“920”的使用,不仅解决了不育系包颈问题,还具有增大开颖角度、提高柱头外露率等作用。在如何正确使用“920”的问题上,各地众说纷纭,但都认为加大水量是发挥“920”作用的一个重要途径。一次偶然的机会,我们发现:低水量(高浓度)喷施“920”的效果极佳,于是,在1987年的春、秋两季制种中,我们对V20A、珍汕97A、D汕A、协青早A等主要不育系进行了低水量喷施“920”试验。 The use of “920” not only solves the problem of the neck of the sterile line, but also has the effect of increasing the open angle and increasing the stigma exsertion rate. There are different opinions on how to properly use the “920”, but all think that increasing the amount of water is an important way to play the role of “920”. By chance, we found that spraying “920” with low water (high concentration) was very effective. Therefore, in the spring and autumn seasons in 1987, we conducted a survey on V20A, Zhenshan 97A, Danshan A , Xie Qingzao A and other major CMS lines were sprayed with low-water “920” test.