一头成年黄牛平均每天排泄粪便25公斤,其中牛粪15公斤,尿液10公斤。新鲜牛粪含有机质14.3%,含氮0.32%,含磷0.25%,含钾0.15%,新鲜尿液含有机质3%,含氮0.5%,含磷0.03%,含钾0.65%。一头牛一年排泄粪便9000公斤左右,含氮素相当于75公斤硫铵,含磷素相当于55公斤过磷酸钙,含钾素相当于74公斤硫酸钾。因为牛是反刍动物,牛粪质地细密,碳氮比值较大,不易分解和腐热,发热量很少,俗称为“冷性肥料”。因此,积造牛圈 An adult cattle excreted an average of 25 kg of manure per day, of which 15 kg of cow dung and 10 kg of urine. Fresh cow dung contains organic matter 14.3%, nitrogen 0.32%, phosphorus 0.25%, potassium 0.15%, fresh urine containing organic matter 3%, nitrogen 0.5%, phosphorus 0.03%, potassium 0.65%. A cow excretion of about 9000 kg a year, containing nitrogen equivalent to 75 kg of ammonium sulfate, phosphorus equivalent to 55 kg of superphosphate, potassium equivalent to 74 kg of potassium sulfate. Because cattle are ruminants, cattle manure texture fine, larger carbon and nitrogen ratio, not easy to decompose and decay heat, less calories, commonly known as “cold fertilizer ”. Therefore, bullpen buildup