黔西南州烤烟钾含量分布及其影响因素

为深入了解黔西南州烤烟钾含量状况,研究了其烟叶钾含量分布特征及影响因素。结果表明,黔西南州烟叶钾含量变幅在0.82%~2.58%,平均值为1.77%,偏低;贞丰县、兴仁县烤烟钾含量极显著高于晴隆县;烤烟钾含量空间分布有从中部烟区分别向北和南两个方向递减的趋势。不同品种间烤烟钾含量差异达显著水平,云烟87品种的钾含量显著高于云烟97;烤烟钾含量有随着土壤粘粒含量升高而增加的趋势;随植烟土壤有机质含量升高,烟叶钾含量有降低的趋势;土壤p H在5.0~6.5或7.5以上,随植烟土壤p H升高,烟叶钾含量有升高的趋势;土壤p H在6.5~7.5或5.0以下,随植烟土壤p H升高,烟叶钾含量有降低的趋势。

Distribution of potassium content and its influencing factors of flue-cured tobacco in Qianxinan

Distribution of potassium content of flue-cured tobacco and factors affecting the distribution in Qianxinan region were analyzed. The results showed that the variation range of potassium content in flue-cured tobacco was from 0.82% to 2.58% with an average of 1.77% in the relative low-potassium tobacco planting area. The potassium content of flue-cured tobacco in Zhenfeng and Xingren counties were much higher than that in Qinlong county, indicating a gradual decreasing trend from the central planting region to the north and south planting regions in the spatial distribution. An extremely significant difference in potassium content of flue-cured tobacco among varieties was observed in which Yunyan87 had a higher level of potassium than Yunyan97. The potassium content increased along with an increase of the clay content and decreased with an increase of the soil organic content. The potassium content increased with an increase of soil pH in the range of 5.0 to 6.5 or above 7.5. The potassium content decreased with an increase of soil pH in the range of 6.5 to 7.5 or below 5.0.