Metais pesados em argissolo acinzentado após a utilização de rejeito de mineração como fertilizante para culturas anuais

Abstract

The use of mining waste as an alternative source of nutrients assumes significant importance today, due to their potential to reduce production costs and minimize environmental impacts. Thus, this study aimed to evaluate the accumulation and availability of Cd, Pb, Cr and Ni in an Ultisol under the addition of mining waste as an alternative fertilizer for crops. The experiment was conducted in a greenhouse, in desing was the causalized blocks with four replications, in a factorial outline (4 x 3), with four sources (0, 60, 120 and 240 mg kg-1 of K2O) and three sources (RM without application of additional fertilizer, RM with application of additional fertilizers and KCl as reference). The results showed that application from the mine did not promote accumulation of the available concentration of Cd and Pb in soil along the cycles of soybeans, millet and watermelon, however caused increased levels of available Cr and Ni in soil during the three crops succession. For that, The use of mine tailing associated with additional fertilization is recommended as an alternative source of K for annual crops and reducing costs with commercial fertilizers