Utilization of bio-methanated distillery spent wash and bio-compost for sugarcane production and improving soil fertility.

摘要

A field study was undertaken on spring sugarcane at Pusa, Samastipur, Bihar (India) to assess the effect of bio-methanated distillery spent wash (BMDSW), bio-compost and FYM as a source of plant nutrients and their effect on soil properties, yield, nutrient uptake and juice quality and sugarcane during 2010-11. The treatments comprised substitution of K.0 at 0, 25, 50, 75 and 100% through BMDSW, bio-compost and FYM (at 20 t/ha) with recommended dose of fertilizer. The spent wash was characterized. The raw spent wash was acidic in nature with high EC and rich in plant nutrients. The BMDSW was neutral, (pH 7.31) rich in nutrient viz., nitrogen 0.40%, phosphorus 0.082%, sulfur 0.82% and potassium 9.25% on oven dry basis and also contains micro nutrient. The bio-compost was neutral in nature, rich in plant nutrients with C:N ratio of 13:1. The application of BMDSW, bio-compost and FYM along with inorganics significantly increased cane yield over inorganic alone. The uptake of nutrient, viz., N, P and K followed the similar trend of cane yield. The highest cane yield was recorded in treatment receiving 100% K₂O through BMDSW and lowest in control. The result indicated that integrated use of BMDSW and bio-compost was superior in terms of improving cane yield. The juice quality parameters, viz., brix, pol and purity remain unaffected. The effect of organics on commercial cane sugar was found significant. The application of different doses of BMDSW and biocompost significantly increased the EC, organic carbon and available macro (N, P and K) and micro nutrients (Fe, Zn, Cu and Mn) content of the post harvest soils. It also enriches the organic matter content and soil physical environment. The significant improvement was observed in hydraulic conductivity, infiltration and aggregation of soil in organics treated plots. Thus, application of either bio-methanated spent wash or bio-compost in combination of inorganic fertilizer brings significant improvement in soil fertility and enhances the productivity of sugarcane in calcareous soil.