1. Pawg ntawm cov tshuaj chiv xa tawm Cov khoom tseem ceeb ntawm Tuam Tshoj cov tshuaj chiv xa tawm muaj xws li nitrogen chiv, phosphorus chiv, potash chiv, compound chiv, thiab microbial chiv.Ntawm lawv, nitrogen chiv yog hom tshuaj loj tshaj plaws ...
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