Optimization of Priming for Improving Germination of Sesame Seed under Different Soil Conditions
2011
Kim, S.H., Gyeongsang National University, Jinju, Republic of Korea | Kim, K.M., Gyeongsang National University, Jinju, Republic of Korea | Shim, S.I., Gyeongsang National University, Jinju, Republic of Korea
An improvement of seedling establishment in field is necessary for stable seed production in sesame. Adverse environmental conditions such as low temperature, drought, and high temperature cause additional labor inputs of reseeding or thinning after germination for adjusting optimal plant density. This research was conducted to elucidate appropriate priming processes including choice of priming material for improving seedling establishment of sesame under adverse temperature and various soil texture with different moisture content. Priming treatment of -1.1 MPa with PEG 6000 showed germination percentage of 60% that higher than the control (27%) under low temperature (14℃) and dry soil condition (12.5% soil moisture). It was also suggested that the treatment with PEG 6000 (-1.1 MPa) and 0.5M NaCl in sandy/clay loam improved germination percentage of sesame. In clay loam soil, PEG 6000 treatment of -0.5 MPa showed relatively high germination percentage (58%), which was more effective to increase germination than other treatments applied in the experiment. At higher temperature of 23 and 26℃ in clay loam soil the germination percentages of sesame seeds treated with 50 mM K₃PO₄, 150 mM KCl, and 250 mM Ca(NO₃)₂ showed the highest value at the soil moisture content of 10, 12, and 15%, respectively. Priming treated seeds showed enhanced germination at low temperature in sandy loam soil. In general, the critical soil moisture content required for germination in sesame seed was 12.5% as the temperate was higher than 20℃.
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