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ZHANG Xiao hai 1, YIN Duan 1, YU Shang qi 2, SHEN Hong 2, WAN Zhao liang 2 (1.Yunnan Tobacco Research Institute, Yuxi 653100, China; 2.College of Basic Sciences and Technology, Southwest Agricultural University, Chongqing 400716, China)  
In an isotope ( 36 Cl) tracing study of the distribution of Cl in flue cured tobacco plants, the leaf was found to contain 32.00% and 28.00%, respectively, more Cl than the root and the stem, absorbed Cl in the root, the stem and the leaf accounting for 9.02%,19.12% and 71.80% of the total Cl uptake by the plant, respectively. Cl content in the leaf increased with Cl rate. Compared with the rates of 0 (control), 1.0 and 3.0 g Cl/plant, the treatment of 5.0 g Cl/plant had 24.30%,12.20% and 8.54% higher Cl in its plant leaf. Cl utilization rate by the plant decreased with increase in Cl rate. Compared with the treatments of 1.0 and 3.0 g Cl/plant, the Cl utilization rate of the treatment of 5.0 g Cl/plant dropped by 68.31% and 32.10%, respectively. The dry weight of tobacco leaves increased with Cl rate up to 3.0 g/plant, which had a 39.81% and 32.92% higher leaf Cl than the control. However, further increase in Cl rate decreased leaf dry weight, the treatment of 5.0 g Cl/plant had 19.55% less Cl than the treatment of 3.0 g Cl/plant.
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