Abstract
Abstract Urea splitting and the use of stabilized ureas in corn ( Zea mays L.) crops are management strategies that increase urea efficiency and reduce nitrogen (N) losses by volatilization and leaching. This study aimed to evaluate the effects of urea stabilized with urease inhibitor (UI) and nitrification inhibitor (NI) compared to conventional urea applied at three different schedules, on corn grain yield and the dynamics of inorganic nitrogen on an Amazonian Cerrado soil, Brazil. Two experiments were carried out, one in 2019 and the other one in 2021, in a randomized block design with four replications. Treatments were arranged in a factorial scheme (3 × 3), with three types of urea (urea, U; UI; and NI) and three application schedules (100% at planting, 30% at planting and 70% as topdressing, and 30% at planting and two topdressings with 35% N). In 2019, compared to U and UI, NI increased corn yield when 100% of urea was applied at planting. Regardless of the splitting management, NI ensured the same yields. In 2021, urea splitting was required to improve corn yields, and UI promoted higher yield in all urea application schedule. In 2019 and 2021, both NI and UI, respectively, ensured higher inorganic N levels in the soil, especially after the first topdressing. These N contents are reflected in yield gains. Urea with nitrification or urease inhibitor may be a relevant option for managing nitrogen fertilization in corn crops in the Amazonian Cerrado.
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Claims 7
Claim · model-written summary
In 2019, NI increased corn yield relative to U and UI when all urea was applied at planting.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- NIe0
- Outcome
- corn yielde0
- Direction
- increasede0
- Qualifier
- 100% of urea was applied at plantinge0
- Comparator
- U and UIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2019, compared to U and UI, NI increased corn yield when 100% of urea was applied at planting.”
Claim · model-written summary
NI produced the same yields across splitting schedules in 2019.
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Regardless of the splitting management, NI ensured the same yields.”
t0“maize”
Claim · model-written summary
Urea splitting improved corn yields in 2021.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- urea splittinge0
- Outcome
- corn yieldse0
- Direction
- improvee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2021, urea splitting was required to improve corn yields”
Claim · model-written summary
UI promoted higher yield at every urea application schedule in 2021.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UI promoted higher yield in all urea application schedule.”
t0“maize”
Claim · model-written summary
NI maintained higher soil inorganic N levels in 2019, especially after the first topdressing.
- Treatment
- NIe0
- Outcome
- inorganic N levels in the soile0
- Direction
- highere0
- Qualifier
- after the first topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2019 and 2021, both NI and UI, respectively, ensured higher inorganic N levels in the soil, especially after the first topdressing.”
t0“maize”
Claim · model-written summary
UI maintained higher soil inorganic N levels in 2021, especially after the first topdressing.
- Treatment
- UIe0
- Outcome
- inorganic N levels in the soile0
- Direction
- highere0
- Qualifier
- after the first topdressinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 2019 and 2021, both NI and UI, respectively, ensured higher inorganic N levels in the soil, especially after the first topdressing.”
t0“maize”
Claim · model-written summary
The authors propose inhibitor-stabilized urea for nitrogen fertilization of corn in the Amazonian Cerrado.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Urea with nitrification or urease inhibitore0
- Setting
- Amazonian Cerradoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Urea with nitrification or urease inhibitor may be a relevant option for managing nitrogen fertilization in corn crops in the Amazonian Cerrado.”
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