Evaluation of the Seedling Growth Characteristics of Rice Varieties Direct Seeded under Submerged Conditions in Cold Climate Areas

Abstract

To clarify the varietal variation of seedling emergence in direct seeding culture, and the characteristics that contribute to the emergence in a cold climate, we tested seedling emergence in the soil at a low temperature using a nursery box, We also examined the germination characteristics and coleoptile elongation under anaerobic conditions in relation to seedling emergence. The emergence rate of seedlings from the soil at a low temperature was positively correlated with early plant growth and with the coleoptile elongation rate at a low temperature in anaerobic conditions. The germination coefficient in a cold Petri dish was positively correlated with the seedling emergence rate and early plant growth in the soil at a low temperature. However, the factor responsible for this correlation could not be clarified.