为了减少远距离引种的盲目性,增强预见性,引种时需要注意以下几个问题。1 要注意种子原产地区与本地区之间生态环境的差异,特别是气候因素的差异玉米是短日照作物,由北向南引种,可以提早成熟,株高、穗位较低,玉米果穗、子粒变小。由南向北引种,生育期延长,植株、穗 In order to reduce the blindness of the introduction of long-distance, enhance predictability, the introduction of the need to pay attention to the following questions. 1 should pay attention to the ecological environment of the seed origin area and the region differences, especially the differences in climatic factors Corn is a short-day crop, introduced from north to south, can be premature, plant height, ears lower, corn ear, grain Smaller Introduced from south to north, extending the growing period, plants, spikes