Fracionamento de fósforo em solo do cerrado sob diferentes manejos

• Ano de defesa: 2023
• Autor(a) principal: FRANCISCO MENDES DE OLIVEIRA NETO
• Orientador(a): Rafael Felippe Ratke
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Fundação Universidade Federal de Mato Grosso do Sul
• País: Brasil
• Palavras-chave em Português: Urochloa ssp., Glycine Max, Gossypium hirsitum L., Plantas de Cobertura pastejo.
• Link de acesso: https://repositorio.ufms.br/handle/123456789/5738

To increase the efficiency of the use of cover crops in the Brazilian Cerrado environment, it is necessary that these cultures can promote an adequate cycling of phosphorus in the system. The objective of this work was to evaluate the effect of different managements with vegetation cover, on the phosphorus fractions present in a sandy soil area, correlating them 9 with the factors that integrated each management. The experimental design consists of 6 treatments, with 3 randomized blocks. The treatments are: T1 – Soybean in the off-season with fallow and weed management in the off-season; T2 – Soybean in the harvest with fallow in the off-season; T3 – Soybean in season and off season of Urochloa cv. Piatã cultivated single for 8 months; T4 - Soybean in the harvest and off-season of U. Piatã, niger, forage turnip, cowpea and buckwheat for 8 months; T5 - Soybean in the harvest and off-season of U. Piatã, niger, fodder turnip, cowpea and buckwheat for 20 months; T6 - Soybean in the harvest and off-season of U. Piatã, niger, fodder turnip, cowpea and buckwheat with entry of animals. The variables obtained by the fractionation of soil samples were: sorbed phosphorus (PSO), total phosphorus (PTO), soluble phosphorus (PSOL), oxidizable phosphorus (POX), organic phosphorus (POR), phosphorus in calcium (PCA) and occluded phosphorus (POC). From the data obtained, an analysis of canonical variables and network of correlations was carried out. According to the results obtained, the systems that presented the highest content of soluble phosphorus were the systems containing cover in the off-season of U. Piatã, niger, forage radish, cowpea and buckwheat for 20 months and with the entry of animals for grazing. The greater permanence of vegetation cover provides the system with a higher soluble phosphorus content for the subsequent crop. The highest levels of sorbed P are correlated to the soybean-cotton rotation system with fallow in the off-season, in Quartzarenic Neosol.