... ca cỏc loi than s dng nghiờn cu ó cho thy ba loi than cú chua khỏc nhau, c th l than lung cú pHKCl cao nht mang tớnh cht hi kim, cũn than x da cú pHKCl thp nht mang tớnh chua cũn than tru mang ... tớnh cht hi chua (Bng 1) Cỏc loi than cng cha mt hm lng cỏc cht N, P, K, Ca, Mg nht nh ỏng chỳ ý l hm lng K than x da v than lung khỏ cao, cao hn nhiu so vi K than tru Gm cỏc loi TSH to t v tru, ... v c ch nh hng ca TSH n sinh trng lỳa Sinh kh i (g/khúm) 50 Than lu ng Than d a Than tr u 40 Lo i: ns L ng: ** Lo i x L ng: + 30 20 10 0 10 20 30 L ng bún (g /kg t) th Sinh lỳa thi k thu hoch...