Effects of Combination of Organic and Inorganic Fertilizer on Crop Nutrient Utilization Rate,Nitrogen and Phosphorus Loss in Dry Land

Field plot experiment for two years was conducted to study the effects of pig manure,pig manure composting or biogas manure combined chemical fertilizer on nitrogen(N),phosphorus(P) loss and nutrient utilization rate in spring maize-cabbage rotation field.Results showed that combination of organic and chemical fertilizer could decline N loss,and the loss proportion of NH+4-N and NO-3-N accounted for 49.08%～52.02% of the total N loss.N loss amount decreased with increasing application amount of pig manure composting.Compared to chemical fertilizer applications,the combinations of pig manure composting N by 20% and chemical N by 80% could decline N loss from field by 28.95%,the N utilization rate for two years improved by 8.13%.On the other hand,the combinations of pig manure composting or biogas manure and chemical fertilizer could obviously decline N loss from field and improve utilization rates of P and potassium.Compared to chemical fertilizer applications,the combinations of pig manure composting N or biogas manure N by 20% and chemical N by 80% could decline P loss by 4.74% and 2.76%,the P utilization rate for two years improved by 1.06% and 2.75%,the utilization rate of potassium for two year improved by 2.62% and 11.48%,respectively.