要想获到杂交水稻制种高产量,首先应确保花期相遇良好。在适当的播错期基础上,进行花期预测调节是十分重要的。以往的花期预测,都是在幼穗分化后经解剖镜检或剥查来判断,往往因距抽穗期短,回旋余地少,容易形成调节过迟,影响花期的相遇。我们在长期的制种过程中,应用下述方法,提早在幼穗分化前进行花期预测和调节,避免花期不遇的现象出现。 1.花期预测的方法①直观法。根据多年的制种资料,按组合划分,编制某时段内的父母本相对应的叶龄变动表。预测时,与田间该阶段的实际调查数值进行比较, To get high yield of hybrid rice seed, first of all should ensure that the flowering meet well. Based on the proper broadcast period, it is very important to adjust the flowering period. In the past, the flowering prediction was judged by dissection microscopy or flaking after panicle differentiation. It is often due to short heading time and less room for maneuver, which makes it easy to form a late adjustment and affect the flowering encounter. In the course of long-term seed production, we apply the following methods to forecast and regulate flowering periods ahead of spike differentiation in order to avoid the occurrence of inflorescences. 1 flowering method ① intuitive method. According to many years of seed production information, according to the combination of division, preparation of a certain period of time corresponding to the parents of leaf age change table. When forecasting, compared with the actual survey value in this stage in the field,