1. Iindidi zezichumiso zekhemikhali ezithunyelwa kumazwe angaphandle Iindidi eziphambili zokuthunyelwa ngaphandle kwezichumiso zekhemikhali zaseTshayina ziquka izichumisi zenitrogen, izichumisi zephosphorus, izichumisi zepotash, izichumisi ezihlanganisiweyo, kunye nezichumisi zemicrobial. Phakathi kwabo, isichumiso se-nitrogen lolona hlobo lukhulu lweekhemikhali ...
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