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

Autor(es)

EVANDRO L. SCHONINGER ^[1] ; HUGO A. GONZÁLEZ VILLALBA ^[2] ; JOSÉ ALBERTINO BENDASSOLLI ^[3] ; PAULO CESAR O. TRIVELIN ^[4]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 90, n. 4, p. 3299-3312, 2018-09-03.

Resumo

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)

• Processo FAPESP: 11/07176-1 - Absorção foliar de amônia e produtividade da cultura do milho em função da época de aplicação de uréia (15n) em cobertura
• Beneficiário: Evandro Luiz Schoninger
• Modalidade de apoio: Bolsas no Brasil - Doutorado