Abstract
Abstract While corn ( Zea mays L.)‐soybean ( Glycine max . Merr. L) is a predominant rotation system in the US Midwest the residual effect of nitrogen (N) fertilization to corn on the following year's soybean and N 2 O emissions under different soil drainage conditions has not been studied. Our objective was to quantify agronomic parameters and season‐long N 2 O emissions from soybean as affected by N management (0‐N and optimum N rate of 135 kg N ha −1 as single or split application) during the previous corn crop under drained and undrained systems. Urea was applied to corn, and residual N effects were measured on soybean the following year in a poorly drained soil with and without subsurface tile drainage. Drainage reduced N 2 O emissions in one of three growing seasons but had no effect on soybean yield or N removal in grain. Nitrogen management in the previous corn crop had no effect on soybean grain yield, N removal, or N 2 O emissions during the soybean phase. Even though soybean symbiotically fixes N and removes more N in grain than corn, N 2 O emissions were more than two times greater during the corn phase (mean = 1.83 kg N ha −1 ) due to N fertilization than during the soybean phase (mean = 0.80 kg N ha −1 ). Also, N 2 O emissions in the corn years were increased possibly due to decomposition of the previous year's soybean crop residue compared to corn residue decomposition in the soybean years. Tile drainage, especially where wet soil conditions are prevalent, is a viable option to mitigate agricultural N 2 O emissions.
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Claims 6
Claim · model-written summary
Drainage reduced nitrous oxide emissions in one of three seasons.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Drainagee0
- Outcome
- N 2 O emissionse0
- Direction
- reducede0
- Qualifier
- one of three growing seasonse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drainage reduced N 2 O emissions in one of three growing seasons”
t0“soybean”
Claim · model-written summary
Drainage had no effect on soybean yield or grain nitrogen removal.
- Taxon
- soybeanGlycine maxe0
- Treatment
- drained and undrained soilst0
- Outcome
- soybean yield or N removal in graine0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had no effect on soybean yield or N removal in grain”
t0“drained and undrained soils”
Claim · model-written summary
Prior-corn nitrogen management had no effect on soybean grain yield, grain nitrogen removal, or soybean-phase nitrous oxide emissions.
- Taxon
- soybeanGlycine maxe0
- Treatment
- Nitrogen management in the previous corn crope0
- Outcome
- soybean grain yield, N removal, or N 2 O emissionse0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen management in the previous corn crop had no effect on soybean grain yield, N removal, or N 2 O emissions during the soybean phase.”
Claim · model-written summary
Corn-phase nitrous oxide emissions were more than twice soybean-phase emissions, with means of 1.83 versus 0.80 kg N ha −1.
- Taxon
- corn
Zea mays subsp. mayst0 - Outcome
- N 2 O emissionse0
- Direction
- more than two times greatere0
- Value
- 1.83 kg N ha −1e0
- Qualifier
- 0.80 kg N ha −1e0
- Comparator
- soybean phasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 2 O emissions were more than two times greater during the corn phase (mean = 1.83 kg N ha −1 ) due to N fertilization than during the soybean phase (mean = 0.80 kg N ha −1 )”
t0“corn”
Claim · model-written summary
The authors suggest soybean residue decomposition may have increased corn-year nitrous oxide emissions relative to corn-residue decomposition in soybean years.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- N 2 O emissionse0
- Direction
- increasede0
- Qualifier
- possibly due to decomposition of the previous year's soybean crop residuee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N 2 O emissions in the corn years were increased possibly due to decomposition of the previous year's soybean crop residue compared to corn residue decomposition in the soybean years”
t0“corn”
Claim · model-written summary
The authors recommend tile drainage to mitigate agricultural nitrous oxide emissions where soils are wet.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Tile drainagee0
- Outcome
- mitigate agricultural N 2 O emissionse0
- Qualifier
- where wet soil conditions are prevalente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tile drainage, especially where wet soil conditions are prevalent, is a viable option to mitigate agricultural N 2 O emissions.”
t0“soybean”
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