Cov cuab yeej siv chiv
Fertilizer ua tiav cov kab ntau lawm, suav nrog turner, pulverizer, granulator, rounder, kuaj tshuab, tshuab ziab khaub ncaws, txias, ntim tshuab thiab lwm yam khoom siv chiv ua tiav cov kab ntau lawm
Sau koj cov lus ntawm no thiab xa tuaj rau peb