SUPERFICIAL APPLICATION OF LEVIESTONE AND FERTILIZATION ON THE NATIVE PASTURE
Abstract
The State of Rio Grande do Sul, southem Brazil has 10 million hectares of native pastures and soils with high acidity and phosphorus deficiency, requiring liming and fertilization to improve productivity. An experiment was carried out at Centro de Pesquisas em Forrageiras, in São Gabriel county, Rio Grande do Sul, Brazil, aiming to study the residual effect of superficial liming and fertilization on dry matter yield of native pasture and on some soil chemical characteristics. A split-plot experimental design with randomized blocks and three replications was used. Treatments were limestone (zero, 4,3 and 8,6t.ha') with annual fertilization (45 kg.ha' de N, 110 kg.ha' de P2O5 e 60 kg.ha-' de K2O) and without fertilization and two depths (0-3cm and 3-6cm). The limestone was applied on February, 1994 and fertilizations were annual since February, 1994 until February, 1996. Soil and forage samples were collected by October, 1997. Fertilization showed a residual positive effect, increasing dry matter yield of native pasture. On the other hand, limestone application decreased exchangeable AI ¨3 and increased pH and availability of soil Ca" and Mr.
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