为了探明播栽期和播种量对早籼二九丰生育规律和产量的影响。根据作物各器官生长发育的相关性,在不同的播栽期、播种量和群体结构条件下,研究它的主茎各叶与其同伸器官的关系和根据主茎叶龄期判断其它器官的生长发育进程,从而对早籼二九丰进行人为的促控,达到稳产高产。 In order to explore the sowing date and seeding rate of early indica Eupatorium fertility law and yield. According to the correlation of the growth and development of various organs of the crop, the relationship between the leaves of its main stem and its islets and the growth of other organs were determined according to the age of main stems under different sowing dates, seeding rates and population structure. Development process, so as to early indica ErJiuFeng artificial promotion and control, to achieve stable and high yield.