施钾量对烤烟钾积累与分配的影响

研究四川省凉山州主栽烤烟品种云烟85对钾的积累和分配特征，可为当地合理施用钾肥提供理论依据。以云烟85为材料进行土培盆栽和大田试验，分析了不同施钾量下云烟85的产量、含钾量、钾积累量和钾分配率，探讨施钾量对云烟85钾积累与分配的影响。结果表明，云烟85在不同钾肥用量下的钾积累高峰均出现在旺长后期和中部叶成熟期。随着钾肥用量的增加，烟叶产量、含钾量、钾积累量和钾分配率先增大后减小，含钾量和钾积累量差异显著。本试验条件下，种植云烟85的最佳钾肥用量为158kg／hm2。在凉山烟区种植云烟85时，可适当降低钾肥用量，并增加后期钾肥追施比例，在保证产量的同时，有望提高烟叶含钾量。

Influence of K Accumulation and Distribution of Flue-cured Tobacco under Various K Rates

In order to provide a theoretical basis for rational fertilization, we studied the K accumulation and distribution characteristics of flue-cured tobacco yunyan85 in Liangshan prefecture, Sichuan province. Yunyan 85 was used in soil culture and field experiment. Yield, K content, K accumulation and K distribution rate of yunyan85 were analyzed. The results showed that the K accumulation peak of yunyan85 appeared at the later vigorous growth stage and the middle leaf maturity under different K application rates. The yield, K content, K accumulation and K distribution rate of tobacco leaf increase at the first, and then decrease with the increase of K application rate. The optimum K application rate was 157 kghaa for yunyan85. In conclusion, for yunyan85, we should properly reduce the application rate of K and increase the dressing proportion of K in the late growth stage, which can improve the K content of tobacco leaf and ensure the yield in Liangshan.