Dinh Sy, N., Quang Minh, H. and Trang Viet, B. 2005. ROLES OF SOME ENVIRONMENT FACTORS AND PLANT GROWTH REGULATORS ON THE CHANGE IN NICOTINE LEVELS IN NICOTIANA TABACUM L. LEAVES. Science and Technology Development Journal. 8, 9 (Sep. 2005), 34-39. DOI:https://doi.org/https://doi.org/10.32508/stdj.v8i9.3068.