Abstract
A 3-yr study was conducted to determine the effects of inhibiting nitrification and addition of anhydrous ammonia on the fertilizer value of swine manure. Nitrapyrin (0.56, 1.12, 1.68 kg/ha), etradiazol (0.6, 1.2 kg/ha) and sodium methyl dithiocarbamate (1.2 kg/ha) were added to swine manure enriched with either 3.59 kg NH3/IOOO L for finishing, nursery and gestation house manure or 4.79 kg NH3/1000 L for farrowing house manure. All manures were injected in an Odell silt loam soil cropped to corn (Zea Mays L.) during fall or spring seasons at the rate of 28,062 to 30,868 L/ha for finishing, nursery and gestation house manure and 42,093 to 46,770 L/ha for farrowing house manure. Total nitrogen application rates on the manure plots ranged from 133 to 295 kg N/ha based on the corn plant requirement of 207 kg N/ha with a 7493 kg/ha grain yield. At above optimal nitrogen application levels, average corn yields were increased over 6% by addition of nitrification inhibitors. The beneficial effects of nitrification inhibitors on corn yields were greater when manure was applied in the fall compared to spring application. Over the entire study, adding 1.12 kg/ha of nitraprin or etradiazol to manure increased corn yields the most compared to other inhibitor levels or sodium methyl dithiocarbamate. Addition of 0.56 kg/ha of nitrapyrin in the fall also increased corn yields compared to manure applications without the inhibitor. Soil nutrient levels did not increase from the manure applications. Ammonia enrichment of the manure increased the proportion of the manure N in the NH4-N form. Lower stalk rot incidence and a trend towards increased N in grain and corn leaves were observed with the use of nitrification inhibitors.
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Claims 8
Claim · model-written summary
Nitrification inhibitors raised corn yield by over 6% at above optimal nitrogen rates.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- addition of nitrification inhibitorse0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Value
- over 6%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 over 6% by addition of nitrification inhibitors.”
Claim · model-written summary
Fall manure application produced greater inhibitor benefits to corn yield than spring application.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- manure was applied in the falle0
- Outcome
- beneficial effects of nitrification inhibitors on corn yieldse0
- Direction
- greatere0
- Comparator
- spring applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The beneficial effects of nitrification inhibitors on corn yields were greater when manure was applied in the fall compared to spring application.”
Claim · model-written summary
Adding 1.12 kg/ha nitraprin or etradiazol yielded the largest corn yield increase among inhibitor treatments.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 1.12 kg/ha of nitraprin or etradiazole0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Comparator
- other inhibitor levels or sodium methyl dithiocarbamatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“adding 1.12 kg/ha of nitraprin or etradiazol to manure increased corn yields the most compared to other inhibitor levels or sodium methyl dithiocarbamate”
Claim · model-written summary
Fall addition of 0.56 kg/ha nitrapyrin increased corn yields over manure alone.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 0.56 kg/ha of nitrapyrin in the falle0
- Outcome
- corn yieldse0
- Direction
- increasede0
- Comparator
- manure applications without the inhibitore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of 0.56 kg/ha of nitrapyrin in the fall also increased corn yields compared to manure applications without the inhibitor.”
Claim · model-written summary
Manure applications did not raise soil nutrient levels.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- manure applicationse0
- Outcome
- Soil nutrient levelse0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil nutrient levels did not increase from the manure applications.”
e1“corn (Zea Mays L.)”
Claim · model-written summary
Ammonia enrichment increased the NH4-N share of manure N.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- Ammonia enrichment of the manuree0
- Outcome
- proportion of the manure N in the NH4-N forme0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ammonia enrichment of the manure increased the proportion of the manure N in the NH4-N form.”
e1“corn (Zea Mays L.)”
Claim · model-written summary
Nitrification inhibitors reduced stalk rot incidence.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- use of nitrification inhibitorse0
- Outcome
- stalk rot incidencee0
- Direction
- Lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lower stalk rot incidence and a trend towards increased N in grain and corn leaves were observed with the use of nitrification inhibitors.”
Claim · model-written summary
Nitrification inhibitors showed a trend toward increased grain and leaf N.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- use of nitrification inhibitorse0
- Outcome
- N in grain and corn leavese0
- Direction
- increasede0
- Qualifier
- a trende0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a trend towards increased N in grain and corn leaves were observed with the use of nitrification inhibitors.”
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See all 1,164 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.