A New Potato Variety-Tongshu 20

Characteristics: the plant type is erect, the plant height is 70-95 cm, the stem is stout, the branch is many, the average main stem per plant is 2.3. The leaves are dark green with luxuriant branches. Corolla white, natural and medium. The tuber is round, the yellow skin is yellow, the potato skin is smooth, the bud eye is medium depth, the tuber is concentrated, the tuber size is medium, the uniformity is high, and the average tuber per plant is 4.7. It is a mid-and late-maturing variety, which is about 110 days from emergence to maturity. The growth potential is strong and the tuber expands rapidly, but the hollow phenomenon is easy to appear in the case of rainfall or uneven irrigation during the expansion period. Drought and barren resistance, salt and alkali tolerance, strong resistance to virus disease, late blight, ring rot and black shank. The content of dry matter is 24.0%, the content of starch is 16.7%, the content of crude protein, reducing sugar and vitamin C is high, and the taste is good. It is suitable for fresh potato consumption, fresh potato export and starch processing. It can be planted in most of the one-season planting areas in North, Northwest and Northeast China.

Key points of cultivation techniques: it is appropriate to sow seeds in the first and middle of May and harvest from late September to early October. Before sowing, 3500-4000 plants per mu were planted. When applying sufficient base fertilizer, it is best to concentrate on nest application, combined with a certain amount of phosphorus and potassium fertilizer, mainly promoting in the early stage and topdressing at the right time. Pay attention to uniform irrigation during the expansion period to avoid and reduce hollowness. Soil cultivation in deep and middle tillage, promotion of lower control in tuber formation stage, combination of promotion and control, shallow and middle tillage, high soil cultivation, promoting tuber expansion and maturity.