杂交水稻根系发达,活力强,这已为人们所熟知,而杂交水稻旱种更反映出了这一优势。 一、从意外的发现认识杂交稻适于旱种 七十年代初期,北京市农业科技人员开始在北京郊区研究水稻早种,使用的是常规品种,在覆土直播的条件下,基本管理方式是“前旱后水”,但产量不高不稳。 1978年 Hybrid rice developed root system, strong vitality, which is already well known, and hybrid rice dry farming more reflects this advantage. First, from the unexpected discovery of hybrid rice is suitable for dry farming In the early seventies, Beijing’s agricultural scientists began to study the early planting of rice in the suburbs of Beijing, the use of conventional varieties, under the condition of direct seeding, the basic management is “ Before drought water ”, but the output is not high and unstable. 1978