Oat fertilization in two planting systems

• Autor(a) principal: Primavesi, Ana Cândida
• Data de Publicação: 2002
• Outros Autores: Primavesi, Odo, Cantarella, Heitor, Godoy, Rodolfo, Vivaldi, Lúcio José
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Pesquisa Agropecuária Brasileira (Online)
• Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/6530
• topic: Avena sativa; conventional tillage; mulches; forage; yields; Avena sativa; cultivo convencional; matéria vegetal; forragem; rendimento

The objective of this work was to determine the best rates of N, P, and K to obtain maximum economic return per area of forage yield for the oat line UPF 87111 grown in two planting systems i.e conventional tillage and with a corn-residue mulch. The experiments were carried out in a Dark-Red Latosol (Hapludox). The experimental design was a incomplete (1/2)43 factorial, with two randomized blocks, with a total of 32 plots, without replication. The treatments comprised four rates of N and K2O (0, 70, 140, and 210 kg ha-1), using urea and potassium chloride, respectively, and four rates of P2O5 (0, 60, 120 and 180 kg ha-1), using triple superphosphate. The N, P, K rates for maximum profit were, in kg ha-1 for conventional tillage: N = 165, P2O5 = 50, K2O = 53; and for mulch-covered field: N = 210, P2O5 = 90, resulting in forage yields of, respectively, 6,641 and 7,322 kg ha-1 of dry matter. In both planting systems there was response only to N, and its use resulted in higher forage yield per unit of applied fertilizer.