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恩单2号、黔单1号和黔单2号,都是经过全国区试、全省多点试验比新单1号或地方良种增产30％以上。今年开始示范推广。推广玉米杂交种最重要的就是解决繁殖制种问题。玉米的繁殖制种要解决的问题很多,这里只从种植技术方面谈一下应注意的事项。 (一)建立隔离区:隔离区的目的,就是避免要繁殖的玉米自交系或配制的杂交种与其它玉米发生混杂(串粉),因此繁殖地或制种地最好选用周围500米内无其它玉米的地段。也可因地制宜地利用屏障(如房屋、山岗、林园等)和错开播种期(30天以上)的办法,达到隔离的目的。
En No. 2, Qian No. 1 and Qian No. 2, all through the national district test, the province more than the number of new single test No. 1 or local varieties of more than 30% increase. This year began demonstration and promotion. The most important thing to promote corn hybrids is to solve the problem of seed production. Maize breeding to plant a lot of problems, here only from the aspects of planting techniques should pay attention to matters to be noticed. (A) the establishment of the quarantine zone: The purpose of the quarantine zone is to avoid breeding corn inbred lines or hybrids prepared with other corn mixed (string meal), so breeding or seed production is best to use within 500 meters around Other corn lots. Can also be used according to local conditions, such as barriers (such as houses, hills, forests, etc.) and stagger sowing period (more than 30 days) approach to achieve the purpose of isolation.