Taking the population calculated from the basic seedlings formulas self - drafted of the dry - land seedling - raised on plastic trays ( dpt ) with scattered - planting in double - season rice as the middling population , one population of the higher and the lower were set respectively , and the yields and yield formations of these different basic populations were compared 摘要以自拟基本苗公式计算出的苗数为中等群体，设置上下水平基本苗数各1个为对照，比较了早、晚稻塑盘早育抛栽不同群体起点产量及其形成的差异。
