1 选好基地选好基地是夺取制种优质高产的前提,基地的选择要考虑以下四个方面1.1 根据制种组合选择基地目前在盐城市境内农场所制的组合绝大多数为两系品种,其制种质量同气候关系极为密切,如在母本育性转换期遇低温危害,将出现母本自交结实,种子纯度得不到保 A good base selection base is to seize the premise of high quality and high seed production, base selection to consider the following four aspects 1.1 According to the seed selection base combination Yancheng in the country the vast majority of the combination of the two series of farms, The quality of its seed production and climate are closely linked, such as low temperature during the fertility of the mother of the crisis, there will be self-bred mother of seed, seed purity can not be guaranteed