Adubação do milho com superfosfato triplo em Latossolo Vermelho sob efeito residual de fontes alternativas de fósforo

Abstract

In variable-charge soils, the use of alternative phosphorus sources may influence further soluble phosphate fertilization. This study aimed to evaluate phosphorus (P) availability for corn plants in response to triple superphosphate fertilization (TSP) in a Typic Hapludox (Oxisol) soil with residual P from alternative sources. The experiment was carried out in a greenhouse under a completely randomized design and 2x4x5 factorial scheme, with four replications. Treatments consisted of five TSP doses (0, 30, 60, 90, and 120 mg dm -3 P), and two sequential corn croppings with and without liming; the area was previously grown with Urochloa spp. and fertilized with precipitated phosphate-1 (PP1), precipitated phosphate-2 (PP2), natural reactive phosphate (NRP), and TSP at 120 mg dm -3 . The P from TSP has its dynamics within the soil-plant system and fertilization efficiency in corn crops altered by the residual effect of P from alternative sources and by soil acidity correctives. The residual effects of PP2 and NRP, dry matter yield and P accumulation in corn were higher for TSP doses above 30 mg dm -3 , being greater in the first cropping and in limed soils. Yet for PP2 and NRP residual effects, the highest soil availability of P was registered after the two sequential cropping in both acidity conditions, thus showing an enhanced residual effect.

Uso De Biomaphos No Tratamento De Sementes De Hibridos De Milho Cultivado Na Safrinha

“…Dentre os nutrientes essenciais o fósforo é o elemento que limita mais frequentemente a produção das culturas na região dos cerrados, sua deficiência pode causar atraso no crescimento e interferir nos processos de fotossíntese, respiração, armazenamento e transferência de energia, divisão celular e crescimento das células vegetais (HAMMOND et al, 2008). Portanto devido a essas condições são necessárias aplicações de altas doses de fósforo, visando uma adequada nutrição do milho e consequentemente obtenção de maiores produtividades (CRUZ, 2015).…”