Abstract: ‘Guoxia 3’is a new non-heading Chinese cabbage F₁ hybrid produced by crossing two self-incompatible inbred lines,17N-724 and 17N-1114. As a summer-autumn cultivar,it exhibits vigorous plant growth,an upright plant type,deep green leaves,large and flat leaf blades,green erect and compact petioles,and a small amount of wax. When harvested 35 days after summer sowing,plants reached a height of 25 cm,a spread of 27 cm,with a petiole width of 4.1 cm and thickness of 0.6 cm. The average single plant weight was 140 g,and the yield was around 52 500 kg · hm^-2. This cultivar exhibits high resistance to black spot and black rot diseases,as well as resistance to soft rot,heat,and rain. With excellent quality,it has been promoted in various provinces and cities including Beijing,Tianjin,Hebei,Shandong,Shanghai,Fujian,and Hunan,with a cumulative promotion area exceeding 100 000 hm².

Key words: non-heading Chinese cabbage, heat-resistant, hybrid, cultivar