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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

N-15-Fertilizer Recovery in Maize as an Additional Strategy for Understanding Nitrogen Fertilization Management with Blends of Controlled-Release and Conventional Urea

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Garcia, Pedro Lopes [1] ; Sermarini, Renata Alcarde [2] ; Ana Filho, Carlos Roberto de Sant [3] ; Bendassolli, Jose Albertino [1] ; Boschiero, Beatriz Nastaro [1] ; Trivelin, Paulo Cesar Ocheuze [1]
Total Authors: 6
[1] Univ Sao Paulo, Ctr Nucl Energy Agr CENA, Stable Isotopes Lab, BR-13416000 Piracicaba, SP - Brazil
[2] Univ Sao Paulo, Luiz de Queiroz Coll Agr ESALQ, Exact Sci Dept, BR-13418900 Piracicaba, SP - Brazil
[3] Compass Minerals Plant Nutr, Innovat Ctr, BR-13495000 Iracemapolis, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: AGRONOMY-BASEL; v. 10, n. 12 DEC 2020.
Web of Science Citations: 0

A single application of polymer-sulfur coated urea (PSCU) and conventional urea (U) is expected to ensure nitrogen (N) throughout the maize (Zea mays L.) growth cycle being U the likely main N-fertilizer supplier at the beginning and PSCU during the maize growth cycle. This research aimed to evaluate N fertilization management (split, incorporated, and broadcast application) and fertilizer blends (30%PSCU + 70%U and 70%PSCU + 30%U) on volatilization of ammonia (AV) and soil N mineral content (NM); plant N uptake (NU) and N-15-fertilizer recovery (NR); and yield (GY). Field experiments were conducted for two growing seasons (2017-2018 and 2019-2020) in Rhodic Eutrustox soil. U was treated with NBPT (N-(n-butyl) thiophosphoric triamide). N rate was 180 kg ha(-1). AV reached 12% of the applied N (broadcast-applied 70%PSCU + 30%U, 2017-2018). The 30%PSCU + 70%U application resulted in higher NM at 40-60 cm depth in vegetative and reproductive stages in both seasons. The 70%PSCU + 30%U application resulted in the highest GY in 2017-2018, and the N treatments did not affect GY in 2019-2020. NR was 3% on average at vegetative leaf stage 4 (V4), and PSCU, the main N-fertilizer supplier applying 70%PSCU + 30%U. After V4, the main N-fertilizer supplier is PSCU for 70%PSCU + 30%U and U for 30%PSCU + 70%U application. These blends (incorporated, broadcast, and split application) can ensure N during the maize growth cycle, with NR of 72.5% at maturity (R6) being 47.9% in the grain. (AU)

FAPESP's process: 17/25813-5 - Nitrogen (15N) use efficiency for fertilization managements of maize and common bean using mixtures of polymer sulfur coated urea and conventional urea
Grantee:Pedro Lopes Garcia
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/24516-7 - Special nitrogen fertilization managements in sugarcane, corn and common bean crops aiming to increase N use efficiency (NUE) and agricultural yield
Grantee:Paulo Cesar Ocheuze Trivelin
Support Opportunities: Regular Research Grants