Aridouglas dos Santos Araújo

Relação Ca: Mg do corretivo da acidez do solo e as características agronômicas de plantas forrageiras

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 Araguaina 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. Xaraes, Panicum maximum cv: Mombaca e estilosante 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.

Chemical Characteristics of the Use of Gelatine Sludge in Soil Cultivated as Fertilizer

Various types of industrial wastes have been tested as a source of pasture fertilization. However, little is known about the sludge of the gelatine industry. This study aimed at testing gelatine sludge as a soil amendment by assessing the chemical modifications caused in the soil profile. The experiment was conducted in Araguaina, Tocantins, using a typical Quartzipsamment soil (Entisols) from February to November 2013. Four doses were tested in experimental plots: 0, 50, 150 and 300 m3 ha-1. Soil sampling was performed at four depths: 0-5, 5-10, 10-20 and 20-30 cm with collection at the beginning and the end of the experimental period. Five grazing simulations of 21 days of rest of Piata grass were testes. The gelatine sludge was able to raise the contents of calcium, phosphorus, and sum of bases only in the superficial layer (0-5 cm) and did not alter the pH, potential acidity and saturation by base, indicating that there was no use restriction due to salinization or acidification. Therefore, it was concluded that the maximum tested dose (300 m3 ha-1) improved the chemical characteristics of the soil, especially in the 0-5-cm layer.