The variation in the Ca:Mg ratio in amendments used to neutralize soil acidity is way of altering the availability of those nutrients in forage species and properties soil chemists. The objective of work was to evaluate the effect of different proportions of calcium and magnesium in of CaCO3 and MgCO3 on agronomy characteristics on soil chemist properties in forage species in Araguaína city, Tocantins state. The study was carried on Entisol, with factorial 3 x 5 and four replications. The treatments had consisted of ratio application equivalent the 4t/ha of calcareous, using mixtures of CaCO3 and MgCO3 in diverse ratios until reaching relations Ca:Mg of 1:1; 2:1; 4:1, 6:1 and 8:1, applied in Entisol, with 5% of clay, cultivated with three forages species (Brachiaria brizantha cv. Xaraés, Panicum maximum cv: Mombaça e Stylosanthes Campo Grande - Stylosanthes capitata e S. macrocephala). The different relations Ca:Mg was however influenced in development and productivity of forages, however was not coherent behavior that indicated the trend of reply of the plants to the increase or reduction of the relation Ca:Mg. Moreover, the different forages were been similar in relation the soil chemistry, however the relations Ca:Mg had modified the chemical soil properties.
grass; legume; liming; nutrients; soil fertility