采用大田试验,在河南驻马店烟区研究了钾肥施用方式对烤烟钾素利用及土壤钾含量的影响.结果表明,在施钾量相同条件下,随着钾肥的追施比例和追施次数增加,不同部位的烟叶含钾量均增加,尤其是上部叶钾含量显著增加,2次或3次追钾比1次追钾处理上部叶钾含量分别提高18.9％ ～ 26.9％、35.0％ ～41.1％,使耕层土壤供钾能力在整个烤烟生育期内持续稳定在较高水平,并减少了土壤钾素下移,增加了烟株总吸收钾量,显著提高了钾素的利用效率,以钾肥基追比3∶7、分3次追钾处理钾素利用效率最高,达45.48％.%Field experiments were carried out in Zhumadian of Henan province to study the effects of different fertilization measures of K fertilizer on K utilization efficiency of flue-cured tobacco and content of soil K. The results showed that under the same amount of K application, the K contents of tobacco leaves of different position increased with the proportion of base fertilizer and the frequency of topdressing increasing. The K content of upper leaves especially increased significantly, for example, the treatment of frequency at 2 or 3 times promoted by 18. 9% - 26. 9% ., 35. 0% ~ 41. 1% respectively than the treatment of topdressing once. The result was that K applying ability of topsoil remained a high level in the whole growth period of tobacco. What's more, it inhibited soil K moving down and increased the total K uptake, promoted the K utilization efficiency significantly. The highest K utilization efficiency was 45. 48% when the ratio of basal K to topdressing K fertilizer at 3: 7 and the frequency of topdressing at 3 times.
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