Application strategies and nitrogen rates for maize grown in clay soil

• Autor(a) principal: Silva Bernardes, João Victor
• Data de Publicação: 2020
• Outros Autores: Orioli Júnior, Valdeci
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Revista de Ciências Agrárias (Belém. Online)
• Texto Completo: https://ajaes.ufra.edu.br/index.php/ajaes/article/view/3304
• topic: Zea mays; Nitrogen fertilization; Pre-sowing fertilization; Nitrogen fertilization; Zea mays; Adubação nitrogenada; Antecipação da adubação; Adubação nitrogenada

Nitrogen utilization by maize is dependent on the rate and time at the nutrient is supplied. The objective of this study was to evaluate the maize morphological and productive aspects in a clayey Oxisol. The experiment was carried out under field conditions in the Iraí de Minas - MG in irrigated area. A randomized complete block design was used in a 5 x 2 + 1 factorial scheme, with four replications. The treatments consisted of five N rates (0, 50, 100, 150 and 200 kg ha-1) associated with two application times (pre-sowing and sidedressing) and an additional treatment referring to the fertilization adopted by the farm. The pre-sowing application was performed 15 days before sowing and the sidedressing when the plants had 4 - 5 fully expanded leaves. The farm fertilization consists of the 35 kg ha-1 of N, 139 kg ha-1 of P2O5 and 70 kg ha-1 of K2O at sowing and two applications of 50 kg ha-1 of N in sidedressing, the first was performed 17 days after the plants emergence and the second 10 days after the first application. Urea was used as the source of N. It was concluded that the N application in pre-sowing was efficient under the edaphoclimatic conditions considered. The N rate of 200 kg ha-1 provided the highest crop yield.