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播种前的种子处理主要包括选种、晒种、浸种及药剂拌种,其作用是提高种子的发芽率、增强发芽势及预防病虫害。1.选种、晒种。选种主要有风选、水选和筛选等几种方法。玉米、大豆等大粒种子,最好用手选的方法,以便淘汰秕瘦粒、破损粒、虫咬粒、霉变粒,选出粒大饱满、均匀一致的种子。将选好的种子摊在水泥晒场或席子上,在阳光下曝晒,不仅可以杀菌灭卵,减轻病害,而且有促进种子生理成熟,增强发芽势,提高发芽率的作用。晒种3天,发芽率一般可提高5～10％,早出苗1～2天。晒种时要翻动数次,使种子均匀受热。
Seeds before sowing include seed selection, sunning, seed soaking and seed dressing. Its role is to increase seed germination rate, increase germination potential and prevent pests and diseases. 1. Selection, sun kinds. Selection of the main wind election, water selection and screening, and several other methods. Corn, soybeans and other large seeds, it is best to use hand-selected method, in order to eliminate leprosy grain, damaged grain, insect bite grain, mildew grain, selected grain full, uniform seeds. The selected seeds in the cement drying yard or mat, in the sun exposure, not only sterilization eggs, reduce disease, but also to promote seed physiological maturity, enhance germination potential and improve the role of germination rate. Suning 3 days, the germination rate can generally increase 5 ~ 10%, early emergence of 1 to 2 days. Sow seed when you want to turn several times, so that the seeds are evenly heated.