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近年来,我省各地在杂交水稻制种田大量使用“九二○”已经造成了货源紧缺,供不应求,价格昂贵的状况。使用的浓度由20ppm提高到40ppm,甚至60ppm;使用的次数由1～3次增加到5～7次,每次用量由1～2克增加到3～4克,甚至更多;总用量高的每亩在10克以上,甚至达15克。这种高浓度、多频次喷施九二○的措施,无疑对于调节父母本花期和花时,加速抽穗、增加颖壳张开时间和角度,延长开花和授粉期,提高异交率、增加制种田的产量是起了积极作用的。但在高浓度、多频次喷施九二○后,已经出现了一些值得注意,并影响杂一代种子产量和质量的问题,这就需要我们对九二○重新加以评价和认识。
In recent years, extensive use of hybrid rice farming in various parts of our province has caused “shortage of supplies, shortage of supplies and high prices”. The use of the concentration increased from 20ppm to 40ppm, or even 60ppm; the number of times from 1 to 3 times to 5 to 7 times, each dosage from 1 to 2 grams to 3 to 4 grams or more; the total amount of high More than 10 grams per acre, even up to 15 grams. This high concentration and multi-frequency spraying campaign will surely speed up the flowering and flowering of parents and their flowering time and angle, increase flowering and pollination periods, raise the rate of out-crossing, and increase the rate of out-crossing. The output of farming has played a positive role. However, some problems that deserved our attention and affected the yield and quality of the hybrid seed have emerged after the high concentration and frequent spraying. This calls for our reassessment and understanding of the September 20 issue.