Studies On Potassium Accumulation And Distribution Of Flue-Cured Tobacco In Potassium High Accumulation Efficiency Genotype

Field experiments were conducted to study the absorption and accumulation of potassium in flue-cured tobacco. The difference of potassium distribution in root, stem, and leaves with different stalk position between two genotypes were compared. The results showed that:1. Nongda202 is high accumulation efficiency genotype , NC89 is low accumulation efficiency and high utilization efficiency genotype.2.The total dry matter and potassium accumulation were continuously increased with tobacco growth in two genotype, and their accumulatiom with time during plant-growing period were shaped in S cures that could be described by exponential regression equations Y=ae-b/x.3.During plant-growing period, the potassium distribution rate of leaves in two genotype always was: leaves>stem>root.Nongda202 which was the high accumulation efficiency genotype, has many characteristics as follows:1. The total dry matter and potassium accumulation amount in Nongda202 was more than that of NC89, and so was that in root, stem and leaf.2. The development of the total dry matter and potassium accumulation amount in Nongda202 was synchronous, and there were the same phenomena in the root , stem and leaf of Nongda202.3. The dry matter and potassium accumulate amounts in root of Nongda202 was bigger than that of NC89. The root activity and the potassium absorption was better than that of NC89.4. The accumulation rate in leaf of Nongda202 was bigger than that of NC89 during every growth stages. The time of the decrease of potassium accumulation inleaf of NC89 was 70 days after transplanting. And the time of the decrease of potassium accumulation in leaf of Nongda202 was 80 days after transplanting. So the time of the decrease of potassium accumulation in leaf of NC89 was earlier than that of Nongda202. The time of the maximum potassium absorptive rate of NC89 (44 days after transplanting) was 8 days earlier than that of Nongda202 ( 52 day after transplanting), too. And the time of the maximum dry matter absorptive rate was later than the time of the maximum potassium absorptive rate. The maximum dry matter absorptive rate of Nongda202 was bigger than that of NC89, and so was the maximum potassium absorptive rate.5 .The allocation ratio of potassium in stem and root was smaller than that of NC89. and The allocation ratio of potassium leaf in of Nongda202 was bigger than that of NC89. The partitioning percentage in leaves with different stalk positions was bigger than that of NC89, and the partitioning percentage in leaves with different stalk positions of Nongda202 continue for a long time as positive .The partitioning percentage shows the increase (or decrease)-distribution rate of potassium in leaves with different stalk positions. The results show the potassium absorbing abilities of two genotypes are different. Nongda202 has high self-regulating ability for potassium distribution.