大洼县:1978年杂交稻制种田,为了保证母本穗数和增加授粉机会,插秧方式以8×3寸为主,占全县制种面积的70％;其次是9×3寸;有少部分是10×3寸。这三种形式相比,在行比相同的情况下,行距每缩小1寸。则可增加利用面积10％以上,实际上增加了母本株数。据荣兴农场试验:父母本同样是1:3行比,8×3寸比9×3寸每亩母本穗数增加20,000穗,产量增加16.2％,而8×3寸比10×3寸,每亩母本穗数增加38,000穗,增产33.1％。但也不是越密越好,如7×3寸比8×3寸穗数反而有所下降,产量也有所减少。 Dawa County: In 1978, hybrid rice farming, in order to ensure that the female parent spike and increase the chance of pollination, transplanting methods to 8 × 3 inch, accounting for 70% of the county seed area; followed by 9 × 3 inch; A small part is 10 × 3 inches. Compared to these three forms, the row spacing is reduced by 1 inch for each line under the same condition. You can increase the use of more than 10%, in fact, increased the number of female parent. According to Rongxing Farm test, the parents also increased the number of spikes by 1: 3 and 20,000 spikes per 8-by-3-inch-9 × 3-inch per mu parent, yielding an increase of 16.2%, while that of 8 × 3-inches was 10 × 3 inches , The number of spikes per female parent increased by 38,000 spike, an increase of 33.1%. But it is not as dense as possible. For example, the number of spikes of 7 × 3 inches is smaller than the number of spikes of 8 × 3 inches, and the output also decreases.