Phosphorus availability for soybean cultivated in soil treated with urban and industrial waste under no-tillage system

• Grant number: 11/12189-5
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): November 01, 2011
• Effective date (End): October 31, 2012
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal researcher: Leonardo Theodoro Bull
• Grantee: João Arthur Antonangelo
• Home Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

The rational use of industrial and urban wastes in agriculture under no till system promotes many benefits on physical, chemical and biological soil properties, thus reducing the use of synthetic fertilizers, providing beneficial effects to soil and ecosystem. And act as attenuators of soil acidity, these residues are excellent sources of nutrients such as phosphorus. The characterization of various forms and availability of P fractions in addition to evaluating not monitored regularly by the methods of diagnosis of soil fertility, can help to understand the cycle of this nutrient in the soil. The study aims to evaluate the forms for a year and availability of P in soil cultivated with soybean and fertilized with industrial and urban wastes under no till system for nine years. Does the experimental design used randomized blocks with four replications. The treatments consist of four residues, two municipal waste (sludge digester and centrifuged) and two industrial waste (steel slag and lime mud), and a control with lime at the recommended dose (on witness), the doses of these residues correspond to 0, ½, 1 and 2 times the need for lime to achieve the ideal pH, equivalent to 0, 2, 4 and 8 t ha-1. The forms and availability of P in the soil will be characterized by sequential fractionation, following the methodology proposed by Hedley and Chang and Jackson.For this purpose, soil samples will be collected on the plots at depths of 0-5, 5-10, 10-20 and 20-40 before the deployment of culture, and the flowering period will be collected plant material for nutritional diagnosis in the plant, as well as in grain at the time of production. (AU)