Abstract
ABSTRACT This study was conducted to formulate an in-season nitrogen (N) fertilization optimization algorithm (NFOA) to estimate midseason N rates that maximize corn (Zea mays L.) growth and minimize fertilizer inputs. Treatments included: a zero kg N ha−1; three treatments of 134 kg N ha−1 fixed rate applied in split, preplant, or sidedress; two treatments of 67 kg N ha−1 fixed rate preplant or sidedress applied; three NFOA-based midseason N rates (RI-NFOA, RICV-NFOA, flat-RICV-NFOA) with (67 kg N ha−1) and without preplant N; and two resolutions (0.34 and 2.32 m2) tested for RICV-NFOA only. With the 67 kg N ha−1 preplant application, midseason RI-NFOA-based N rates resulted in an N use efficiency (NUE) of 65% while the 134 kg N ha−1 fixed rate split applied had 56% NUE. Using the RICV-NFOA, NUE and net returns to N fertilizer were higher when spatial variability was treated at 2.32 m2 resolution.
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Claims 4
Claim · model-written summary
The RI-NFOA midseason rate after 67 kg N ha−1 preplant nitrogen achieved 65% NUE.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- 67 kg N ha−1 preplant applicatione0
- Outcome
- N use efficiency (NUE)e0
- Value
- 65%e0
- Comparator
- 134 kg N ha−1 fixed rate split appliede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the 67 kg N ha−1 preplant application, midseason RI-NFOA-based N rates resulted in an N use efficiency (NUE) of 65%”
e1“while the 134 kg N ha−1 fixed rate split applied had 56% NUE”
t0“corn”
Claim · model-written summary
The 134 kg N ha−1 split fixed rate achieved 56% NUE.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- 134 kg N ha−1 fixed rate split appliede0
- Outcome
- NUEe0
- Value
- 56%e0
- Comparator
- RI-NFOA-based N ratese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while the 134 kg N ha−1 fixed rate split applied had 56% NUE”
e1“midseason RI-NFOA-based N rates”
t0“corn”
Claim · model-written summary
At 2.32 m2 resolution, RICV-NFOA produced higher NUE.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the RICV-NFOA, NUE and net returns to N fertilizer were higher when spatial variability was treated at 2.32 m2 resolution.”
e1“two resolutions (0.34 and 2.32 m2) tested for RICV-NFOA only”
t0“corn”
Claim · model-written summary
At 2.32 m2 resolution, RICV-NFOA produced higher net returns to N fertilizer.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- net returns to N fertilizere0
- Direction
- highere0
- Value
- 2.32 m2e0
- Comparator
- 0.34e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Using the RICV-NFOA, NUE and net returns to N fertilizer were higher when spatial variability was treated at 2.32 m2 resolution.”
e1“two resolutions (0.34 and 2.32 m2) tested for RICV-NFOA only”
t0“corn”