二年来,随着杂交水稻的全面推开,四优二号已成为全区的当家品种.为了认识和掌握四优二号的特性、高产规律和相应的栽培技术,我们从一九七七年起在本所试验农场(沙县柱元,海拔123米)进行分期播种试验.以期探明在早晚季不同气温条件下,四优二号的苗株穗、穗粒重、个群体发展过程的生育特性,充分发挥其增产潜力.为制定栽培技术提供依据. In the past two years, with the full introduction of hybrid rice, Siyou No. 2 has become the country’s leading variety.In order to understand and grasp the characteristics of Siyou No. 2, the law of high yield and the corresponding cultivation techniques, we from 1977 The trial sowing experiment was conducted on the experimental farm (Shaxianzhuangyuan, 123 meters above sea level) in order to find out the spikelet weight, spike weight per plant and the fertility of the population during the development of population Characteristics, give full play to its potential yield. To provide the basis for the development of cultivation techniques.