提高玉米杂交制种产量及种子质量的五个关键技术措施（三）２花期预测及促控调节：为避免异常情况造成父母本抽雄吐丝不协调，应在生育过程中进行花期预测，以便采用相应措施进行调节。①预测方法：叶龄差观察法：６叶前可选代表地块中的代表株定点定株直接观察叶片数及... Five key technical measures to improve yield and quality of hybrid rice seed production (c) (2) Flowering prediction and regulation and control: In order to avoid abnormalities caused by parental discharge male parent silkworm uncoordinated, should be flowering in the reproductive process in order to Use the appropriate measures to adjust. ① prediction method: leaf age difference observation method: 6 leaves before the representative representative of the plots in the plots of fixed-point direct observation of the number of leaves and ...