Nutrient Resource Calculation and Land Carrying Capacity Analysis of Pig Manure and Urine in China
Based on the development status of China's pig breeding industry,the total amount of feces and urine resources excreted by pigs,which were referred to meat hogs and breeding sows in this thesis,in China was estimated by the method of excretion coefficient through reviewing the literature,whose nutrient content was used to calculate the land carrying capacity.The results showed that in 2021,the total amount of pig feces and urine generated in China reached 516 958 800 tons,of which feces and urine accounted for 28.14％and 71.86％respectively,and could supply 2 303 900 tons of nitrogen and 576 100 tons of phosphorus after the collection,stor-age and treatment process.At the same time,when manure was used to replace 40％fertilizer application crop on the calculation,the total farming land in China could bear 1.92 billion pigs and 1.89 billion pigs according to the account of N,P,respectively,of which Xin-jiang,Inner Mongolia and Heilongjiang feeding bearing space was huge.Beijing,Hainan and Yunnan feeding bearing capacity was low.In summary,the national pig farming and manure resources were unevenly distributed,but the total amount of manure and urine re-sources was huge,and the carrying capacity of fecal soil was relatively large.It was essential to speed up the optimization of the breed-ing layout,promote the resource utilization of livestock and poultry manure,improve the utilization rate of manure,and combine planting and raising to achieve the green sustainable development of animal husbandry ultimately.
pigsfeces and urine resourcesthe method of excretion coefficientnutrient contentland carrying capacity
万方数据
维普
