遵照毛主席“人类总得不断地总结经验,有所发现,有所发明,有所创造,有所前进”的伟大教导,为尽快地选育出早熟、抗病、丰产、质优、适应性强、制种简单的新杂交品种,以适应备战、备荒,进一步发展玉米生产的需要。从东北、西北、华北等地引入23个优良杂交种,以“双交156”作对照进行比较试验,经观察比较,特别是贫下中农多 According to Chairman Mao’s great guideline that “mankind always has to sum up experiences, discoveries made, inventions made, and advances made”, we should breed as early as possible a precocious, disease-resistant, high yield, high quality and adaptable , The production of simple new hybrid varieties, to adapt to prepare for the shortage, further development of corn production needs. Twenty-three excellent hybrids were introduced from the northeast, northwest and north of China. The comparative experiments were conducted with “Double-crosses 156” as the control. After comparison and observation,