Abstract: Yujiao No.4, a new cultivar of wild rice (Zizania latifolia Turcz.), developed from the indigenous mutation wild rice lines of Zhejiao No.2. Yujiao No.4 with a strong plant type had a similar tillering capacity with Zhejiao No. 2. The gross weight and net weight of fleshy stem (24.0 cm in length, 4.0 cm in diameter) in autumn cropping were 163.8, 113.0 g. The yield in autum cropping was 1 194.7 kg·667m-2, increased by 42.14% compared to Zhejiao No.2 and the harvest time of autumn cropping was from November 4th to December 9th, delayed 22 d compared to Zhejiao No.2. The gross and net weight of fleshy stem (165 cm in length, 35 cm in diameter) in summer cropping were 120.3 and 73.7 g, respectively, the yield in summer cropping was up to 3 093.0 kg·667m-2,20.40% more than Zhejiao No.2, while the harvest time of summer cropping was similar with Zhejiao No.2. Fleshy stem of Yujiao No.4 with big size and high level nutrient may gain a good reputation in commercial market.

Key words: Zizania latifolia, double cropping, breeding, Yujiao No.4, characteristics