.
- Taxon
- CornZea mays subsp. mayse0
- Treatment
- CSe0
- Outcome
- N recovery efficiencye0
- Direction
- greatere0
- Value
- 57%e0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn grain yield of CS (12.1 Mg ha−1) was 20% greater than CC (10.1 Mg ha−1), with 69 and 57% greater NUE and N recovery efficiency, respectively.”
t0“Corn following Soybean in Irrigated Sandy Loams”
Claim · model-written summary
At zero N, CS corn harvest index was 15% greater than CC.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CSe0
- Outcome
- harvest indexe0
- Direction
- greatere0
- Value
- 15%e0
- Qualifier
- zero N appliede0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At zero N applied, corn harvest index was 15% greater in CS with 37% increased plant N uptake at harvest compared with CC.”
Claim · model-written summary
At zero N, CS plant N uptake was 37% greater than CC.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- CSe0
- Outcome
- plant N uptake at harveste0
- Direction
- increasede0
- Value
- 37%e0
- Qualifier
- zero N appliede0
- Comparator
- CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At zero N applied, corn harvest index was 15% greater in CS with 37% increased plant N uptake at harvest compared with CC.”
Claim · model-written summary
The yield based soybean N credit for CS was 66 kg N ha−1.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- soybean N creditse0
- Value
- 66 and 49 kg N ha−1e0
- Qualifier
- based on grain yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In CS, fertilizer replacement value estimated soybean N credits of 66 and 49 kg N ha−1 based on grain yield and plant N uptake, respectively.”
t0“Corn following Soybean in Irrigated Sandy Loams”
Claim · model-written summary
The plant uptake based soybean N credit for CS was 49 kg N ha−1.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- soybean N creditse0
- Value
- 49 kg N ha−1e0
- Qualifier
- plant N uptakee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In CS, fertilizer replacement value estimated soybean N credits of 66 and 49 kg N ha−1 based on grain yield and plant N uptake, respectively.”
t0“Corn following Soybean in Irrigated Sandy Loams”
Claim · model-written summary
Maximum yield N rate differences implied a 32 kg ha−1 soybean N credit.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- soybean N credite0
- Value
- 32 kg ha−1e0
- Comparator
- CS vs. CCe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference in N rates needed to produce maximum grain yield of CS vs. CC was estimated at 32 kg ha−1 soybean N credit.”
t0“Corn following Soybean in Irrigated Sandy Loams”
Claim · model-written summary
The average soybean N credit was 49 kg N ha−1 for CS.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- soybean N credite0
- Value
- 49, 41, and 26 kg N ha−1e0
- Qualifier
- CSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average soybean N credit was 49, 41, and 26 kg N ha−1 for the corn in CS, C1, and C2, respectively.”
Claim · model-written summary
The average soybean N credit was 41 kg N ha−1 for C1.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- soybean N credite0
- Value
- 49, 41, and 26 kg N ha−1e0
- Qualifier
- C1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average soybean N credit was 49, 41, and 26 kg N ha−1 for the corn in CS, C1, and C2, respectively.”
Claim · model-written summary
The average soybean N credit was 26 kg N ha−1 for C2.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- soybean N credite0
- Value
- 49, 41, and 26 kg N ha−1e0
- Qualifier
- C2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The average soybean N credit was 49, 41, and 26 kg N ha−1 for the corn in CS, C1, and C2, respectively.”
Claim · model-written summary
Both two and three year corn–soybean rotations improved corn yield and NUE.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 2- and 3-yr corn–soybean rotationse0
- Outcome
- corn yield and NUEe0
- Direction
- improvede0
- Setting
- loamy sand soilse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both the 2- and 3-yr corn–soybean rotations on loamy sand soils improved corn yield and NUE.”
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3 papers in the same direction as this paper
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1 paper in the same direction as this paper · 1 in the opposite direction
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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.