近几年,杂交水稻推广速度较快。在南方双季稻区,生产上遇到的一个问题是早、晚稻争季节的矛盾十分突出。由于目前一般早稻中、迟熟品种占的比重较大,而推广的杂交双季晚稻又是以汕优6号、2号和威优6号等迟熟组合为主。早、晚稻“两熟”当家,使杂交双季晚稻插秧期受早稻成熟期的限制而不能早栽,安全齐穗期常常受到“寒露风”的影响制约,导致杂交双季晚稻产量低而不稳。为了改变这种状况,各地采取了调整早稻品种布局,选用杂交双季晚稻早熟、高产组合,改进栽培管理 In recent years, the promotion of hybrid rice faster. In the southern double cropping area, one of the problems encountered in production is the contradiction between the early and late rice intensifying seasons. Due to the current general early rice, late-maturing varieties account for a larger proportion of the promotion of hybrid double-season late rice is Shanyou 6, 2 and Weiyou 6, such as the combination of late-based. Early and late rice “two ripe” when the home, so that the hybrid double season late rice transplanting period is limited by the maturity of early rice can not be early planting, safe heading date is often affected by the “cold dew wind” impact, resulting in hybrid double late rice yield is low and not stable. In order to change this situation, various localities have taken measures to adjust the layout of early rice varieties, choose early maturing and high-yielding hybrid double late rice varieties, and improve cultivation management