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Background : Rehmannia glutinosa L. that is a perennial plant belonging to the family Scrophulariaceae is one of the most popular local income crops. Recently, the cultivation area of Chungnam (2017) accounts for 50.5% (106 ha) of the whole country. In July and August, which is the off-season at the highest price of R, glutinosa L. This experiment was carried out to develop early harvest cultivation technology for the improve farm income.
Methods and Results : In order to investigate the growth characteristic and yield of R, glutinosa L. by using the rhizome of 'Tokang' were transplanted four times at intervals of 10 days from mid-March to mid-April 2017 and 2018. Growth characteristics of the above and under ground part were investigated by 3 repetitions for 10 ea harvested in mid-July. Regression analysis was performed on the relationship between the planting time and fresh root weight. The highest emergence rate was 88.7% in the mid-March, and the highest above ground part growth was observed in the plant height, leaf number, leaf length, leaf width, and fresh leaves weight. The number of days to flowering tended to be shortened to 60, 53, 52, and 49 days from the mid-March to the mid-April. The growth of underground part was also highest in mid-March and the total root weight per 10 a was also 1,127.4 ㎏ in mid-March. The faster the planting time, the higher the yield. The results of the linear regression on the roots weight according to the planting time showed that there was a negative correlation relation between the planting time, the marketable roots weight, rhizome weight and total roots weight.
Conclusion : The total roots weight improved by 80% in the mid-March than mid-April. Therefore, mid-March is considered optimal planting time for off-season production of R. glutinosa L.
