现将省农科所、宜昌县农科所、武汉市东西湖农场等单位应用“优选法”的情况介绍如下: 优选“九二○”涂点棉花白花的合适浓度“九二○”是一种植物生长刺激素,应用于棉花涂花,可以促进棉花养分的输送,防止蕾铃脱落,增加单株成桃数,以提高棉花产量。过去,东西湖慈惠农场用“九二○”涂花,浓度掌握不当,致使棉壳增厚,棉绒减少,产量总是提不高,经过优选试验表明,“九二○”使用浓度20单位最好,棉桃大,表面光滑、不变形,单株成桃率达到100％。现在 Now the provincial Agricultural Science Institute, Yichang Agricultural Science Institute, Wuhan East Lake Farm and other units to apply the “preferred law” situation is as follows: The preferred “920” coated cotton white flowers appropriate concentration “920” is a Plant growth hormone, applied to cotton Tuhua, cotton can promote the transport of nutrients to prevent the fall off the buds, increase the number of peaches into individual plants to increase cotton production. In the past, Dongxihu Cihui Farm used the “920” Tuhua, improperly graded, resulting in thickening of the cotton shell, cotton linter to reduce the yield is always not high, after the preferred tests show that “920” concentration of 20 The best unit, cotton peach, smooth surface, no deformation, peach rate of 100%. just now