《Table 6 Effect of corona field+dielectric separation on seed vigor of different hybrid rice varieti

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《Effect of Corona Treatment and Dielectric Separation on Seed Vigor of Hybrid Rice》

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Different letters in the same column indicate significant differences at the 0.05 level；the corona field intensity is 200 KV/m；the processing time is 4min；the speed of dielectric separation rotation drum is 30r/min；the separation voltage is 4 500V.

As shown in Table 6，there were significant differences in the seed vigor of the seeds of all grades after separating the seeds processed with corona field treatment，and the seed vigor increased significantly.Compared with the data in Table 5，the various seed vigor indicators of the seeds of all grades processed with corona field+dielectric separation were significantly higher than those for the seeds processed with dielectric separation alone.The seed vigor of Wangliangyou 6（2016）increased the highest.Compared with the seeds of Grade I，Grade II and Grade III separated from solely dielectric separation，those separated from the combined treatments had the germination potentials increased by 12，14 and 9 percentage points，germination rates increased by 7，8 and 10 percentage points，germination indexes increased by 18.97%，19.25%and 16.97%，vigor indexes increased by16.94%，31.61%and 55.51%，respectively.Therefore，the combination of optimal corona field process with dielectric separation could well improve the vigor of seeds of all grades.