Report on national trial for sweet potato varieties for special use in southern China(Guangxi)during 2014-2015

ObjectiveThrough national trial for sweet potato varieties in southern China, the present study aimed to screen superior sweet potato varieties for special use that were suitable for planting in Guangxi and provide reference for variety breeding and promotion. MethodTen sweet potato varieties for special use in national trial were planted in Nan-ning, Guangxi for comparison analysis during 2014-2015. Ningzishu No. 1 was taken as control(CK). Fresh sweet potato yield,dry sweet potato yield, dry matter rate, cooked taste, anthocyanin content and disease resistance of the varieties were analyzed. ResultAmong the ten varieties, fresh sweet potato yield of Yuzi No.7,Guishu 131,Fushu 404, Guangshu 161 and Longjinshu No.1 increased by 12.46%-36.63% compared with CK, the increment reached significant level (P<0.05) and extremely significant level(P<0.01), fresh yield of the rest varieties declined compared with CK. Dry sweet potato yield of Yuzi No.7,Guangshu 161, Guishu 131, Fushu 404, Longjinshu No.1,Zhanzishu No.1 and Longzi No.6 in-creased by 5.30%-54.49%; that of other varieties decreased compared with CK. Dry matter rate of all tested varieties were higher then that of CK. Cooked taste ranged between 65.00-90.00, Yuzi No.7, Guishu 131,Fushu 404,Guangshu 161, Zhanzishu No.1,Longzi No.6,Quanshu 9-6 and Jinshu No.13 scored 71.25-81.25 on average, which was higher than that of CK(70.00). All tested varieties were resistant to at least one major sweet potato disease. According to identification objects for national sweet potato for special use, Longzi No.6 was variety with high anthocyanin content, Yuzi No.7, Guishu 131, Fushu 404 and Guang 161 were food sweet potatoes. ConclusionThe performance of sweet potato variety Longzi No.6 with high anthocyanin content and food sweet potato varieties Yuzi No.7, Guishu 131, Fushu 404 and Guangshu 161 are suit-able for planting in Guangxi.