Background : Senna tora L. is a herbaceous plant affiliated to legumes. It has many components good for health with emodin, chrysophanol, aloe-emodin, physicion, rhein, obtusin. It is believed to have many medicine effects, as well as to good for the eyes. This study carried to find ou t the difference of characteristics on the growth according to the planting date used plugs. Plu g plants are very useful for transplanting. It gives well-management effects to the farmer such a s time, plant health, and maximum potential state during the raised time. Methods and Results : Plug plants had 30 days in raising seeding. The planting date was five time. Fist planting date was late April. The last planting date was early July. In their raising seeding period they were taken care of in the green house. And after 30 days, they were planted on the ground in planting density of 50*40cm sized area with three repeat treatments. When the raising seeding period, the length of plant and the length of leaf were the highest at the middle May, respectively. The number of leaf per plant was highest in late May as 11. In the planting period, the length of plant was highest at early July. The lowest was the length of plant at late May. Except the stem diameter in early April, they were no differences among other treatments and the stem diameter was the highest in early April. The number of node per plant could be found the most in middle May and late April. The number of node per plant was the lowest in early July. In the respect of yield, middle May had the highest yield than that of other treatments. It was 849.0kg/10a. The lowest was 740.6kg/10a in the early May. Conclusion : About the characteristics on the growth of Senna tora L. according to the planting date, the yield of middle May was highest than that of other date in this study. The planting date of late May had also shown strong tendency of optimum planting date. Therefore middle May and late May of planting date would be optimum planting date.

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