Abstract
Abstract Fall application of N for corn [Zea mays (L)] on clay pan soils in northeastern Missouri has not become an accepted practice as wet soils conductive to denitrification often delays corn plantings. Since nitrification inhibitors have the potential to reduce denitrification loss of fall applied N, a 4‐year study (1979–82) was conducted on a Mollic Albaqualf soil, subject to excessive spring wetness and representative of the corn growing region in northeastern Missouri to study the effect of the nitrification inhibitor, nitrapyrin, on fall and spring applied anhydrous ammonia. A randomized block design with 4 replications was employed using 0, 56, 112, 168 and 224 kg N/ha as anhydrous ammonia applied fall and spring with and without 0.56 kg/ha of nitrapyrin. Measurements included grain yield, leaf N and grain protein. The second year, 1980, high day and night temperatures and July rainfall 118 mm below normal eliminated any response due to N and nitrapyrin treatments. Grain yield, leaf N and grain protein followed typical response to applied N. Lack of response to fertilizer N in 1979 was attributed to residual soil N after four previous croppings of soybeans, and lack of response to N in 1981 is attributed to residual fertilizer N because of drought induced low yields of 1980. Percent grain protein was a function of N rate and was not consistently related to leaf N, and therefore, not influenced by nitrapyrin. From 15% to 18% less fertilizer N would be required for yield maximization by including nitrapyrin in the fall application, with 3.2 to 4.7% less fertilizer N required with the spring application. Fertilizer N required for yield maximization with N fall applied with nitrapyrin was calculated to be the same as N spring applied with nitrapyrin and less than the N spring applied without nitrapyrin. Results from this study indicate fall application of N as anhydrous ammonia with nitrapyrin would permit higher plant N use efficiency on this claypan soil.
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Claims 10
Claim · model-written summary
1980 drought and heat eliminated nitrogen and nitrapyrin responses.
- Taxon
- corn
Zea mays subsp. mayst0 - Outcome
- response due to N and nitrapyrin treatmentse0
- Qualifier
- July rainfall 118 mm below normale0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high day and night temperatures and July rainfall 118 mm below normal eliminated any response due to N and nitrapyrin treatments.”
t0“corn”
Claim · model-written summary
Grain yield, leaf N and grain protein responded typically to applied N.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- applied Ne0
- Outcome
- Grain yield, leaf N and grain proteine0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield, leaf N and grain protein followed typical response to applied N.”
t0“corn”
Claim · model-written summary
Grain protein depended on nitrogen rate.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- N ratee0
- Outcome
- Percent grain proteine0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Percent grain protein was a function of N rate”
t0“corn”
Claim · model-written summary
Grain protein was not consistently related to leaf nitrogen.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Percent grain proteine1
- Qualifier
- leaf Ne0
- Comparator
- leaf Ne0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was not consistently related to leaf N”
e1“Percent grain protein was a function of N rate”
t0“corn”
Claim · model-written summary
Nitrapyrin did not influence grain protein.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nitrapyrine0
- Outcome
- Percent grain proteine1
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“therefore, not influenced by nitrapyrin.”
e1“Percent grain protein was a function of N rate”
t0“corn”
Claim · model-written summary
Fall nitrapyrin reduced fertilizer nitrogen needed for maximum yield by 15% to 18%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- including nitrapyrin in the fall applicatione0
- Outcome
- fertilizer N would be required for yield maximizatione0
- Direction
- lesse0
- Value
- 15% to 18%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From 15% to 18% less fertilizer N would be required for yield maximization by including nitrapyrin in the fall application”
t0“corn”
Claim · model-written summary
Spring nitrapyrin reduced fertilizer nitrogen needed by 3.2 to 4.7%.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- spring applicatione0
- Outcome
- fertilizer N requirede0
- Direction
- lesse0
- Value
- 3.2 to 4.7%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with 3.2 to 4.7% less fertilizer N required with the spring application.”
t0“corn”
Claim · model-written summary
Maximum-yield nitrogen requirement was equal for fall and spring applications with nitrapyrin.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Fertilizer N required for yield maximizatione0
- Direction
- the samee0
- Comparator
- N spring applied with nitrapyrine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilizer N required for yield maximization with N fall applied with nitrapyrin was calculated to be the same as N spring applied with nitrapyrin”
t0“corn”
Claim · model-written summary
Fall nitrogen with nitrapyrin required less nitrogen than spring nitrogen without nitrapyrin.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- Fertilizer N required for yield maximizatione1
- Direction
- less thane0
- Comparator
- N spring applied without nitrapyrine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“less than the N spring applied without nitrapyrin.”
e1“Fertilizer N required for yield maximization with N fall applied with nitrapyrin was calculated to be the same as N spring applied with nitrapyrin”
t0“corn”
Claim · model-written summary
Fall anhydrous ammonia with nitrapyrin was interpreted to increase plant nitrogen use efficiency.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- fall application of N as anhydrous ammonia with nitrapyrine0
- Setting
- this claypan soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fall application of N as anhydrous ammonia with nitrapyrin would permit higher plant N use efficiency on this claypan soil.”
t0“corn”
The same questions in other papers
nitrapyrin · quality: protein · Zea mays (maize)Results differ
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →nitrapyrin · yield · Zea mays (maize)Results differ
33 papers in the same direction as this paper · 9 in the opposite direction
- negative
- positive
- positive
39 papers more in this group
See all 43 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.