Abstract
The basis for feeding flocks Brazilian is on the grasses, which currently occupy approximately 180 million hectares, of which 56% belong mainly to the genus Brachiaria. Much of the national herd is in the region of savannas, where all soils, the Oxisols, have high acidity, high aluminum saturation (Al) in the exchange complex, have low cation exchange capacity, low levels of P, Ca and Mg.…