关键词: 钾肥, 烤烟, 红花大金元, 云烟300, 钾肥追施比例, 生长, 产量, 质量

Abstract:

In order to explore the differences in growth, yield and quality of the new flue-cured tobacco variety Yunyan 300 with Honghuadajinyuan, and to find out the ratio of potassium fertilizer topdressing suitable for Yunyan 300, Honghuadajinyuan and Yunyan 300 were used as materials, and the treatment without topdressing potassium sulfate was set as the control. Different ratio of potassium were applied to roots at 20, 40 and 50 days after rosette (CK=0:0:0; T1=5:4:1; T2=3:4:3; T3=1:4:5), and a total of eight treatments were set. The results showed that, with the increase of the ratio of potassium fertilizer topdressing 20 days after rosette, the plant height, stem girth, bottom leaf length, bottom leaf width, cutter leaf length, cutter leaf width, single leaf weight, leaf density, reducing sugar content, total sugar content, potassium content, potassium- to-chloride ratio, yield, output value, average price and the proportion of middle and high tobacco of Honghuadajinyuan and Yunyan 300 all showed a trend of first increasing and then decreasing. Under T2 treatment, compared with Honghuadajinyuan, the plant height, top leaf width, single leaf weight, reducing sugar content, total sugar content, potassium-to- chloride ratio and output value of Yunyan 300 increased by 5.74%, 4.24%, 3.81%, 5.04%, 4.05%, 4.78% and 3.08%, respectively, and nicotine and chlorine content decreased by 11.79% and 3.45%, respectively. In summary, the growth, yield and quality of Honghuadajinyuan and Yunyan 300 were the best under the treatment of the top dressing of potassium fertilizer=3:4:3 treatment. The part of agronomic traits, physical properties, chemical composition and economic traits of Yunyan 300 were better under the same top dressing ratio of potassium fertilizer.

Key words: Potassium fertilizer, Flue-cured tobacco, Honghuadajinyuan, Yunyan 300, Topdressing ratios of potassium fertilizer, Growth, Yield, Quality