Abstract
Abstract Studies have indicated that, by maintaining relatively high solution culture or soil NH + 4 /NO ‐ 3 ratios during the reproductive growth stage, certain corn ( Zea mays L.) genotypes have a higher yield potential. Unfortunately, few data on soil NH + 4 and NO ‐ 3 levels have been reported. A 3‐yr field experiment was conducted in northeastern Kansas in 1987, 1988, and 1989 to evaluate the effects of time and form of applied N on fertilizer band NH + 4 /NO ‐ 3 ratios and on the N nutrition, dry‐matter accumulation, and grain yield of two corn hybrids. Urea, urea‐NH 4 NO 3 , urea plus Ca(NO 3 ) 2 , NH 4 NO 3 , and Ca(NO 3 ) 2 solutions having NH + 4 /NO ‐ 3 ratios of 1:0, 3:1, 1:1, 1:1, and 0:1, respectively, were used at equivalent N rates. The nitrification inhibitors, nitrapyrin [2‐chloro‐6‐(trichloromethyl) pyridine] and dicyandiamide, as well as two‐way and three‐way timing of application schemes were used to maintain N as NH + 4 . Split applications of ammoniacal N with a nitrification inhibitor were effective in maintaining elevated soil NH + 4 concentrations from planting through early grain fill. In 1988 only, grain yield was increased slightly (3–9% higher) when corn was fertilized with ammoniacal N compared with NO ‐ 3 only. Overall, manipulation of soil NH + 4 /NO ‐ 3 ratios had few effects on corn development or yield.
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Claims 3
Claim · model-written summary
In 1988, corn fertilized with ammoniacal N yielded slightly more grain (3–9% higher) than with NO3 only.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- ammoniacal Ne1
- Outcome
- grain yielde1
- Direction
- increasede1
- Value
- 3–9% highere1
- Qualifier
- In 1988 onlye1
- Comparator
- NO ‐ 3 onlye1
- Setting
- northeastern Kansase0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A 3‐yr field experiment was conducted in northeastern Kansas”
e1“In 1988 only, grain yield was increased slightly (3–9% higher) when corn was fertilized with ammoniacal N compared with NO ‐ 3 only”
Claim · model-written summary
Split applications of ammoniacal N with a nitrification inhibitor maintained elevated soil NH4+ concentrations from planting through early grain fill.
- Taxon
- cornZea mays subsp. mayse3
- Treatment
- Split applications of ammoniacal N with a nitrification inhibitore2
- Outcome
- soil NH + 4 concentrationse2
- Direction
- elevatede2
- Qualifier
- from planting through early grain fille2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Split applications of ammoniacal N with a nitrification inhibitor were effective in maintaining elevated soil NH + 4 concentrations from planting through early grain fill”
e3“Overall, manipulation of soil NH + 4 /NO ‐ 3 ratios had few effects on corn development or yield”
Claim · model-written summary
Manipulating soil NH4+/NO3- ratios had few effects on corn development or yield.
- Taxon
- cornZea mays subsp. mayse3
- Treatment
- manipulation of soil NH + 4 /NO ‐ 3 ratiose3
- Outcome
- corn development or yielde3
- Direction
- no_changeinferrede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Overall, manipulation of soil NH + 4 /NO ‐ 3 ratios had few effects on corn development or yield”
The same questions in other papers
nitric oxide · yield · Zea mays (maize)Positive and negative results
6 papers in the same direction as this paper · 4 in the opposite direction
- positive
- positive
- positive
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See all 11 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.