1初级产比试验方法改进背景20世纪80年代以来,玉米单交种已广泛地被全世界及我国生产所利用。一个品种的育成要经过初级产比试验、中高级产比试验、区域试验、生产试验、品种审定。在这些过程中初级产比试验是非常关键的一步,而初级产比试验方法的优劣直接影响试验的成败。因此 1 Primary production ratio test method to improve the background Since the 1980s, single corn cross has been widely used by the world and our production. A variety of bred to go through the primary production ratio test, the ratio of high-grade production test, regional test, production test, variety validation. In these processes, primary production ratio test is a very crucial step, and the primary production ratio test method directly affects the success or failure of the test. therefore