种子是重要的生产资料,农业要实现“两高一优”,保证种子质量。提高种子生活力,尤为重要。因此,在我国北方,玉米种子应避免冻害,及时收获与晾晒。 玉米种子在蜡熟后期,子粒饱满,苞皮松散时,应立即收获,以避开霜冻。收割时应放排晾晒或簇起来晾晒3～5天,这样,不仅能增加种子养分,提高千粒重,促进早熟。还能使发芽率达到90％以上。如果天气过于寒冷,收获太晚,站秧就会冻坏胚芽,降低种子生活力,如果达不到国家规定的85％以上发 Seeds are an important means of production, and agriculture must achieve “two highs and one superior” to ensure the quality of the seeds. It is especially important to improve seed vitality. Therefore, in the north of our country, corn seeds should be avoided frost damage, timely harvest and drying. Corn seeds mature in the late wax, grain full, bract loose, should be harvested immediately to avoid frost. When harvesting should be placed drying or tufted 3 to 5 days, so that not only can increase the seed nutrients, improve 1000-grain weight, and promote premature. But also to germination rate of 90% or more. If the weather is too cold, harvest too late, station seedlings will freeze the germ, reducing seed viability, if less than 85% of the national hair