Dinâmica da atividade da fosfatase ácida como indicador da disponibilidade de fósforo em diferentes texturas de solo na cultura da soja

Abstract

To achieve sustainable agricultural activity, phosphatase determination is an important practice for improving the efficiency of phosphorus (P) management in tropical agriculture. The objective of this study was to evaluate acid phosphatase activity in different soil textures and P stress levels affecting the nutritional, chemical, biochemical, and agronomic aspects of soybean. Treatments resulted from factorial combination in a 3x3 factorial scheme, consisting of three soil textures (clay, medium, and sandy) and three P stress levels (severe, moderate, and control) with four replications. Methods used were three different soil textures were used in the research: dystrophic Red Latosol (LVd) with clay texture, collected in the native forest; dystrophic Haplic Tb Cambisol (CXbd) of medium texture; and dystrophic Yellow Latosol (LAd) of sandy texture collected in the natural field. Soils were collected and sampled at a depth of 0–20 cm. Were agronomic determination, soil electrical conductivity, P content, P translocation, and acid phosphatase activity were also evaluated. Results showed the clayey textured soil provided the best results for plant growth, root, stem, and leaf dry matter content, P content, root volume and length, P translocation, and P content in the soil, and higher acid phosphatase activity under P stress. Concluded that acid phosphatase activity can be used to indicator P activity in different soil textures.