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

Autor(es)

Schoninger, Evandro L. ^[1] ; Gonzalez Villalba, Hugo A. ^[2] ; Bendassolli, Jose Albertino ^[3] ; Trivelin, Paulo Cesar O. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estado Mato Grosso UNEMAT, Dept Agron, Campus Univ Nova Mutum, Ave Arapongas, 1384-N, BR-78450000 Nova Mutum, MT - Brazil

^[2] Univ Estado Sao Paulo USP, ESALQ, Dept Ciencia Solo, Ave Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

^[3] Univ Sao Paulo, CENA, Lab Isotopos Estaveis, Ave Centenario 303, BR-13416903 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 90, n. 4, p. 3299-3312, OCT-DEC 2018.
• Citações Web of Science: 0

Resumo

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