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玉米单交制种是一对自交系杂交的过程。玉米自交系由于其本身的特殊性,单株生产力较低,除充分发挥单株潜力外,提高种植密度是玉米制种取得高产的重要途径。然而密度太大势必因郁蔽过甚而减产。目前,玉米制种的最大密度每亩5000株左右,叶面积指数在4以内,制种产量很少超过300公斤。但玉米健壮素——一种植株矮化剂的施用,使玉米制种在密度和产量上有了突破。去年我们1亩丹王13制种田施用健壮素后,获得亩产410公斤的好收成。其主要措施是:
Single crossbreeding of corn is a process of inbreeding of inbred lines. Due to its own particularity, maize inbred lines have lower productivity per plant. In addition to giving full play to the potential of individual plants, increasing planting density is an important way to achieve high yield of maize seeds. However, too much density is bound to even reduce production due to darkness. At present, the maximum density of seed production of corn about 5000 per acre, leaf area index within 4, seed production rarely exceed 300 kg. However, the application of cornstarch, a plant dwarfing agent, has led to a breakthrough in density and yield in seed production. Last year, our 1 hectar Dan Wang 13 system of farming after the application of Jian Su, access to a good yield of 410 kg per mu. The main measures are: