CHEMICAL PROPERTIES OF THE SOIL CULTIVATED WITH CASTOR OIL PLANT, IRRIGATED WITH TREATED WASTEWATER AND FERTILIZED WITH BIOSOLID

Abstract

The objective of this work was to evaluate the chemical properties of the soil cultivated with castor oil plant, irrigated with wastewater and fertilized with biosolid. The experiment consisted of 21 treatments, in which were evaluated three biosolid levels (0, 75 and 150 kg ha-1 of N), 2 types of water (water of provisioning and treated wastewater), and a control with chemical conventional manuring, with three replications. The contents of total phosphorus, potassium, sodium, calcium, magnesium, hydrogen and aluminum (exchangeable), carbon, organic matter and total nitrogen were evaluated, besides the micronutrients boron, copper, iron, manganese and zinc. The soil of the treatments irrigated with treated wastewater presented a good increment of organic matter, nitrogen and phosphorus, essential nutrients to the growth and development of the plant. The biosolid presented significant effect, just for the variable iron.