铁粳4号是以7636为母本，川籼22号做父本，经系谱法选育而成的高抗恶苗病、稻瘟病、耐寒、耐旱、耐盐碱的高产优质水稻新品种。1992年经辽宁省农作物品种审定委员会审定并命名，评为国内先进水平。至1995年在辽宁省中部平原地区累计种植400多万亩，平均亩产600kg左右，比同熟期 Tiejing 4 is a high-yielding and high-quality new rice variety with 7636 as the female parent and Sichuan indica rice No. 22 as the male parent, which was bred by pedigree method and was highly resistant to diarrheal disease, rice blast, cold hardiness, drought tolerance and salt tolerance . In 1992 by the Liaoning Provincial Crop Variety Approval Committee and named, named the advanced level. By 1995, more than 4 million mu of land had been planted in the plains of central Liaoning Province, with an average yield of about 600 kg per mu,