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

Corn grain yield and 15N-fertilizer recovery as a function of urea sidedress timing

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Author(s):
EVANDRO L. SCHONINGER [1] ; HUGO A. GONZÁLEZ VILLALBA [2] ; JOSÉ ALBERTINO BENDASSOLLI [3] ; PAULO CESAR O. TRIVELIN [4]
Total Authors: 4
Affiliation:
[1] Universidade do Estado de Mato Grosso. Departamento de Agronomia - Brasil
[2] Universidade do Estado de São Paulo. Escola Superior de Agricultura “Luiz de Queiroz” - Brasil
[3] Universidade de São Paulo. Centro de Energia Nuclear na Agricultura. Laboratório de Isótopos Estáveis - Brasil
[4] Universidade de São Paulo. Centro de Energia Nuclear na Agricultura. Laboratório de Isótopos Estáveis - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Anais da Academia Brasileira de Ciências; v. 90, n. 4, p. 3299-3312, 2018-09-03.
Abstract

Abstract Best fertilizer management practices such as adopting the right N sidedress timing can reduce N losses by volatilization, thus, raising N-fertilizer recovery and grain yield. To evaluate ammonia (N-NH3 ) losses, N-fertilizer recovery and grain yield as a function of urea sidedress timing in corn, a field study was conducted during the 2011-2012 and 2012-2013 growing seasons, adopting a complete randomized block design with four replications. Treatments consisted of urea sidedress timing (140 kg N ha-1) at V4, V6, V8, V10, and V12 growth stages, plus a control without sidedress N. The largest N losses by N-NH3 volatilization occurred when urea was applied at V10 or V12 growth stages, reaching losses of 35 and 41 % of the total applied N. Although climatic factors influences N-NH3 volatilization process, crop characteristics such as canopy development also seems to affect N-NH3 losses. Nitrogen application at V4 or V6 growth stages resulted in greater N-fertilizer recovery from urea sidedress, reaching values of 53 %. No increase in corn grain yield was observed with N application at different corn growth stages during the two growing seasons evaluated, most likely due to high N mineralization rates from the soil. (AU)

FAPESP's process: 11/07176-1 - LEAF ABSORPTION OF AMMONIA AND CORN YIELD INFLUENCED BY TOP-DRESSED FERTILIZATON SEASON WITH 15N-UREA
Grantee:Evandro Luiz Schoninger
Support Opportunities: Scholarships in Brazil - Doctorate