Effect Of Different Potassium Application Rate And Different Potassium Fertilizer On The Growth Of Flue-cured Tobacco In Cinnanon Soil Area

Experiments in pot and field were carried out to study the effect of different potassium application rate and different potassium fertilizer on the growth of Flue-cured tobacco in Cinnanon soil area with NC89 at Xiangcheng tobacco company of Henan province from 2001 to 2002. The results are as follows. 1 Effect of different potassium application rate on the growth of Flue-cured tobacco.The different potassium application rate has no significant influence on the botanic characteristic of Flue-cured tobacco. With the increasing of potassium application rate the dry matter of the roots, stalk and leaves is increasing. The NR activity and root activity are enhanced and the leaf ability of composing chlorophyll during the prophase of the growing process is increasing by using the potassium fertilizer. Potassium can adjust the SOD activity and increase the SOD activity during the prophase and metaphase of the growing process. The invertase activity of 75 days after transplanting is lower than the invertase activity of 60 days after transplanting. The invertase activity is increased by using the potassium fertilizer, but the difference among the different potassium application rate treatments is small. With the lowering of the stalk position (from the first leaf to the ninth leaf) the invertase activity is decreasing. The ATPase activity of root is increasing by using potassium fertilizer, but the ATPase activity of root is decreasing with the growing of the plant.The potassium contents of roots, stalk and leaves are increasing with the increasing of the potassium application rate, but the potassium contents of roots, stalk and leaves show the falling current with the growing of the plant. The accumulation amount of roots, stalk and leaves are increasing with the growing of the plant. The accumulation amount of roots and stalk are rising with the increasing of the potassium application rate. Though the leaves accumulation amount of potassium is rising with the increasing of the potassium application rate, effect on the accumulated amount of potassium is not distinct when the potassium application rate was 7.5g per plant. The distribution ratio of roots is enhanced with the increasing of potassium application rate and the ratio ranges from 6.32% to 8.74%. The ratio of potassium distributed in stalk ranges from 21.35% to 24.35%. The distribution ratio of leaves is declined with the increasing of potassium application rate and the ratio ranges from 67.69% to71.89%.Though the potassium contents of tobacco pith in pot are increasing with the increasing of potassium application rate, the contents are declined with the development of tobacco. The potassium application level has no significant effect on the potassium contents of the flue-cured tobacco flowers.Contents of potassium in leaf and leaf veins increased with the increasing of potassium application rate. Contents of potassium in leaves at lower stalk position were higher when potassium supply was enough, however, that were higher in leaves at upper stalk position when potassium supply was lower.Contents of readily-available potassium, slow-release potassium and total potassium in soil increased with the increasing of potassium application rate. The residual readily-available potassium soil and the potassium fixed by soil are also increasing with the increasing of potassium application rate. The content of total potassium in soil changes little in the total growing period of tobacco.Contents of acid aroma components and medium aroma components were increased by using potassium fertilizer.Contents of nicotine and total nitrogen are increasing with the increasing of potassium application rate, however, that is no effect on the contents of chlorine ion. The contents of total sugar and reduce sugar are rising by using potassium fertilizer. Using potassium fertilizer has no effect on the output of tobacco leaves, but the ratio of medium and superior leaves is increased.The results showed that, when the potassium application rate is 7.5g per plant (tr...