Abstract
Nitrapyrin [2‐chloro‐6‐(trichloromethyl) pyridine] is a nitrification inhibitor frequently used to prevent losses of N fertilizer during corn ( Zea Mays L.) production. Although many studies have shown that nitrapyrin inhibits nitrification in soils, it has not been established that use of nitrapyrin is cost effective for corn producers in the western portion of the Corn Belt. Field experiments were conducted at 18 site‐years from 1985 through 1987 to determine the effects of nitrapyrin on corn yields and recovery of spring‐applied fertilizer. Ammonium sulfate was broadcast at four rates (0, 50, 100, and 150 lb N/acre), with and without nitrapyrin, and replicated three times. 15 N‐labeled (NH 4 ) 2 SO 4 was substituted for unlabeled (NH 4 ) 2 SO 4 on subplots within yield plots at eight of the site‐years. Statistically significant ( P < 0.05) grain yield responses to fertilizer N were observed at 17 of the 18 site‐years. Nitrapyrin significantly increased yields only at two of the 72 rate‐site‐years. Nitrapyrin did not influence recovery of labeled N in grain at 22 of the 24 rate‐site‐years having labeled fertilizer. It decreased recovery at the two other rate‐site‐years. Nitrapyrin had no significant effect on recovery of labeled N in the soils 8 wk and 14 mo after application. The results suggest that use of nitrapyrin was not cost effective at any of the sites studied.
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Claims 6
Claim · model-written summary
Nitrapyrin significantly increased corn yields at only two of the 72 rate-site-years
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Nitrapyrine1
- Outcome
- yieldse1
- Direction
- increasede1
- Value
- two of the 72e1
- Comparator
- without nitrapyrine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e1“Nitrapyrin significantly increased yields only at two of the 72”
e2“with and without nitrapyrin”
Claim · model-written summary
Fertilizer N produced significant grain yield responses at 17 of 18 corn site-years
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- grain yield responses to fertilizer Ne3
- Value
- 17 of the 18e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e3“grain yield responses to fertilizer N were observed at 17 of the 18”
Claim · model-written summary
Nitrapyrin did not influence recovery of labeled N in grain at 22 of 24 rate-site-years
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nitrapyrine4
- Outcome
- recovery of labeled N in graine4
- Direction
- no_changeinferrede4
- Value
- 22 of the 24e4
- Comparator
- without nitrapyrine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e2“with and without nitrapyrin”
e4“Nitrapyrin did not influence recovery of labeled N in grain at 22 of the 24”
Claim · model-written summary
Nitrapyrin decreased recovery of labeled N at the two other rate-site-years
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nitrapyrine4
- Outcome
- recoverye5
- Direction
- decreasede5
- Comparator
- without nitrapyrine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e2“with and without nitrapyrin”
e4“Nitrapyrin did not influence recovery of labeled N in grain at 22 of the 24”
e5“It decreased recovery at the two other”
Claim · model-written summary
Nitrapyrin had no significant effect on labeled N recovery in soils 8 weeks and 14 months after application
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Nitrapyrine6
- Outcome
- recovery of labeled N in the soilse6
- Direction
- no_changeinferrede6
- Qualifier
- 8 wk and 14 mo after applicatione6
- Comparator
- without nitrapyrine2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e2“with and without nitrapyrin”
e6“Nitrapyrin had no significant effect on recovery of labeled N in the soils 8 wk and 14 mo after application”
Claim · model-written summary
Nitrapyrin use was not cost effective for corn producers at any of the sites studied
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- not cost effectivee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“fertilizer during corn ( Zea Mays L.) production”
e7“The results suggest that use of nitrapyrin was not cost effective at any of the sites studied”
The same questions in other papers
nitrapyrin · yield · Zea mays (maize)Results differ
33 papers in the same direction as this paper · 9 in the opposite direction
- positive
- 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.