1. Magawo a feteleza wamankhwala omwe amatumizidwa kunja Magulu akuluakulu a feteleza wamankhwala aku China omwe amatumizidwa kunja ndi monga feteleza wa nayitrogeni, feteleza wa phosphorous, feteleza wa potashi, feteleza wapawiri, ndi feteleza wa microbial.Mwa iwo, feteleza wa nayitrogeni ndiye mtundu waukulu kwambiri wamankhwala ...
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