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通过大田定位试验,研究连续5年紫云英利用后不同化肥施用量对水稻产量和稻谷经济效益及土壤碳、氮含量的影响。设6个处理,处理CK:不施紫云英和化肥(对照);处理CF:不施紫云英,施100%化肥(N、P2O5、K2O施用量分别为150、75、120 kg/hm2);处理A1:紫云英(22 500 kg/hm2,下同)+100%化肥+100%磷肥;处理A2:紫云英+80%氮、钾肥+100%磷肥;处理A3:紫云英+60%氮、钾肥+100%磷肥;处理A4:紫云英+40%氮、钾肥+100%磷肥。结果表明:施肥可以显著提高水稻产量,紫云英利用后化肥的增产效果更为显著,与CF相比,处理A2的早稻产量提高了7.7%,处理A3的水稻产量基本持平;紫云英利用后适当减少化肥用量可以增加水稻产值,与CF相比,处理A1的水稻产值增加了5.92%,处理A2的水稻产值增加效果次之,增加了4.08%;处理A4提高水稻土壤有机碳和全氮含量的效果明显优于处理CF,A2处理的土壤有机碳、全氮含量比CF显著降低。
Through the field experiment, the effects of different chemical fertilizers on the economic benefits of rice and the soil carbon and nitrogen contents after five years of continuous use of Chinese milk vetch were studied. The treatment of CK was as follows: No treatment of Astragalus mongholicus and chemical fertilizer (control); Treatment of CF: No treatment of Astragalus mongholicus, 100% chemical fertilizer (N, P2O5 and K2O application rates of 150, 75 and 120 kg / hm2, respectively) Treatment of A2: Asparagus officinalis + 80% of nitrogen and potassium fertilizer + 100% of phosphate fertilizer; treatment A3: Asarum + 60% of nitrogen, Potassium + 100% phosphate; Treatment A4: Aspen + 40% nitrogen, potassium + 100% phosphate. The results showed that the fertilization could significantly increase the yield of rice, and the yield increase effect of the chemical fertilizer after the use of Astragalus sinicus was more significant. Compared with CF, the yield of early rice with A2 treatment increased by 7.7% and the yield of rice with A3 treatment was basically the same. Compared with CF, the output value of rice increased by 5.92% compared with CF, and the increase of output value of rice increased by 4.08% after treated A2. The treatment of A4 increased the content of soil organic carbon and total nitrogen The content of soil organic carbon was significantly better than that of CF and A2 treatments, and the total nitrogen content was significantly lower than that of CF.