Abstract
Fertilizer application technology has improved fertilizer use efficiency in ridge-till systems, but little work on planting methods and application timing within these systems has been done. A study was conducted to evaluate corn (Zea mays 1.) response to injected nitrogen (N) fertilizer applied to different planting methods at common application times. The performance of the late spring soil nitrate and the basal stalk nitrate tests was examined within these systems. A continuous corn and a corn-soybean [Glycine max (1) Merr.] rotation were used in 1989-1991 at two Iowa locations on Nicolett and Monona series soils, line-loamy, mixed, mesic Typic Hapludolls and line-silty, mixed, mesic Typic Hapludolls, respectively. Whole plot treatments were: 1) till planting with fertilizer N applied at layby; 2) slot planting with fertilizer N applied at planting; and 3) slot planting with fertilizer N applied at layby. Subplot treatments (0, 22, 45, 90, 157, and 224 kg N ha-1) were imposed on the whole-plots. The late spring soil nitrate test had consistently low values relative to the scale used for N fertilizer recommendations. The basal stalk nitrate test identified optima nitrate concentrations relating to N fertilizer rates which produced maximum yields. Whole plot treatments generally did not differ significantly in grain yield. Alternative methods of fertilizing corn, such as the use of point injection application equipment, provide opportunities in fertilizer N management that current recommendation tools may enhance.
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Claims 4
Claim · model-written summary
The late spring soil nitrate test had consistently low values relative to the fertilizer recommendation scale.
- Taxon
- Corn
Zea mays subsp. mayst0 - Outcome
- late spring soil nitrate teste0
- Direction
- lowe0
- Comparator
- the scale used for N fertilizer recommendationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The late spring soil nitrate test had consistently low values relative to the scale used for N fertilizer recommendations.”
Claim · model-written summary
The basal stalk nitrate test identified optimum nitrate concentrations associated with rates producing maximum corn yields.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- basal stalk nitrate teste0
- Value
- maximum yieldse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“The basal stalk nitrate test identified optima nitrate concentrations relating to N fertilizer rates which produced maximum yields.”
Claim · model-written summary
Whole plot planting and fertilization treatments generally did not differ significantly in corn grain yield.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Whole plot treatmentse0
- Outcome
- grain yielde0
- Direction
- did not differe0
- Comparator
- Whole plot treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Whole plot treatments generally did not differ significantly in grain yield.”
Claim · model-written summary
Point injection application equipment may offer opportunities for improved fertilizer nitrogen management.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- point injection application equipmente0
- Outcome
- opportunities in fertilizer N managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Alternative methods of fertilizing corn, such as the use of point injection application equipment, provide opportunities in fertilizer N management that current recommendation tools may enhance.”