达四是我所中梁试验站从罗马尼亚品种达西亚中系统选育而成。经1973—1981年八年试验表明,达四是一强冬性、中熟、抗逆力强、高产稳产、适于渭河及西汉水上游高山地区种植的山区优良新品种。1981年6月经地区科研成果鉴定,12月报省农作物品种审定委员会批准推广。 Fourthly, my Zhongliang pilot station was systematically bred from the Romanian variety Dacia. After eight years of experiment from 1973 to 1981, it was proved that up to the fourth grade was a strong winter, medium maturity, strong resistance to stress and high and stable yield. It was suitable for the fine new varieties of mountainous area planted in the upper reaches of the Weihe and Western Han rivers. June 1981 by the regional scientific research appraisal, December reported to the Provincial Crop Variety Approval Committee approved the promotion.