Effect of land isposal of stillage on the leaching of soil nutrients. II. Phosphate.

Abstract

A typic soil of the sugarcane region of Campos, RJ, (Typic Paleudult) was incubated with increasing volumes of stillage (equivalents to 0, 50, 100, 150, 200 and 400 m³/ha) with and without additon of N and P and was leached, in leaching columns, with volumes of water equivalent to 1, 2 and 3 volumes of soil pores. For the treatments without NP, the phosphate contents of the effluents did not show any practical difference for the three leaching volumes. For the treatments with NP, the phosphate contents of the effluents, for each leaching volume, tended to decrease as the applied volumes of stillage increased. Phosphate leaching practically ceased al the dose of stillage equivalent to 400 m³/ha.