Alteraciones químicas y fitodisponibilidad de níquel en suelo tratado con lodo albañal

Abstract

Recebido em 18/1/07; aceito em 26/10/07; publicado na web em 9/4/08 CHEMICAL ALTERATIONS AND NICKEL PHYTOAVAILABILITY IN SEWAGE SLUDGE-AMENDED SOIL. The alteration of soil chemicals and its influence on availability (DTPA extractant method) and phytoavailability (63 Ni L-value, isotopic method) of Ni was studied in sewage sludge-amended soil at different pHs. The soil pHs were 4.3, 5.3 and 5.9 and the rates of sewage sludge (SS) 0, 15, 30, 45 and 60 Mg ha-1. The chemical and physicochemical soil characteristics were altered by the SS rate and increased the Ni availability and phytoavailability. The isotopic method (63 Ni L-value) was more efficient in predicting the Ni phytoavailability that the Ni-DTPA extractant in soil pHs 5.3 and 5.9.