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随着“九二○”施用技术的完善,水稻不育系穗子全部抽出,异交结实率的提高,过去一套田间辨认杂株的标准已不适应中高产水平。为了稳定和提高种子纯度,我区在实践中摸索出一套新的辨杂除杂方法。即把除杂工作分为四个阶段,根据各个阶段杂株的不同特征进行除杂。第一阶段:播种至孕穗期间。主要除去明显的异品种、稗草等。第二阶段:抽穗期间。主要除去异品种,如杂交一代种、常规种,保持系杂株。其特征是:植株高大,叶片宽长;保持系杂株比母本群体早抽穗1～3天,而且穗颈较长。第三阶段:授粉期间。主要除去保持系杂株。“九二○”施用后,大多数不育系穗子完全抽出,根据穗颈长短已无法区分杂株,其唯一特征是:花药黄色,有正常花粉。每天分早,
With the improvement of application technologies of “920”, the ear of male sterility of rice was fully extracted and the rate of outcrossing and seed setting was increased. In the past, a set of standard for identifying heterosis in the field was no longer suitable for middle-high yield. In order to stabilize and improve the purity of seeds, our district has found out a new set of methods for removing impurities in practice. That is, the work of impurity removal is divided into four stages, according to the various characteristics of different stages of impurity removal. The first stage: sowing to booting period. Mainly remove the obvious different varieties, barnyard grass and so on. The second stage: heading period. Mainly remove the different varieties, such as hybrid generation, conventional species, maintaining the Department of hybrid strains. The utility model is characterized in that the plants are tall and the leaves are wide and long; the maintainer lines are earlier heading for 1-3 days than the female population, and the ear-neck is longer. The third stage: during pollination. Mainly remove the maintenance of hybrid strains. “920 ” application, the majority of male sterile ear completely out, according to the length of the neck has been unable to distinguish between hybrids, its unique features are: anthers yellow, with normal pollen. Every morning,