辐选“48大麦”系从1970年~(60)Co-γ射线照射“早熟三号”大麦选出“3315”中的优良单株,经1976～79年单株繁殖选育成的二棱皮大麦新品系。1980～81年进行品比试验和大田试种,黄花叶病极轻,比“早熟三号”大麦秆矮,耐肥抗倒,早熟稳产。1981～82年参加市区域试验,并在郊县进行品比和生产试验,试种面积近50亩。试种单位分别以早熟三号、泾大一号、沪麦四号、77—130等为对照,增产的有5个单位,增产幅度3.86～40.58％,平均增产17.64％;3个单位减产,减产幅度 2.95～16.73％,平均减产11.18％。本院农试场选择肥力中等田块, Radiation “48 barley” was selected from “3315” from 1970 ~ (60) Co-γ ray irradiation “precocious three” barley, and was bred and cultured from 1976 to 79 New barley lines. From 1980 to 1981, the ratio test and the field trial were carried out. The yellow mosaic leaf disease was extremely light and shorter than the “Early Maturing No.3” barley straw. From 1981 to 1982 to participate in the city regional test, and in the suburbs counties and production test, test area of ​​nearly 50 acres. Planting units were early maturing three, Jing one, Shanghai wheat on the 4th, 77-130 as the control, an increase of 5 units, an increase of 3.86 ~ 40.58%, an average increase of 17.64%; 3 units to reduce production, Output reduction 2.95 ~ 16.73%, an average reduction of 11.18%. Our hospital farm choose medium fertility field plots,