在毛主席的革命路线指引下,北京地区农田基本建设迅速发展,肥水条件日益改善,复种指数不断提高,迫切要求晚播早熟、秆矮抗倒的冬小麦良种,以利间、套、复种,争取上下茬齐高产。我们在前一阶段工作中初步注意了这个生产动向。1962年用早熟、秆较矮的5707[(华北187×石特14)F_1×早熟工号1]的选系和中早熟的5709[(早洋×碧蚂4 Under the guidance of Chairman Mao’s revolutionary line, capital construction in Beijing has seen rapid development in farmland construction. Conditions for fertilizer and water are improving day by day, and the index for multiple cropping is constantly increasing. Eager to plant early-maturing and stubble resistant winter wheat seedlings, Stubble crop along the high yield. We initially paid attention to this production trend in the previous stage of work. In 1962, the precocious, shorter stalk 5707 [(North China 187 × Shite 14) F_1 × early maturing No. 1] selection and early maturity of 5709 [(early ocean × Bi Ma 4