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用雄性不育系陕2A与春性双低品种040杂交，连续回交5代，获得了不育性状稳定的不育系040A及保持系040B。用垦C1与双低品系S83－1603杂交，连续自交5代，并与不育系测交筛选出低并酸恢复系NK3。不育系040A与恢复系NK3配制的强化组合NKU－4具有丰产稳产、耐菌核病、低芥酸等特性，1991～1995年多点试验、示范结果，其平均产量2571km／hm2，平均比对照品种增产31．3％。
The male sterile line Shaan 2A was crossed with the spring double-breed line 040 for 5 generations. The 040A sterile line and 040B maintainer line were obtained. Ken C1 and double low-grade lines S83-1603 were crossed for 5 generations in succession, and the low-acid restorer line NK3 was screened with male sterile lines. NKU-4, a combination of sterile line 040A and restorer line NK3, has the characteristics of high and stable yield, resistant to Sclerotinia sclerotiorum and low erucic acid. From 1991 to 1995, more experiments and demonstration results showed that the average yield of NKU-4 was 2571km / hm2, Control varieties increased by 31.3%.