Doses e modos de aplicação de fertilizante fosfatado na nutrição e produção de tapetes de grama esmeralda

Abstract

ABSTRACT: The experiment was conducted in a protected environment in the “Departamento de Recursos Naturais/Ciencia do Solo”, located in “Fazenda Experimental Lageado”, in the city of Botucatu-SP. The objective was to evaluate phosphorus doses and application methods in the nutrition and production of Zoysia, in LATOSSOLO VERMELHO Eutrofico with medium texture. The experimental design adopted was random blocks, with four replications, arranged in 2x4 factorial scheme, represented by two application methods of the phosphorous fertilizer (superficial application in total area, followed by 1 and 2 cm scarification and incorporated in furrow of 2,5 cm of depth spaced of 8 cm), and five P2O5 doses (0, 25, 50, 75 and 100 kg ha-1). The phosphorus fertilization was carried through 40 days after the cut, using as source simple superphosphate. N and K had been applied split in covering. It was evaluated P levels in the soil, soil cover rate by sod, green color 78 intensity and P levels in the leaves. The difference between the greater and minor dose of P2O5 related to the formation of the carpet was small. The P content in the soil existing before fertilization combined with P content from decomposition of roots was sufficient to maintain adequate content of P in the leaves showing no signs of deficiency. With 100 kg of P2O5 dose there was increment of 13% in the closing of the Zoysiagrass sod. In experimental conditions the P level of 16 mg dm-3 can provide the formation of Zoysiagrass sod, but in more time. The application method did not influence the formation rate of the Zoysiagrass sod or the P content in the leaves, the fertilizer can be applied in total area followed by surface chisel, a practice already used by producers.