Abstract
Abstract Preplant N fertilizer applications on sandy Coastal Plain soils are often less efficient than sidedress N applications due to leaching of NO − 3 from the rhizosphere. Preplant‐incorporated broadcast applications of ammoniacal N fertilizers containing the nitrification inhibitor nitrapyrin [2‐chloro‐6(trichloromethyl)pyridine] should increase utilization of the exchange capacity of sandy soils to retain NH + 4 and increase preplant N fertilizer efficiency. The effects of N rate, N source, and nitrapyrin on inorganic soil N form, soil N content, and corn ( Zea mays L.) growth were investigated in 1977 on a Marlboro sand (Typic Paleudult) and a Varina loamy sand (Plinthic Paleudult) and in 1978 on a Wagram sand (Arenic Paleudult). Nitrogen treatments consisted of a zero‐N check, preplant broadcast applications of 56, 112, 168, and 224 kg N/ha as urea, 112 kg N/ha as NaNO 3 , and 112 kg N/ha as urea plus 1.12 kg nitrapyrin/ha dissolved in water. Soil N measurements at 34, 40, and 48 days after N treatment application on the Marlboro, Varina and Wagram soils, respectively, showed that nitrification was suppressed by nitrapyrin. The lack of significant differences in inorganic soil N contents in the 0 to 15 cm depth among 112 kg N/ha supplied as urea with and without nitrapyrin and NaNO 3 indicated that little leaching occurred in 1977. Leaching conditions in 1978 resulted in large losses of inorganic N from the rooting zone; however, when nitrapyrin was added with urea, losses of N were significantly reduced. High N rates from urea decreased the pH in all soils except when nitrapyrin was included. In 1977, inclusion of nitrapyrin with urea had little effect on leaf N, grain yields, plant N accumulation or N fertilizer recovery due to small losses of soil inorganic N. However, in 1978 when leaching conditions occurred, nitrapyrin with urea decreased soil N losses, significantly increased leaf N concentration, grain yields, plant N accumulation and N fertilizer recovery.
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Claims 10
Claim · model-written summary
Nitrapyrin suppressed soil nitrification.
- Taxon
- corn
Zea mays subsp. mayst0 - Treatment
- nitrapyrine0
- Outcome
- nitrificatione0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrification was suppressed by nitrapyrin”
t0“Corn”
Claim · model-written summary
In 1977 inorganic soil nitrogen contents did not differ significantly among nitrogen sources.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- inorganic soil N contentse0
- Setting
- 0 to 15 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lack of significant differences in inorganic soil N contents in the 0 to 15 cm depth among 112 kg N/ha supplied as urea with and without nitrapyrin and NaNO 3”
t0“Corn”
Claim · model-written summary
Leaching in 1978 caused large inorganic nitrogen losses from the rooting zone.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- losses of inorganic N from the rooting zonee0
- Direction
- large lossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaching conditions in 1978 resulted in large losses of inorganic N from the rooting zone”
t0“Corn”
Claim · model-written summary
Adding nitrapyrin to urea significantly reduced nitrogen losses under 1978 leaching.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nitrapyrin was added with ureae0
- Outcome
- losses of Ne0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when nitrapyrin was added with urea, losses of N were significantly reduced”
t0“Corn”
Claim · model-written summary
High urea nitrogen rates decreased soil pH except when nitrapyrin was included.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- High N rates from ureae0
- Outcome
- pHe0
- Direction
- decreasede0
- Qualifier
- except when nitrapyrin was includede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High N rates from urea decreased the pH in all soils except when nitrapyrin was included”
t0“Corn”
Claim · model-written summary
In 1977 nitrapyrin had little effect on leaf nitrogen and plant nitrogen accumulation.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- inclusion of nitrapyrin with ureae0
- Outcome
- leaf N, grain yields, plant N accumulatione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1977, inclusion of nitrapyrin with urea had little effect on leaf N, grain yields, plant N accumulation or N fertilizer recovery”
t0“Corn”
Claim · model-written summary
In 1977 nitrapyrin had little effect on grain yield and nitrogen fertilizer recovery.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- inclusion of nitrapyrin with ureae0
- Outcome
- grain yields, plant N accumulation or N fertilizer recoverye0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 1977, inclusion of nitrapyrin with urea had little effect on leaf N, grain yields, plant N accumulation or N fertilizer recovery”
t0“Corn”
Claim · model-written summary
In 1978 nitrapyrin significantly increased corn leaf nitrogen concentration.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nitrapyrin with ureae0
- Outcome
- leaf N concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrapyrin with urea decreased soil N losses, significantly increased leaf N concentration, grain yields, plant N accumulation and N fertilizer recovery”
t0“Corn”
Claim · model-written summary
In 1978 nitrapyrin significantly increased corn grain yields.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nitrapyrin with ureae0
- Outcome
- grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrapyrin with urea decreased soil N losses, significantly increased leaf N concentration, grain yields, plant N accumulation and N fertilizer recovery”
t0“Corn”
Claim · model-written summary
In 1978 nitrapyrin significantly increased plant nitrogen accumulation and fertilizer recovery.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- nitrapyrin with ureae0
- Outcome
- plant N accumulation and N fertilizer recoverye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrapyrin with urea decreased soil N losses, significantly increased leaf N concentration, grain yields, plant N accumulation and N fertilizer recovery”
t0“Corn”
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