Reactivity of two acidity correctives in a medium texture soil

For crops to have good productivity, it is necessary adopt agricultural practices that ensure an adequate supply of water and nutrients, neutralize toxic elements in the soil, especially exchangeable aluminum, both arable layer subsurface. One these usually employed small medium large rural properties correction soil acidity, which aims, addition neutralizing provide calcium magnesium for plants. Several materials been used correct with carbonates, oxides, hydroxides or silicates as components. In present work, reactivity two acidity correctives was evaluated a texture, high aluminum saturation: 72.96%. The were steel slag (calcium silicate), dolomitic limestone, applied doses equivalent one, one half, two, half times analytically predicted amount, raise base saturation 60%, using acetate H+ + Al3+ extractor. study also included control treatment, did not receive correction. method evaluate incubation. block design used, six repetitions per concealer dose. experimental units plastic bags 3.0 kg soil. After mixing corresponding each they transferred incubated at 70% maximum retention capacity ninety days. incubation period, analyzed pH CaCl2, H2O, (Al+3), (V %). Steel limestone had same efficiency increase saturation. CaCl2 H2O highly correlated, average being 0.50 greater than CaCl2. equation relate Y= 1.0273 x 0.4716, R2 = 0.9730. Complete neutralization Al+3 occurred when raised 5.03 (pH CaCl2) 5.50 H2O). extraction resulted underestimation cation exchange 7.0 (CTC T), consequently corrective dose be applied. On average, there need double amount reach desired doses, CaCO3 equivalents, 9.1476x 3.8439, 0.9449.