A set of orthogonal experiments was conducted to study effects ofAnaerobic Fermentation Residues (AFR) on nitrate accumulation in rape and spinach, respectively.

• 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。