Abstract
Abstract The yield response to N with and without the use of the nitrification inhibitor, dicyandiamide (DCD), was determined on the field crops, sweet corn, cotton, wheat, and grain sorghum; and on the vegetable crops, bell peppers, potato, and tomato, on a large number of different soils in Alabama, Florida, Kentucky, Mississippi, and Virginia. In general, DCD inhibited nitrification for several weeks but inhibiting nitrate formation was not often reflected in crop yield response to N. Increase in yield resulting from DCD use were found for sweet corn in Florida, grain sorghum in Alabama, and potato in one of two years in Florida. Results with cotton were erratic, sometimes resulting in increased, sometimes in decreased, yields. Use of DCD for wheat production in the Southeast did not prove to be advantageous. Generally when DCD use benefitted yields, this occurred at the lower N rates, indicating that preventing loss of N at the lower end of the response curve resulted in a measurable positive effect. The studies reported indicate that consistent benefit from DCD use in the southeastern United States is unlikely.
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Claims 10
Claim · model-written summary
DCD inhibited nitrification in the crops for several weeks.
Not reportedComparator
Verbatim
e1“DCD inhibited nitrification for several weeks but inhibiting nitrate formation was not often reflected in crop yield response to N”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
Inhibiting nitrate formation with DCD was generally not reflected in the crop yield response to nitrogen.
Not reportedComparator
Verbatim
e1“DCD inhibited nitrification for several weeks but inhibiting nitrate formation was not often reflected in crop yield response to N”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
DCD use increased sweet corn yield in Florida.
Not reportedComparator
Verbatim
e2“Increase in yield resulting from DCD use were found for sweet corn in Florida, grain sorghum in Alabama, and potato in one of two years in Florida”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
DCD use increased grain sorghum yield in Alabama.
- Taxon
- grain sorghum
Sorghum bicolore2 - Treatment
- DCD usee2
- Outcome
- yielde2
- Direction
- Increasee2
- Setting
- Alabamae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Increase in yield resulting from DCD use were found for sweet corn in Florida, grain sorghum in Alabama, and potato in one of two years in Florida”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
DCD use increased potato yield in Florida in one of two years.
- Taxon
- potato
Solanum tuberosume2 - Treatment
- DCD usee2
- Outcome
- yielde2
- Direction
- Increasee2
- Qualifier
- in one of two yearse2
- Setting
- Floridae2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Increase in yield resulting from DCD use were found for sweet corn in Florida, grain sorghum in Alabama, and potato in one of two years in Florida”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
DCD effects on cotton yield were erratic, sometimes increasing and sometimes decreasing it.
- Taxon
- cotton
Gossypium hirsutume3 - Treatment
- DCDe1
- Outcome
- yieldse3
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Results with cotton were erratic, sometimes resulting in increased, sometimes in decreased, yields”
e1“DCD inhibited nitrification for several weeks but inhibiting nitrate formation was not often reflected in crop yield response to N”
Claim · model-written summary
DCD use for wheat production in the Southeast did not prove advantageous.
- Taxon
- wheat
Triticum aestivume4 - Treatment
- DCDe4
- Outcome
- wheat productione4
- Direction
- did not prove to be advantageouse4
- Setting
- in the Southeaste4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Use of DCD for wheat production in the Southeast did not prove to be advantageous”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
DCD benefitted yields mainly at lower N rates in field crops.
Verbatim
e5“Generally when DCD use benefitted yields, this occurred at the lower N rates, indicating that preventing loss of N at the lower end of the response curve resulted in a measurable positive effect”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
Preventing N loss at the lower end of the response curve gave a measurable positive effect on crop yield.
Verbatim
e5“Generally when DCD use benefitted yields, this occurred at the lower N rates, indicating that preventing loss of N at the lower end of the response curve resulted in a measurable positive effect”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
Claim · model-written summary
Consistent yield benefit from DCD use in the southeastern United States is unlikely.
Verbatim
e6“consistent benefit from DCD use in the southeastern United States is unlikely”
e0“determined on the field crops, sweet corn, cotton, wheat, and grain sorghum”
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See all 19 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.