Chemical attributes of two soils under cassava wastewater application

Abstract

Cassava waste water is a rich in organic matter and nutrients, especially, potassium, nitrogen, phosphorus, magnesium, calcium and sodium, liquid residue; which, if discarded in an indiscriminate way may cause environmental degradation. In contrast, this residue presents huge potential for using as fertilizer. The aim of this study was to evaluate changes in chemical properties of two soils under increasing doses application of cassava wastewater. The experiment was carried out under greenhouse in a randomized design with five treatments (0, 27, 54, 108 and 216 m3 ha-1 of cassava wastewater) and three replicates. After 42 days of incubation, it was determined the following soil parameters: pH; CE of saturation extract of soil (CEes); and P, K+, Na+, Ca2+ and Mg2+ content. The incorporation of cassava wastewater increased pH, CEes and cation rates, mainly K+, in the soils. Soil texture and the increase in pH affected phosphorus adsorption.