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我国是一个畜牧业大国,随着社会的日益发展和人民生活水平的不断提高,规模化、集约化畜禽饲养呈急剧上升趋势。目前全国猪、牛、羊、禽存栏量分别为48570万头、11701万头、25587万只、380371万只,畜禽每年可提供粪尿24亿吨,其有效肥力相当于1888万吨尿素,4324万吨过磷酸钙和203
China is a big country of livestock husbandry. With the continuous development of society and continuous improvement of people’s living standards, the scale and intensification of livestock and poultry raising have shown a sharp upward trend. At present, the total population of pigs, cattle, sheep and poultry in the whole country is 485.7 million heads, 117.01 million heads, 255.87 million heads and 3.80371 million, respectively. Livestock and livestock can provide 2.4 billion tons of excrement and urine every year, and their effective fertility is equivalent to 18.88 million tons of urea. 43.24 million tons of superphosphate and 203