UTILIZATION OF EUCALYPTUS ASH AND LIMESTONE AS CORRECTIVES OF SOIL ACIDITY.

Aiming to evaluate the effects of eucalyptus ash and limestone on soil acidity correction at 0- 0.20 m depth, two experimental field trials were carried out between January and April 2013 at Campo Novo do Parecis (Mato Grosso state, Brazil). A randomized complete block design in a split-plot arrangement in time with four replications was used. In the experiment 1 treatments were days after the correctives application (0, 25, 50 and 75) and doses of eucalyptus wood ash (0, 4, 8 and 12 t ha-1). In the experiment 2 treatments were days after the correctives application (0, 25, 50 and 75) and limestone doses (0, 2, 4 and 6 t ha-1). Soil attributes were evaluated: pH (CaCl2), Al3+ exchangeable and potential acidity. A significant effect was observed between dose and time factors, as well in isolation, for correctives eucalyptus wood ash and limestone. Both the eucalyptus wood ash and limestone provide changes in the chemical properties of the soil, such as pH rise and reduction of Al3+ content and soil potential acidity. The eucalyptus ash doses, regardless of the evaluation periods, provided higher pH values than the limestone doses. [ABSTRACT FROM AUTHOR]