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宋東錫,徐仁錫,許祥萬 順天大學校 農業科學硏究所 1995 農業科學硏究 Vol.9 No.-
Lodging has been recognized as one of major causes of yield reduction in rice culture. This experiment was conducted to investigate the relationships between physical characteristics of culm and lodging resistance of varieties in direct seeding on flooded paddy surface in rice plant. Ten varieties with different lodging resistance were grown in paddy fields and varietal occurrence of field lodging and lodging-related characteristics were observed. Seedling ratios were ranged from 73.7 to 74.6%, and number of seedlings per ㎡ were from 115 to 117 plants. Obongbyeo and S101 showed stronger resistance to field lodging whereas Daecheongbyeo and Palgongbyeo were susceptible to lodging. The lengths at the 3th, 4th and 5th internodes of semidwarf varieties were 2.3, 3.3 and 0.7㎝ shorter, respectively, than those of long culm varieties. The lodging resistant varieties, Obongbyeo and S101, showed lower values of lodging index from 1.11 to 1.15 than those of lodging susceptible varieties, Daecheongbyeo and Palgongbyeo ranged from 1.65 to 1.70. Bending moment with leaf sheath were greater in lodging resistant varieties, 1510.0∼1691.7 g·㎝, than those in the lodging susceptible varieties, 382.8∼557.1 g·㎝. Therefore, it is recommended to select a genotype with lower value of lodging index as well as higher value of bending moment for breeding lodging resistant varieties.