Recuperação de áreas degradadas - efeito de ácido no crescimento inicial das plantas.

Abstract

The objective in that work is to verify the effect of correctives in the attributesof the soil and in the initial growth of the castor oil plant and of thesunflower cultivated in soils degraded by salts. The soil was collected in theirrigated perimeter of São Gonçalo that after the gessagem and wash wasanalyzed. Soon after sulfuric acid, incubation was applied and again samplingfor analyses. The tolerance was evaluated to the salinity of 02 species: Sunflower (Helianthus annus L.) mamoneira (Ricinus communis L.), cultivated insaline soil with six different doses of concentrated sulfuric acid (0,0 - 1,0 -2,0 - 3,0 - 4,0 - 5,0 mL kg-1). According to the results the plaster reducedthe pH, CE and Na+ of the soil and it increased the tenors of Ca2+. Withrelationship to the sulfuric acid reduced significantly of the pH. Relative theheight, diameter of the I collect, number of leaves and production of dry massof the castor oil plant and sunflower, the sulfuric acid didn't present significant increase.