ATTRIBUTES OF ACIDITY AND EXCHANGEABLE CATIONS IN OXISOL FERTILIZED BY PHOSPHATE ALKALINE BIOSOLID
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Universidade Federal do Paraná
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Alkaline biosolid enriched by phosphorus (P) increase soil extractable P more than applied alone. It also can exert further effects above soil acidity attributes and exchangeable calcium and magnesium. These facts can contribute to the solution of problems with final destination, attracting farmers to use of adequate quantities of these biosolids by reducing his costs with P fertilization and liming operations. The objective of this work was to evaluate the acidity attributes pH (CaCl2 0.01 mol dm-3), exchangeable aluminum, potential acidity and exchangeable calcium and magnesium on an acidic Oxisol fertilized with alkaline biosolid phosphated with different levels of phosphorus from three sources after common bean grown under greenhouse condition. An alkaline biosolid was phosphate with 0% P, 0.436% P, 0.872% P and 1.745% P from partially acidulated rock phosphate Alvorada, single superphosphate and triple superphosphate. To stablish the treatments was recommended 45.85 kg P ha-1 of P from the levels of P added, except from 0% P. Four levels and 3 sources of P generated 12 treatments with 4 replications. Treatments were applied to 2.5 kg dry weight of Oxisol from Arapoti, PR, Brazil, in vases, which was cultivated with 6 common bean plants (cv. IPR Uirapuru). Under these experimental conditions phosphate alkaline biosolid applied in acidic Oxisol provided the largest increases of soil pH, exchangeable calcium and magnesium and decreases in exchangeable aluminum and potential acidity with the level of 0.436% P from the partially acidulated rock phosphate Alvorada and single superphosphate.
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