Introduction to the Characteristics and Traits of the Mianshu No. 4 Sweet Potato Variety

(1) Variety source: A new dual-purpose feed and food variety bred in 1992 by the Mianyang Municipal Academy of Agricultural Sciences, using Xushu 18 as the female parent and Mianfen No. 1 as the male parent.

(2) Characteristics and traits: Medium-maturing, medium-vine type. The top leaves are purple, mature leaves are green, and old leaves turn purplish red; the leaves are heart-shaped with toothed margins; the plant type is prostrate, with 5-8 branches at the base; the storage roots are short spindle-shaped and relatively large; the skin is light yellow and the flesh is light yellow; rooting is concentrated, with 2-3 storage roots per plant; sprouting ability is good, and growth vigor is strong at the seedling stage and in the field. The dry matter rate of the storage roots is 26.5%, the starch yield rate is 13.7%, and the marketable root rate is 92.4%; the vines and leaves are crisp and tender, adaptability is relatively good, and resistance to black spot disease is slightly better than that of Nanshu 88; the eating quality of the cooked product is average. It is a relatively good dual-purpose feed and food variety.

(3) Yield performance: In the 1993 and 1994 provincial regional trials, the average fresh root yield per mu was 2087.65 kg, the vine and leaf yield was 1609.48 kg, the total fresh biological yield was 3789.77 kg, and the total dry biological yield was 744.67 kg, which were 7.76%, 20.15%, 13.11%, and 3.85% higher than those of the control Nanshu 88, respectively; in the 1995 production trial, the average over 6 trial sites was 1553.73 kg of fresh sweet potato per mu, 1204.53 kg of vines and leaves, 2758.26 kg of total fresh biological yield, and 557.72 kg of dry biological yield, which were 16.92%, 35.51%, 24.37%, and 12.93% higher than those of Nanshu 88, respectively.

(4) Suitable planting areas: Suitable for planting on sloping and terraced land in the sweet potato production areas of our province.