Investigation of dynamics in water infiltration in water absorption process of soybean seed

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Dried soybean seeds are prone to suffer waterlogging injury just after seeding if they are exposed to excess moisture. After 3 hr of waterlogging treatment, significant differences in seed survival were detected among cultivars. In addition, the passive imbibition during 10 - 30 min of waterlogging, and the capillary imbibition during 0 - 10 min of flooding were caused by significant differences in the imbibition rate among cultivars. Although neither imbibition showed a significant correlation with the survival directly, the ratio between the passive and the capillary imbibition rate was significantly correlated with survival. Factors affecting imbibition included the hydraulic conductivity of the seed coat and seed osmolarity, which were significantly correlated with the passive and the capillary imbibition rate, respectively.