近几年,我国北方缺水地区正大力推广水稻早种技术,这是节省用水扩大稻作面积,提高粮食产量,增加农民经济收入和增加细粮,改变人民食物构成的一项有效途径。我国北方地区目前推广的春播水稻旱种,其主要技术是:春季用水稻品种旱直播,并让苗期旱长,苗期以后开始灌水,使土壤保持湿润状态,或保持水层。水稻早种实质是一 In recent years, water-scarce areas in northern China are vigorously promoting early rice technology, which is an effective way to save water and expand rice area, increase grain output, increase farmers’ economic income and increase fine grain, and change people’s food composition. The main technology of spring sowing paddy rice in northern China is that it is dry sowed with rice varieties in spring and dries long in seedling stage and then begins to irrigate water to keep the soil in a moist state or keep the water layer. The essence of early rice is one