NICKEL IN THE HUMIC SUBSTANCES OF A SOIL AFTER APPLICATION OF SEWAGE SLUDGE CONTAMINATED WITH INCREASING RATES OF THE METAL AND CULTIVATION WITH SORGHUM

摘要

For the economical and ecological management of sewage sludge detailed studies are required in order to monitory areas that receive the waste,so the risks to plants and man are evaluated(Sims,1996).Only a fraction of the nickel added to the soil is available to plants so that the knowledge of its distribution in soils is important to the management of residues containing the heavy metal.The objective of this work was to evaluate the distribution of nickel in the different fractions of the soil organic matter when sewage sludge enriched with increasing rates at the heavy metal was applied to a latosol that was then cropped with sorghum.