Effect of nitrogen and sulfur levels on yield and quality forage in a native low-land pasture area in Southern Brazil

[摘要] - Nitrogen and sulfur fertilizations were evaluated in a native low-land pasture area (Planossolo) in southern Brazil, state of Rio Grande do Sul, for dry matter yield and crude protein contents, between Oct. 1996 and Mar. 1997. In a factorial treatment arrangement six levels of sulfur (0, 10, 20, 30, 40 and 50 kg/ha) were combined with four levels of nitrogen (50, 100, 150 and 200 kg/ha) topdressed to the pasture in Oct. 10, 1996. Two cuttings were made to determine dry matter yield and crude protein contents (Dec. 3, 1996 and Mar. 14, 1997). Results indicate that both factors increase the dry matter yield and crude protein contents on forage. With 35 kg/ha of sulfur was obtained the maximum dry matter yield. However at level of 200 kg/ha of nitrogen was not enough to obtain maximum dry matter yield. At levels of 200 kg/ha of nitrogen and 50 kg/ha of sulfur was not enough to obtain the maximum crude protein contents.

[学科分类] 兽医学

[关键词] forage;native pasture;nitrogen fertilization;sulfur fertilization   IntroduçãoA exploração de rebanhos pecuários constitui-se em uma atividade primária importante para a economia do Rio Grande do Sul;a qual se desenvolve em áreas de pastagens naturais que cobrem uma extensão aproximada de 12 milhões de hectares;constituindo o principal recurso forrageiro disponível para a produção animal neste estado