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Effects of Applying Biogas Fermentative Residue on the Physical and Chemical Characteristics of Soil

WANG Yuan-yuan et al(Biomass Energy Engineering Research Centre,School of Agriculture and Biology,Shanghai Jiaotong University,Shanghai 201101)  
[Objective] The purpose was to supply reference for the synthetic utilization of biogas fermentative residue.[Method] With pakchoi as tested material,the effects of applying biogas fermentative residue on soil nutrient and pH value were studied through conducting field comparative experiment of comparing applying biogas fermentative residues at high,middle and low dosages as base fertilizer with applying chemical fertilizer as base fertilizer and applying no fertilizer.[Result] After applying biogas fermentative residue,compared with CK,the contents of available K and P and alkaline-hydrolytic N in soil increased and the treating effect of biogas fermentative residue at high dosage(3×104 kg/hm2) was best.The available P content reached 93.670 mg/kg in the pakchoi seedlings growing for 7 d,the available K and alkaline-hydrolytic N contents reached 135.084 and 54.308 mg/kg resp.in the pakchoi seedlings growing for 35 d,which were significantly higher than that in CK.The pH values of soil in various treatments with biogas fermentative residue were lower than that in CK,and that in the treatment at high dosage was lowest,in 6.98~7.10.[Conclusion] Biogas fermentative residue could improve soil structure,increasing the capability of retaining water and fertilizer and permeability of soil and enhance soil fertility effectively.
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