Abstract
A two-year study was conducted to determine the effects of inhibiting nitrification on the fertilizer value of swine manure applied in the summer season. Nitrapyrin (0.56, 1.12, 1.68 kg/ha; 0.5, 1.0, 1.5 lbs/ac) or etradiazol (1.2 kg/ha; 1.0 lb/ac) was added to swine manure from a finishing house. All manures were injected at the rate of 22 450 to 35 078 L/ha (2400 to 3750 gal/ac) into an Odell silt loam soil following wheat (Triticum aestivum) harvested in early July. Total nitrogen application rates on the manure plots ranged from 168 to 224 kg N/ha (150 to 200 lbs N/ac) based on the corn plant requirement of 207 kg N/ha (185 lb N/ac) with a 9415 kg/ha (150 bu/ac) grain yield. At above optimal nitrogen application levels, average corn yields were increased 5% by the addition of a nitrification inhibitor. The beneficial effects of nitrification inhibitors on corn yields were greater (13.5%) when manure was applied at the 168 kg N/ha (150 lb N/ac) rate as compared to the 224 kg N/ha (200 lb N/ac) rate. Response to the higher rate of nitrogen indicated excess N was applied than needed for grain production, which compensated partially for N loss. Over the entire study, adding 1.12 kg/ha (1.0 lb/ac) of nitrapyrin to manure increased corn yields the most compared to other inhibitor levels or etradiazol. Soil nutrient levels did not increase from the manure applications. There was a lower incidence of stalk rot when nitrification was inhibited.
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Claims 6
Claim · model-written summary
At above-optimal nitrogen levels, adding a nitrification inhibitor increased average corn yields by 5%.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- addition of a nitrification inhibitore0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Value
- 5%e0
- Qualifier
- At above optimal nitrogen application levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At above optimal nitrogen application levels, average corn yields were increased 5% by the addition of a nitrification inhibitor”
Claim · model-written summary
The yield benefit of nitrification inhibitors was greater (13.5%) with manure at 168 kg N/ha than at 224 kg N/ha.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- nitrification inhibitorse1
- Outcome
- corn yieldse1
- Direction
- greatere1
- Value
- 13.5%e1
- Qualifier
- manure was applied at the 168 kg N/ha (150 lb N/ac) ratee1
- Comparator
- 224 kg N/ha (200 lb N/ac) ratee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The beneficial effects of nitrification inhibitors on corn yields were greater (13.5%) when manure was applied at the 168 kg N/ha (150 lb N/ac) rate as compared to the 224 kg N/ha (200 lb N/ac) rate”
Claim · model-written summary
Over the whole study, adding 1.12 kg/ha of nitrapyrin to manure increased corn yields the most compared with other inhibitor levels or etradiazol.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- adding 1.12 kg/ha (1.0 lb/ac) of nitrapyrin to manuree2
- Outcome
- corn yieldse2
- Direction
- increasede2
- Comparator
- other inhibitor levels or etradiazole2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“adding 1.12 kg/ha (1.0 lb/ac) of nitrapyrin to manure increased corn yields the most compared to other inhibitor levels or etradiazol”
Claim · model-written summary
Soil nutrient levels did not increase from the manure applications.
- Taxon
- cornZea mays subsp. mayse5
- Treatment
- manure applicationse3
- Outcome
- Soil nutrient levelse3
- Direction
- did not increasee3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Soil nutrient levels did not increase from the manure applications”
e5“corn plant”
Claim · model-written summary
There was a lower incidence of stalk rot in corn when nitrification was inhibited.
- Taxon
- cornZea mays subsp. mayse5
- Treatment
- nitrification was inhibitede4
- Outcome
- incidence of stalk rote4
- Direction
- lowere4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“There was a lower incidence of stalk rot when nitrification was inhibited”
e5“corn plant”
Claim · model-written summary
The response to the higher nitrogen rate indicated that more N was applied than needed for grain production, partially compensating for N loss.
- Taxon
- cornZea mays subsp. mayse5
- Treatment
- higher rate of nitrogene6
- Outcome
- excess N was applied than needed for grain productione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Response to the higher rate of nitrogen indicated excess N was applied than needed for grain production, which compensated partially for N loss”
e5“corn plant”
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