The Korean Journal of Crop Science ISSN:0252-9777(Print) 2287-8432(Online) 한국작물학회지

In order to develop a safe seeding technology for low-density transplantation, we analyzed the changes in seeding growth according to different seeding rates and seeding days. We detected changes in leaf number and shoot diameter on the 10th seeding day, and in plant height on the 20th seeding day according to seeding rate. The increase in shoot and leaf number, and shoot diameter per seeding day decreased with anincrease in seeding rate. On seeding day 20, the reductions in shoot and root dry weights according to seeding rate was lower compared with those recorded at seeding day 10. Shoot dry weight was significantly related to root dry weight, plant height, and shoot diameter. With an increase in seeding rate, seeding health decreased and there was an increase in the rate of seeding health per seeding day decreased. For low-density transplantation, the optimal number of seeds required for transplanting 3–5 plants per hill is 11,000, which is estimated to be approximately 280–300 g of seeds for 22 g brown rice. Furthermore, the appropriate number of seeding days is estimated to be 13 to 16 days, which corresponds to a small reduction in seeding health.