The effects of four plant growth regulators, indole acetic acid, gibberellin, cytokinin and Yunda -120 on the agronomic characteristics and some chemical components of upper tobacco leaves were studied in field around topping stage. The results showed that the stalk wide, the length and the width of leaves were significantly improved which were treated with 10 mg/L cytokinin and 30 mg/L indole acetic five days after topping, the treatment also reduced the content of nicotine, raised the total sugar and the total potassium and effectively adjusted the proportion of sugar to nicotine. It was well to improve the quality of upper tobacco leaves.
Guangxi Agricultural Sciences
plant growth regulator