Abstract:

Longzi No.12 is a new purple sweet potato variety with Vietnam purple sweetpotato as free pollination female parent by Longyan Agricultural Research Institute. The purple potato is spindle-shaped, the peel is dark purple, and the flesh is dark purple. The number of sweet potatoes per plant was 4.60, the dry matter rate of fresh tubers was 36.26%, the starch rate in district test was 25.18%, the soluble sugar content was 3.42%, and the anthocyanin content was 519.00 mg·kg^-1. The dry sample contained 7.13% protein, 5.50% sucrose, 5.70% reducing sugar and 2.50% dietary fiber, which had a good taste and a smooth and beautiful appearance. Longzi No.12 is resistant to vine cut, black spot and root rot. The yield of fresh potatoes was 2 173.21 kg, dried potatoes and starch yields were 786.55 kg and 566.48 kg per 667 m² yespectively in district test in Fujian Province, which were 10.96%, 36.63% and 44.66% higher than those of Funingzi No.3, respectively. It is suitable for summer and autumn planting in Fujian, Jiangxi, Guizhou, Sichuan, Guangxi and other places. In 2022, it passed the national registration of non-major crop varieties.

Key words: sweet potato, Longzi No.12, breeding, cultivation techniques