一头猪每年可排粪尿四千多斤,这些粪尿约含氮素二十斤,相当于六十斤硫酸铵的纯氮量。用这些肥料肥田,可增产粮食二百多斤。生产实践证明:猪肥肥效高、肥效长,能改良土壤,增加团粒结构;它含的氮、磷、钾比牛、马、羊粪尿的含量高,是农家肥料的主要来源之一。为充分发挥猪肥料的作用,猪圈要注意垫土、垫秸秆、垫青草等,以吸收保存肥分。每次起猪圈粪,最好在圈外再堆积一 A pig can excrement urine more than 4000 kilograms per year, these excrement about twenty tons of nitrogen, equivalent to six pounds of ammonium sulfate, the amount of pure nitrogen. Fertilizing these fields with fertilizers can increase grain yield by more than 200 jin. Production practice shows that pigs have high fertilizer efficiency and long effective fertilizer, which can improve the soil and increase the aggregate structure. Nitrogen, phosphorus and potassium contained in the pigs are higher than cow, horse and sheep manure and are one of the main sources of farm fertilizer. In order to give full play to the role of pig fertilizer, pigsty should pay attention to pad soil, pad straw, pad grass, etc., to absorb and save fertilizer points. Every time from the pig circle shit, it is best to accumulate in circles outside one