Abstract
Nitrogen is one of the most important and costly nutrient inputs for crop production. Farmers are looking for better management practice to enhance production and reduce environmental impact. A 3‐yr field study was established to examine corn ( Zea mays L.) grain yield and nutrient uptake resulting from application of 168 kg N ha −1 as urea (U), urea‐ammonium nitrate (UAN), ammonium nitrate (NH 4 NO 3 ), poultry litter (PL), and similar rate of commercially available enhanced‐efficiency nitrogen fertilizers (EENF) as follow: polymer‐coated urea (ESN), SuperU, UAN + AgrotainPlus, and PL + AgrotainPlus in a no‐till corn production. Treatments were replicated four times in a completely randomized block design from 2009 to 2011. Aboveground plant biomass was harvested at physiological maturity each year to determine dry matter and nutrient uptake. Soil samples were taken three times per year to evaluate the status of the selected nutrients in soil. There was a significant increase in corn aboveground dry matter and grain yield with application of 168 kg N ha −1 compared with control treatment. There was no significant difference in corn grain yield or dry matter among the N sources. However, averaged across all N sources, corn grain yield (10.1 Mg ha −1 ) in 2009 was greater than grain yield (7.5 Mg ha −1 ) in 2010 and 2011, mainly due to higher rainfall and better distribution in 2009. Addition of AgrotainPlus to UAN and PL did not influence corn grain yield. Additional research is needed to evaluate EENFs under different climatic conditions and different management practices.
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Claims 7
Claim · model-written summary
Nitrogen application increased corn aboveground dry matter relative to control.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- application of 168 kg N ha −1e0
- Outcome
- corn aboveground dry mattere0
- Direction
- increasee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant increase in corn aboveground dry matter and grain yield with application of 168 kg N ha −1 compared with control treatment.”
Claim · model-written summary
Nitrogen application increased corn grain yield relative to control.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- application of 168 kg N ha −1e0
- Outcome
- grain yielde0
- Direction
- increasee0
- Comparator
- control treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was a significant increase in corn aboveground dry matter and grain yield with application of 168 kg N ha −1 compared with control treatment.”
Claim · model-written summary
Corn grain yield did not differ significantly among nitrogen sources.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn grain yielde0
- Direction
- no significant differencee0
- Comparator
- N sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant difference in corn grain yield or dry matter among the N sources.”
Claim · model-written summary
Corn dry matter did not differ significantly among nitrogen sources.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- dry mattere0
- Direction
- no significant differencee0
- Comparator
- N sourcese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant difference in corn grain yield or dry matter among the N sources.”
Claim · model-written summary
Across nitrogen sources, corn grain yield was higher in 2009 than in 2010 and 2011.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- corn grain yielde0
- Direction
- greater thane0
- Value
- 10.1 Mg ha −1e0
- Qualifier
- 7.5 Mg ha −1e0
- Comparator
- 2010 and 2011e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“averaged across all N sources, corn grain yield (10.1 Mg ha −1 ) in 2009 was greater than grain yield (7.5 Mg ha −1 ) in 2010 and 2011”
Claim · model-written summary
Adding AgrotainPlus to UAN did not influence corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Addition of AgrotainPlus to UANe0
- Outcome
- corn grain yielde0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of AgrotainPlus to UAN and PL did not influence corn grain yield.”
Claim · model-written summary
Adding AgrotainPlus to poultry litter did not influence corn grain yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- AgrotainPlus to UAN and PLe0
- Outcome
- corn grain yielde0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of AgrotainPlus to UAN and PL did not influence corn grain yield.”
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