Effect of Hot Water and Sand Rubbing on Seed Germination and Growth in Sesbania rostrata
AbstractSesbania rostrata is a stem nodulating tropical legume which acts as a green manure in lowland rice farming systems. Due to presence of hard seed coat, seed germination was found to be extremely low in Sesbania rostrata. Thus the seeds were pretreated with hot water at difierent temperatures i.e. 30°C, 50°C, 70°C and 90°C for 10 minutes and scarification with sand for different time periods i.e. 10, 20, 30 and 40 minutes. The seeds pretreated with different treatments under different conditions exhibited the promoting effect on seed germination except in hot water at 90°C. The highest percentage of seed germination i. e. 88% was recorded when seeds were soaked at 70°C whereas 16.66% seed germination was found in control. In addition. among the different time periods for seed scarifying with sand, 40 minutes showed 77% germination. On the other hand. seeds soaked in hot water at 90°C exhibited complete inhibitory effect on seed germination. Plant growth was found to increase significantly in the plant obtained from seeds inoculated with Azorhizobium than the control.
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