Degraded Soil Recovered by Biosolid Application.

The objective of this study was to evaluate the efficiency of biossolid application on the recovery of a sandy soil which had been degraded by the loss of the superficial layer and high compaction level. The experiment was conducted at Entre Rios Farm from Suzano Bahia Sul Company, in Itatinga, São Paulo State, Brazil. The treatments were: doses of sewage sludge on a dry basis (2.5, 5, 10, 15 and 20 Mg ha^-1 + K supplementation), conventional fertilization (NPK) and control. Biosolid caused an increase in soil quality in recovery regarding the significant increase of its main chemical characteristics, such as phosphorus, calcium, organic matter and CEC. The continued residue application characterizes a recovery measure for degraded areas as a whole.