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自从1973年杂交水稻三系配套以来,“九二○”的施用越来越被重视。特别是近几年,把大剂量施用“九二○”自觉不自觉地当做制种繁殖高产的一大法宝。当然,众多的资料证明,它能使稻株节间伸长,稻株长高,降低包颈率,提高柱头外露率,促转弱势花,提高异交结实率,提高单产。然而,对“九二○”在繁殖制种的全价功用及其最佳施用剂量等方面,没有一个统一的认识。笔者兹就这个问题,结合多年的实践,谈谈粗浅的看法。
Since the three lines of hybrid rice in 1973, the application of “920” has been paid more and more attention. Especially in recent years, the use of large doses of “920 ” consciously or unconsciously as breeding a high yield of a magic weapon. Of course, many data prove that it can elongate the internodes of rice plants, increase the height of rice plants, reduce the neck-necking rate, increase the stigma exsertion rate, promote the weak flower, improve the rate of out-crossing and seed-setting, and increase the yield. However, there is no unified understanding of the “920” in the full price function of breeding seed and its optimal dosage. The author hereby on this issue, combined with years of practice, to talk about the superficial view.