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南方稻区杂交水稻制种产量最高的县——四川省江油县1982年不育系繁殖产量达到亩平305.8斤,制种产量达到亩平336.1斤。江油县杂交水稻繁殖、制种,产量高的重要措施之一,是正确使用“920”。江油县经过1979～1982连续四年的系统试验,对“920”的喷施时间、浓度、次数以及割叶的方法等都摸索到一套比较完整的经验。主要有如下几点。一、喷施时间。珍A割叶后,对“920”喷施时间极为敏感,以割叶当天喷第一次最为关键。随喷施时间推迟产量递减,割叶后第三天喷比割叶当天喷减产7.4～11.2％;五天喷的减产13.1～23.9％;割后第三天、第五天各喷一次的亩产(221斤)比割叶当天喷一次的(229.4斤)还要
The highest yielding hybrid rice seed production in the southern rice region - Jiangyou County, Sichuan Province in 1982 breeding output of sterile CMS reached 305.8 kg mu, seed production reached 336.1 kg mu level. Jiangyou hybrid rice breeding, seed production, high yield one of the important measures is the correct use of “920.” Jiangyou County, after 1979 ~ 1982 for four consecutive years of systematic testing, “920” spraying time, concentration, frequency and cut the leaves of the method to find a more complete experience. The main points are as follows. First, spraying time. Jane A cut leaves, the “920” spraying time is extremely sensitive to the first day to cut leaves the most crucial spray. With the spraying time delayed production decline, the third day after cutting leaf spray cut than the same day spray cut 7.4 to 11.2%; five-day spray cut 13.1 ~ 23.9%; cut the third day, the fifth day after spraying each mu Production (221 pounds) than cut the same day sprayed (229.4 pounds) even more