Txhais cov khoom siv tawv nqaij

Cov khoom siv tawv nqaij zoo nkauj yog cov khoom siv tawv nqaij ua los ntawm cov khoom xyaw ntuj. Cov khoom xyaw no feem ntau yog los ntawm ntuj, xws li cov nroj tsuag, ntxhia, thiab tsiaj rho tawm. Muab piv rau cov khoom siv tshuaj ua kom tawv nqaij, cov khoom siv tawv nqaij ua kom pom tseeb dua rau kev siv cov khoom siv ntuj thiab cov organic kom txo tau qhov khaus thiab lub nra ntawm daim tawv nqaij.