通过正交实验 ,分析沼气发酵残余物 (沼液、沼渣 )作为肥料 ,其施肥量、配施品种、施用方式等因素对油菜和菠菜硝酸盐积累的影响。影响菠菜硝酸盐积累的显著因素按作用程度大小依次为硫酸铵、沼渣和喷施沼液。油菜的显著因素依次为硫酸铵、沼渣和灌施沼液。并根据维持较高产量水平的基础上硝酸盐含量较低的原则 ,确定了优选的施肥方案。结果表明 ,采用沼渣作底肥 ,配合沼液追肥 ,生产的蔬菜满足高产和优质的双重目的 ,既利用了农业废物 ,避免沼气池的二次污染 ,又节约化肥 ,降低生产成本 ,具有一举数得的优点 Through orthogonal experiment, the effects of biogas residues (biogas slurry and biogas residue) as fertilizer on the accumulation of nitrate in rapeseed and spinach were analyzed. The significant factors affecting spinach nitrate accumulation were ammonium sulfate, biogas residue and sprayed biogas slurry in order of degree of action. The significant factors of rape are ammonium sulfate, biogas residue and biogas slurry. Based on the principle of lower nitrate content on the basis of maintaining a higher yield level, the optimal fertilization scheme was determined. The results showed that using biogas residue as base fertilizer and top dressing with biogas slurry could meet the dual purposes of high yield and good quality. It not only utilized agricultural waste but also avoided secondary pollution of biogas digester, saved fertilizer and reduced production cost, Advantages