频率及电压对高压脉冲电场提高陈年棉种活力的影响

为研究不同频率脉冲电场对陈年棉种活力的影响,该文利用高压脉冲电源和弧形电极-平板组成的电场系统在极间距离为50 mm、电压分别为16和20 kV条件下对陈年棉种在不同频率(1、5、10、20、50 Hz)下进行了电场处理,处理时间为40 s。结果发现,频率为10 Hz时,陈年棉种的发芽势、发芽率、发芽指数、活力指数等指标与不做电场处理对照相比都有明显提高,且都达到极显著差异(P0.01),16比20 kV条件下的处理效果更好,达到显著性差异(P0.05)。试验结果表明,电场频率对棉种活力指标的影响是存在的,且对各指标的影响趋势是一致的,即在一定处理条件下(电场强度与处理时间)可以找到一个较优频率范围,对种子活力提高达到最大,且该试验研究结果能够为后续种子电场处理提供参考。

Effects of frequency and voltage of high voltage pulsed electric field on improving vigor of aged cotton seed

Abstract: In order to explore the effect of the frequency of the pulsed electric field on the aged cotton seed vigor, high voltage pulse power supply and arc electrode were used to process aged cotton seeds with different frequency of 1, 5, 10, 20 and 50 Hz at the voltage of 16 and 20 kV, and the treatment time was 40 s. The results showed that the change trends of all indices were consistent for pulsed electric field with different frequency. When the frequency of the electric field increased, the effects increased and reached the maximum at 10 Hz. It could be seen that the electric field frequency had a threshold in this test condition. After 10 Hz, as the electric field frequency increased, the effects began to decrease. Compared with the CK, the germination potential showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 5, 20 and 50 Hz, but no significant difference at 1 Hz. The germination rate showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 5, 20 and 50 Hz, but no significant difference at 1 Hz. The germination index showed a very significant difference (P<0.01) at 5, 10 and 20 Hz, and a significant difference (P<0.05) at 50 Hz, but no significant difference at 1 Hz. The vigor index showed a very significant difference (P<0.01) at 5, 10, 20 and 50 Hz, but no significant difference at 1 Hz. In conclusion, when the voltage was 16 kV, the treatment effect was better at 10 Hz. The 4 indices of cotton seeds with the 10 Hz treatment were increased by 39%, 54%, 57% and 81% respectively in comparison with that of the CK. In comparison with that of the CK at the voltage of 20 kV, the germination potential showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 5 Hz, but no significant difference at 1, 20 and 50 Hz. The germination rate showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 1, 5 and 20 Hz, but no significant difference at 50 Hz compared with the CK. The germination index showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 1, 5, 20 and 50 Hz. The vigor index showed a very significant difference (P<0.01) at 10 Hz, and a significant difference (P<0.05) at 1, 5, 20 and 50 Hz. In conclusion, when the voltage was 20 kV, the treatment effect was better at 10 Hz. The 4 indices of cotton seeds with the 10 Hz treatment were increased by 28%, 43%, 38% and 62% respectively in comparison with that of the CK. The results showed that when the frequency was 10 Hz, the germination potential, germination rate, germination index and vigor index were significantly improved, and had very significant difference (P<0.01). The treatment condition of 16 kV was better than 20 kV. The results indicated that the effect of electric field frequency on seed vigor index existed, and the influence trend of each index was consistent. It means that there is an optimal frequency range when the electric field strength and processing time are determined. It can increase seed vigor to the maximum.