Corretivos da acidez e gesso na mitigaÃÃo dos efeitos da compactaÃÃo do solo na nutriÃÃo e produÃÃo do braquiarÃo e da soja cultivada em sucessÃo. / Acidity amendments and gypsum on the effects of soil compaction on the growth and production of braquiarÃo and soybean grown in succession.

AUTOR(ES)

Marcos Andrà Silva Souza

DATA DE PUBLICAÇÃO

2008

RESUMO

Compaction process, in addition to causing losses of soil physical features, interferes in a direct manner in the availability of nutrients and plantsâ growth. Few are the works which report alternatives to promoting the amelioration of that stress, mainly as the application of amendments, gypsum and crop succession are concerned. In this way, the present work was designed to evaluate the efficacy of soil amendment by the application of limestone, silicate and gypsum as an improver of the root environment on the effects of soil compaction in the nutrient uptake, growth and yield of a grass (braquiarÃo) and of a legume (soybean) grown in succession. The work was conducted in two phases: first â braquiarÃo cultivation and second â soybean cultivation, grown in succession in pots of PVC tubes 20 cm in diameter, composed of two rings: the lower ring (40 cm), received the soil under natural conditions; the upper ring (20 cm), received the soil with the treatments of densities, amendment and gypsum. The experimental design of the first phase was completely randomized in a factorial scheme 4 x 6 with 6 replicates. This is, four treatments were represented by the densities (1.0; 1.20; 1.40 and 1.60) and six treatments (with no amendment; gypsum; limestone, limestone + gypsum, silicate and silicate + gypsum). In the second phase, the same design was utilized in a factorial 4 x 6 x 2, with 3 replicates, this is, the treatments of densities and amendment of the first phase being the same, added of two management systems: with and without a previous cultivation of braquiarÃo. The pots of the system without any cultivation remained in fallow during braquiarÃo cultivation in the first phase. After the morphologic measurements, yield and quantification of macro and micronutrients and performed the statistical analysis were determined, it follows that the use of amendment and previous cultivation of braquiarÃo ameliorated the negative effects of compaction on the growth of braquiarÃo and soybean showing a reflex in their nutrient status.

ASSUNTO(S)

silicato densidade calcÃrio conditioner condicionador silicate density limestone ciencia do solo

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