据报道,水稻幼苗含氮量超过2.5%,叶片才能正常伸展,而水稻幼苗二叶期前所需氮素养分的供体——种子胚乳的含氮量往往低于1.68%,不能满足幼苗的生长需要.利用尿素浸种,有肥育和刺激种子内部物质的转化及提高幼苗体内酶的活性等作用,以便早期供氮,促进幼苗生长,提高秧苗素质.同时,水稻冷害是世界水稻生产地区带有普遍性的自然灾害,我省近20年中约半数年份由于早春出现低温和连续阴 It has been reported that when the nitrogen content of rice seedlings exceeds 2.5%, the leaves can normally extend. However, the nitrogen content of seed endosperm, which is the donor of nitrogen nutrients required before the second leaf stage of rice seedlings, is often less than 1.68% Growth needs, the use of urea soaking, fertilizing and stimulating the transformation of seed material and improve the activity of seedlings in vivo enzyme activity in order to early nitrogen supply, promote seedling growth, improve seedling quality.At the same time, rice cold damage is the world rice production area with Universal natural disasters, nearly 20 years in our province about half the year due to early spring low temperature and continuous Yin