1.选地隔离玉米是异花授粉作物,极易串花。因此,安全隔离在玉米制种过程中显得特别重要。隔离的方法有多种,各地要因地制宜,合理选用。既可以利用村庄、河流、土丘、树林等天然屏障阻止外来花粉,又可以采用错开距离的空间隔离,其空间距离不得少于300米;应用时间隔离也较为方便,即在春玉米区安排夏播制种或在夏玉米区进行春播制种,其错开时间应保证在30～35天之间,在上述条件都不具备的情况下也可以在制种区周围种植40～50行高粱等高秆作物阻挡外来花粉,达 1. Selection of isolated corn is cross-pollinated crops, easy to string flowers. Therefore, safety isolation is particularly important in seed production. There are a variety of ways to isolate, depending on local conditions, a reasonable choice. Can use the villages, rivers, mounds, woods and other natural barriers to prevent foreign pollen, but also can be used to space away from the space, the spatial distance of not less than 300 meters; the application of time isolation is also more convenient, that summer arrangements in the summer corn Sowing seeds or spring sowing in the summer maize area, the staggered time should be guaranteed between 30 to 35 days, in the case of the above conditions are not available in the planting area can also be planted 40 to 50 lines sorghum contour Stalk crops block foreign pollen, up to