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

This study aimed to estimate optimal treatment for enhancing the germination rate and disinfections effect of organic wheat varieties, Jokyung, Geumgang, Saegumgang, and Baekgang using hot water treatment and lime sulfur mixture. Before disinfection, the germination rates of the seeds averaged 86.3±2.5% to 87.5±2.9%, while the infection levels caused by fungi and bacteria were observed to be 22.5±2.9% to 38.3±2.5% and 18.8±4.8% to 23.8±2.5%, respectively. The germination rates of four wheat varieties under hot water treatments were either the same or higher compared to untreated seeds. As the temperature and treatment time of hot water treatment increased, the contamination levels of fungi and bacteria decreased. The optimal hot water treatment for the seeds was observed at 55℃ for 10 minutes, resulting in germination rates averaging 90.0±0.0% to 97.5±2.9%, which were either the same or higher than untreated seeds. The disinfection effectiveness against fungi and bacteria was high, averaging 83.3~93.5% and 100%, respectively. Additionally, an investigation was conducted on the germination rates and microbial disinfection efficacy of 0.2% and 0.4% lime-sulfur mixture with varying treatment times, 3 to10 minutes for each wheat variety. As the treatment time elapsed, no significant differences in germination rates were observed among four wheat varieties. However, the germination rates were higher compared to the untreated group (86.3~87.5%), and the optimal treatment time was found to be 7 minutes or 10 minutes, resulting in an average reduction of 90.0~96.0% in contamination levels of fungi and bacteria. Therefore, the germination rates and disinfection effects varied depending on the treatment conditions of hot water treatment and lime-sulfur mixture applied for the disinfection of the four varieties of organic wheat seeds. However, it is considered that treating the seeds with hot water treatment at 55℃ for 10 minutes or with 0.2% or 0.4% lime-sulfur compound for 10 minutes enhances germination rates and reduces the contamination rate of fungi and bacteria compared to untreated seeds. Thus, these environmentally friendly seed disinfection technologies are likely to be highly useful in agricultural fields.