Abstract
Variability in N fertilizer requirements for corn (Zea mays L.) following soybean [ Glycine max (L.) Merr.] across sites and years emphasizes the need to understand management practice effects on apparent soybean N contributions. This study was conducted to determine the effects of three soybean harvest management systems (HMS) and tillage on subsequent corn grain yields, and apparent soybean N contributions. Field experiments to evaluate the effects of returning or removing soybean residue, soybean forage harvest at the R6 growth stage, and applied N (0–180 kg N ha −1 ) on corn grain yields were conducted for 3 yr at four locations. The soybean residue returned treatment significantly decreased yields by 1.1 and 2.5 Mg ha −1 for 2 of 12 site years. The soybean residue returned treatment also required 134, 41, and 87 kg ha −1 more fertilizer N to maximize yields for 3 of 12 site years, but not at the remaining sites. Greater early season soil NO 3 –N in the forage harvested or residue removed treatments before planting and when corn plants were 30 cm tall (presidedress) is probably a result of warmer soil temperatures and increased soil N mineralization where residue was removed. Economic optimum N rates for corn following soybean varied substantially across sites and years and ranged from 0 to 180 kg N ha −1 but were not greatly affected by soybean HMS or tillage at most sites. This work emphasizes the need for a field‐specific approach to better predict the apparent soybean N contribution to a subsequent corn crop.
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Claims 7
Claim · model-written summary
Returning soybean residue significantly decreased corn yields by 1.1 and 2.5 Mg ha −1 in two of twelve site-years.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- soybean residue returned treatmente0
- Outcome
- yieldse0
- Direction
- decreasede0
- Value
- 1.1 and 2.5 Mg ha −1e0
- Qualifier
- 2 of 12 site yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soybean residue returned treatment significantly decreased yields by 1.1 and 2.5 Mg ha −1 for 2 of 12 site years.”
t0“Corn Yields”
Claim · model-written summary
Returning soybean residue required more fertilizer N to maximize yield in three of twelve site-years.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- soybean residue returned treatmente0
- Outcome
- fertilizer N to maximize yieldse0
- Direction
- moree0
- Value
- 134, 41, and 87 kg ha −1e0
- Qualifier
- 3 of 12 site years, but not at the remaining sitese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soybean residue returned treatment also required 134, 41, and 87 kg ha −1 more fertilizer N to maximize yields for 3 of 12 site years, but not at the remaining sites.”
t0“Corn Yields”
Claim · model-written summary
Soil nitrate was greater after soybean forage harvest or residue removal before planting and when corn was 30 cm tall.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- forage harvested or residue removed treatmentse0
- Outcome
- soil NO 3 –Ne0
- Direction
- Greatere0
- Qualifier
- before planting and when corn plants were 30 cm tall (presidedress)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater early season soil NO 3 –N in the forage harvested or residue removed treatments before planting and when corn plants were 30 cm tall (presidedress)”
t0“Corn Yields”
Claim · model-written summary
The authors attribute greater soil nitrate after residue removal to warmer soils and N mineralization.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- residue was removede0
- Outcome
- soil NO 3 –Ne0
- Qualifier
- probably a result of warmer soil temperatures and increased soil N mineralizatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Greater early season soil NO 3 –N in the forage harvested or residue removed treatments before planting and when corn plants were 30 cm tall (presidedress) is probably a result of warmer soil temperatures and increased soil N mineralization where residue was removed.”
t0“Corn Yields”
Claim · model-written summary
Economic optimum N rates varied across sites and years from 0 to 180 kg N ha −1.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Economic optimum N ratese0
- Direction
- varied substantiallye0
- Value
- 0 to 180 kg N ha −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Economic optimum N rates for corn following soybean varied substantially across sites and years and ranged from 0 to 180 kg N ha −1”
Claim · model-written summary
Soybean harvest management or tillage did not greatly affect optimum N rates at most sites.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- soybean HMS or tillagee0
- Outcome
- Economic optimum N ratese1
- Direction
- not greatly affectede0
- Qualifier
- at most sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“but were not greatly affected by soybean HMS or tillage at most sites.”
e1“Economic optimum N rates for corn following soybean”
Claim · model-written summary
The authors recommend a field-specific approach to predicting soybean N contributions to corn.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- field‐specific approach to better predict the apparent soybean N contributione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This work emphasizes the need for a field‐specific approach to better predict the apparent soybean N contribution to a subsequent corn crop.”
The same questions in other papers
Glycine max · yield · Zea mays (maize)Positive and negative results
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- positive
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See all 180 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.