Effects of Multiple Cropping of Green Manure on Crop Yield and Soil Fertility

Multiple cropping with green manure Vicia vilosa as the fertilizer after wheat harvest was evaluated was regards the crop yield and soil properties.Multiple cropping with green manure could reduce the dosage of chemical fertilizer.The crop yield and variation of soil nutrient was studied.It was shown that the crop yield with 70% chemical fertilizer after the tillage and compaction of green manure with 2 000 kg/hm2was the same as that with 100% chemical fertilizer.Green manure could effectively reduce usage of chemical fertilizer.The multiple cropping of green manure could increase the content of soil N,organic matter,available P and available K.With the tillage and compaction of green manure and 70% chemical fertilizer,the soil organic matter,total N,available P,available K increased 1.93 g / kg,1.19 g / kg,7.9 mg / kg and 91 mg / kg compared with control,respectively.