Investigation on Potential of Replacing Chemical Fertilizer for Crop Straw and Livestock Manure Organic Fertilizer in Shandong Province
[Objective]The quantity and total nutrient of crop straw,livestock and poultry manure resources were calculated,and their potential to replace chemical fertilizers was estimated,so as to provide the data support for the overall and rational utilization of organic fertilizer resources in Shandong.[Method]Based on the crops(wheat,corn,rice/rice,soybean,potato,peanut and cotton)and livestock/poultry(cattle,pig,sheep,poultry and rabbit),the grass-grain ratio and excretion coefficient methods were used to calculate the total amounts of organic fertilizer and total nutrients in Shandong in 2020,and the potential of organic fertilizer replacing chemical fertilizer was estimated.[Result](1)In 2020,the total amount of straw resources was 7 616.8×104 t,and the total amount of nutrients was 163.2×104 t,in Shandong.The theoretical potential of straw nutrients to replace chemical fertilizers was 42.9%,while the actual potential was 20.9%.The theoretical potential of N,P2O5 and K2O in straw to replace chemical fertilizers was 35.3%,9.0%and 92.2%,respectively,while the actual potential was 12.5%,4.2%and 53.7%,respectively.The total amount of straw resources increased by 16.8%from 2016 to 2020.(2)In 2020,the total amount of livestock and poultry manure resources was 9 131.2×104 t,the total amount of nutrients was 82.7×104 t,in Shandong.The theoretical potential of livestock and poultry manure nutrient resources to replace chemical fertilizers was 21.7%,and the actual potential was 19.5%;the theoretical substitution potential of N,P2O5 and K2O resources in livestock manure was 19.6%,11.4%and 36.4%,respectively,while the actual substitution potential was 17.7%,10.3%and 32.9%,respectively.From 2016 to 2020,the total amount of livestock and poultry manure resources decreased by 25.4%.(3)The theoretical potential of crop straw and livestock manure nutrients in different regions of Shandong to replace chemical fertilizers was as followed:Northwest Shandong＞South Shandong＞South Central Shandong＞Central Shandong＞East Shandong.Northwest Shandong and South Shandong were with the highest potential of 77.0%and 75.6%,respectively;East Shandong was with the lowest of 46.5%.Among them,Dezhou had the greatest potential of 95.3%,followed by 92.6%of Dongying and 91.2%of Binzhou.Yantai and Weihai were with the smallest of 35.5%and 40.6%,respectively.(4)The theoretical potential of different types of resources of crop straw and livestock/poultry manure nutrients to replace chemical fertilizers were as followed:corn(16.7%)＞wheat(16.2%)＞potato(4.9%)＞peanut(3.6%)＞rice(0.7%)＞cotton(0.4%),soybean(0.4%)＞cow manure(8.7%)＞pig manure(6.5%)＞sheep manure(3.2%)＞poultry manure(3.2%)＞rabbit manure(0.1%).[Conclusion]In 2020,the total amount of straw and livestock manure resources was 16 748.0×104 t,and the total amount of nutrients was 245.9×104 t,in Shandong.The theoretical potential of straw and livestock manure nutrient resources to replace chemical fertilizers was 64.6%,and the actual potential was 40.4%.The theoretical substitution potential of N,P2O5 and K2O in straw and livestock manure was 54.8%,20.4%and 128.6%,respectively,and the actual substitution potential was 30.2%,14.5%and 86.6%,respectively.The organic fertilizer resources of crop straw and livestock manure in western,northern and southern Shandong were very rich,while those in central and eastern Shandong were relatively few.There were more organic fertilizer resources of crop straws,such as corn and wheat,and more organic fertilizer resources of livestock,and poultry manure,such as cattle and pigs.Efficient and rational use of organic fertilizer resources,such as crop straws and livestock and poultry manure,was an important guarantee for reducing fertilizer application and increasing efficiency.
crop strawlivestock manureorganic fertilizer resourcepotential to replace chemical fertilizerShandong Province
万方数据
维普
