Introduction to the Characteristics of the Mianshu No. 5 Sweet Potato Variety

(1) Variety source: It was bred by the Mianyang Municipal Institute of Agricultural Sciences through hybridization using Zhezhou 84-64 as the female parent and Mianfen No. 1 as the male parent. The original line number was 89-1524.

(2) Characteristics: The starch extraction rate is 19.01%, the rate of marketable tubers is over 82%, and the drying rate of tubers is 33.6%; its resistance to black spot disease and storage tolerance are superior to Nanshu 88. The cooked food quality is relatively good, and it is a variety used for both processing and feed.

(3) Yield performance: In the two years of provincial regional trials in 19% and 1995, the average fresh tuber yield per mu was 1701.7 kg, a decrease of 11.8% compared with the control Nanshu 88; vine and leaf yield was 1463.2 kg, an increase of 19.95%; dried tuber yield was 524.4 kg, an increase of 4.2%; starch yield was 345.97 kg, an increase of 16.2%; biological fresh yield was 3164.75 kg, an increase of 0.5%; biological dry yield was 750 kg, an increase of 2.5%. In the 1996 production trial at 5 sites, the average fresh tuber yield per mu was 1170.3 kg, a decrease of 8.1%; vine and leaf yield was 1268.3 kg, an increase of 24.8%; dried tuber yield was 406.9 kg, an increase of 9.96%. The starch yield per mu was x4.1 kg, an increase of 24.6%; biological fresh yield was 2438.4 kg, an increase of 6.5%; biological dry yield was 558.9 kg, an increase of 13.7%.

(4) Suitable planting areas: This line should avoid excessive application of nitrogen fertilizer and water and waterlogged land, and is suitable for planting in moderately lean soil plots.