Application of biofertilizers from dairy livestock in planosols

Abstract

Since bovine dejects contain significant quantities of nitrogen and phosphorus, their inadequate management causes eutrophication of water bodies and soil pollution. However, their correct management is beneficent to soil and crops, and reduces the use of conventional chemical fertilizers. Current study evaluates the application of biofertilizers from a dairy Livestock Water Residue (LWR) within the physical and chemical characteristics of planosols. Assay was undertaken on the EMBRAPA Gado de Leite experimental farm in Coronel Pacheco MG Brazil. Four doses (0, 10, 20, 30 kg ha-1 N) of bio-fertilizer and NPK 30-00-20 were applied in corn crops. Texture, pH, density, electric conductivity, organic matter (OM), effective (CTCt) and potential cationic exchange capacity (CTCT), sum of bases (SB), saturation by aluminum (m) and by bases (V), exchangeable rates of Ca, K, Mg, N and disposable rate of P at 0 - 20 cm layers of soil were evaluated. Bio-fertilizer doses of LWR provide similar effects to conventional fertilization in the soil with regard to macronutrient, micronutrients and fertility indexes. Results show that the partial replacement of conventional nitrogen fertilization by LWR bio-fertilizer is possible.