The main environmental issues are controlling runoff from manure storage sites into water supplies , controlling nitrate and phosphorus contamination of surface and ground water , and the transmission of zoonotic diseases when manure is sold and transported to villagers for fertilizer 主要的環(huán)境問題是控制糞便儲存地的糞便流到水供應(yīng)系統(tǒng)中,控制對地上和地下水的硝酸鹽和磷污染,控制當(dāng)糞便出售給并運(yùn)到村民手中作肥料時動物傳染病的傳播。