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选育优良自交系,利用杂种优势配制高产稳产杂交种,是玉米育种工作的重要途径和手段。新疆目前生产上应用的两个主要玉米双交种,种性退化,优势不高;近年来北疆部分地区试种的中单2号玉米单交种,虽丰产性高,但偏晚熟,难于稳产,且制种时两亲本生育期差异较大,花期不协调,难于扩大推广。选育生育期适中、生态型较好的高产稳产玉米杂交种,为新疆当前玉米生产所急需。我们于1977年组配的1702杂交组合,在多年的比较试验和大面积生产示范中,均表现出较高的杂种优势,适应性强,是一个比较高产稳产的杂交种。
Breeding elite inbred lines, the use of heterosis in the production of high yield stable hybrids, maize breeding is an important way and means. In Xinjiang, the two major maize double crosses currently used in production are degenerated, with low advantages. In recent years, Zhongdan No.2 maize single-seed cultivars planted in some parts of northern Xinjiang have high yield but low late ripeness, Stable production, and seed production of the parents of the larger differences during the growing season, flowering is not coordinated, it is difficult to expand promotion. Breeding of moderate growth period, good ecological type of high and stable yield of maize hybrids, Xinjiang is currently in urgent need of maize production. The 1702 hybrid combination we assembled in 1977 showed high heterosis in many years of comparative experiments and large-scale production demonstration. It is a high-yielding hybrid with high adaptability.