Detailed Introduction to the Ningshu No. 8 Potato Variety

Basic Information Ningshu No. 8 was developed by the Xiji County Seed Company of Ningxia from a variant single plant discovered in 1986 in the local farmer variety "Shenyanwo", through 5 years of systematic selection and breeding from 1987 to 1991. In 1992-1993, a variety comparison trial was conducted for 2 years in Baiya Township, Xiji County, with fresh potato yields of 40002kg/hm2 and 42003kg/hm2 respectively, ranking 1st in yield among the 10 tested varieties, increasing yield by 20.5% and 27.5% compared with the control. In 1994-1995, it participated in the Ningxia new potato variety regional trial for 2 years, with fresh potato yields of 24154.5kg/hm2 and 28045.5kg/hm2 respectively, both ranking 1st in yield among the tested varieties, increasing yield by 23.3% and 21.5% compared with the control. In 1996, it participated in the Ningxia new potato variety production trial, with a fresh potato yield of 30099kg/hm2, increasing yield by 24.1% compared with the control.

Since 1994, various counties in our region and relevant provinces and regions have successively introduced and trial-planted it, and the area expanded rapidly. Before approval, the planting area had reached 350,000 mu in 1997. By 2000, the annual planting area in this region reached 58,780 sq m, accounting for 51% of the region's total potato sowing area, basically achieving one variety renewal. The planting area in other provinces and regions also reached 39,400 hm2, with a cumulative planting area of 187,000 hm2, a cumulative increase in fresh potato production of 855,765,528 kg, and newly added output value of 284 million yuan. In the same year, this achievement won the second prize of the Ningxia Science and Technology Progress Award. In 2001, the planting area in our region further expanded.

Characteristics The plant has strong growth vigor, an upright plant type, a plant height of 6Om, and luxuriant growth. The stems are thick and strong, with 2-4 branches on the main stem. The leaves of the mature plant are light green with relatively many hairs, the compound leaves are medium-sized, and the terminal leaflets are ovate. Each plant sets 3-5 tubers, with an average tuber weight per plant of 0.556kg. Tuber set is concentrated, and the tubers are large and uniform. The tubers are oblong, with white skin and flesh, and relatively deep eyes. The tuber dry matter content is 21.29%, crude starch 18.97%, protein 2.01%, and Vc 15.03mg/100g. The growth period is about 110d. It is resistant to mosaic virus, leafroll virus, ring rot, blackleg, and late blight. It is drought-resistant and storage-tolerant.

High yield: In large-area planting, the fresh potato yield per hectare is generally above 24000kg, increasing yield by more than 20% compared with the control. High starch content: The starch content of fresh potatoes is 18.97%, more than 2.77 percentage points higher than the varieties originally planted in production. Good processing quality: According to processing research by the Xiji County Starch General Company, this variety is the only one planted on a large scale in our region that can be used to process synthetic flour (whole flour). The starch viscosity is increased by 20%-30% compared with the original variety, and the whiteness is higher than 90%, which can save the pigment extraction process, with very significant economic benefits. Wide adaptability: It is not only suitable for large-scale planting in Ningxia, but also performs outstandingly when introduced and planted in Dingxi and Pingliang in Gansu, northern Shaanxi, and western Inner Mongolia, where the area has also expanded rapidly.

Breeder: Xiji County Seed Company of Ningxia

Region and Techniques a. Use cut seed pieces from young and healthy tubers or plant small whole tubers. In arid areas, sow in late April at a planting density of 45000 hills/hm2. In semi-arid areas, sow in mid-April at a planting density of 52500 plants/hm2. b. Apply 45000kg of high-quality farmyard manure and 150kg of diammonium phosphate per hectare as a base fertilizer, and topdress 75kg of urea at the budding stage. c. Cultivate and weed frequently according to actual conditions. d. After flowering, earth up and ridge in time, and pull out weeds and inferior plants. e. Control rodent damage in time.