Ciclagem de fósforo por plantas de cobertura

Abstract

The objective of this work was to study the capacity of phytomass production, cycling and phosphorus release by cover crop species in the northern region of Mato Grosso. The treatments consisted of five species of cover plants: Crotalaria spectabilis; Mucuna; Urochloa brizantha cv. piatã; Eleusine coracana and nine evaluation periods: 0, 15, 30, 45, 60, 90, 120, 150 e 180 days after desiccation of the cover plants. In which the decomposition kinetics of straw were evaluated, soil cover rate, remaining phosphorus in the straw and cumulative release of phosphorus in the corn crop implanted in succession and its productivity. The species U. brizantha and P. glaucum showed the highest accumulations of dry matter mass, the highest amounts of phosphorus accumulated in the dry matter mass, as well as the highest amounts of accumulated phosphorus release estimated at 80 days after desiccation. The specie U. brizantha yielded the highest productivity of the maize crop.