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近年来,在日本主要畜产区开展了一场“土地—牧草—牛”的有机循环生态保护运动。按照常规人工养殖方式,人们是将牛群产生的粪尿进行人工回收,不经任何加工处理就散布在牛舍附近的草场里。实践证明,因长期采用这种粗放处理方式,使草场上剩余许多尚未充分分解发酵的牛粪,造成牧草中残留大量的硝酸态氮。倘若给牛食用这种牧草,时常发生牛中毒以致死亡的事例。同时,
In recent years, a “Cycling - Pasture - Cattle” organic recycling eco-protection campaign has been launched in major livestock areas in Japan. According to the conventional method of artificial breeding, people manually recycle the excrement and urine generated by the herd and scatter it in the pasture near the barn without any processing. Practice has proved that, due to long-term use of this extensive treatment, so that many of the remaining grassland has not yet fully decomposed fermented cow manure, resulting in a large number of residual nitrogen in the pasture nitrate. If the cattle eat this pasture, cow poisoning often cause fatal cases. Simultaneously,