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1 不同生态类型不同生态类型地区异地制种,容易成功,一般在异地只须按原地制种技术指导既可,但在不同生态类型地区制种应考虑如下原则,因情况进行估测调整。1.1 生育期和积温玉米在整个生育过程或阶段发育过程中,体现一定的积温效应和生育日数,一般因品种类型不同,所需积温和生育期也不同。在进行异地制种时,首先要考虑该地区的无霜期和≥10℃的有效积温是多少。积温不足,无霜期短,制种不能成熟;积温太高,无霜期
1 Different ecotypes of ecotypes of different ecotypes can be successfully grown in different places. Generally, they can only be produced according to the technique of in-situ seed production. However, seed production in different ecotypes should consider the following principles and be adjusted according to the situation. 1.1 Growth and accumulated temperature Corn in the whole reproductive process or stages of development, to reflect the effect of certain accumulated temperature and the number of days of birth, generally due to different types of species, the required temperature and growth period are also different. In the field of seed production, we must first consider the region’s frost-free period and ≥ 10 ℃ effective accumulated temperature is what. Insufficient accumulated temperature, frost-free period is short, seed production can not mature; accumulated temperature is too high, frost-free period