近年来,我省湘南等地用杂交中稻作早稻栽培,对提高早稻产量起了很大作用。但是,由于现有的杂交组合生育期较长,一般要7月底 8月初才能成熟,而杂交晚稻又必须在6月中旬前播种,才能确保安全齐穗,这样使晚稻秧龄一般在50天以上,形成了迟栽长秧龄类型。因此,研究杂交晚稻迟栽长秧龄 In recent years, southern Hunan and other places with hybrid rice for early rice cultivation, to improve the yield of early rice played a significant role. However, since the current hybrid combinations have a longer growing period, they generally mature at the end of August and early August, and the hybrid late rice must be planted before mid-June to ensure safety and complete harvesting, so that the late rice seedling age is generally above 50 days, Formed a late-growing long seedling type. Therefore, the study of late hybrid rice late planting long seedling age