... Quan diem thii nhat cho rang chat thom dugc tao ra tir cac hgp chat aldehyde (CHO) va ceton (C = O) va cac hgp chit luu huynh (Tsuzuki, 1997). Quan dilm thir hai cho rang chat thom ciia ... qua cho thay 100% sd gidng ciia ca 3 nhdm deu bj nhiem ray. Theo ket qua thanh Igc gidng khang ray nau trong nha ludi ddi vdi 200 gidng dja phuong cua Vien KHKT NN MN nam 1991 cho ... chuyen ve bdng, sd cdn lai duy tri d cac bd phan khac. Bdn K lam cho than cay liia ciing hon, khdng dd nga. Mat khac K giup cho cay lua tang khdi lugng hat, giam ty le lep, tang tich luy...