Efeito residual do calcário sob diferentes modos de incorporação antes da instalação do sistema plantio direto

• Autor(a) principal: Prado, Renato De M. [UNESP]
• Data de Publicação: 2003
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/S1415-43662003000300012; http://hdl.handle.net/11449/211633
• topic: Soil management; liming; Glycine max; preparo do solo; calagem; Glycine max

The deep incorporation of the lime at the time of installation of the no-tillage system may present a residual effect in the soil benfitial for the crops. The present work was conducted to test the residual effect of limestone incorporation on the production of the soybeans. For this purpose, an experiment was conducted on a clay textured distrophic Red Latosol, in Uberlândia, MG. A completely randomized block design in a split plot arrangement was used. The main plots were constituted by mode of incorporation of the lime: heavy disc plows (14 discs of 34) and disc harrows (60 discs of 22); traditional way, with disc plow (4 discs of 26) and disc harrows; superheavy disc plows (14 discs of 34) and disc harrows; in split plots, the doses of lime: 0, 6.0 and 9.2 t ha-1 were studied. The incorporation of the lime occurred in May/1995, and in the subsequent agricultural years black oats (1995/96) and maize (1996/97) were cultivated in no-tillage system. In year 1997/98, the residual effect on the production of soybeans was evaluated. The incorporated lime at the occasion of the installation of the no-tillage system had positive residual effect in the production of soybeans. The deep incorporation of the lime was more effective with use of the superheavy disc plows and the heavy disc plows revealed inefficient.