How is the new potato variety Tongshu 20?

Characteristics: Plant type upright, plant height 70-95 cm, stems thick and strong, many branches, average 2.3 main stems per plant. Leaf color dark green, branches and leaves luxuriant. Corolla white, natural fruit set moderate. Tubers round, yellow skin and yellow flesh, tuber skin smooth, eye depth medium, tuber set concentrated, tuber size medium, high uniformity, average 4.7 tubers per plant. It is a mid-late maturing variety, about 110 days from emergence to maturity. Growth vigor strong, tubers expand quickly, but if rainfall or irrigation is uneven during the expansion period, hollow heart is likely to occur. Drought tolerant and tolerant of poor soil, tolerant of saline-alkali soil, with strong resistance to viral diseases and late blight, and resistance to ring rot and blackleg. Dry matter content 24.0%, starch content 16.7%, high contents of crude protein, reducing sugar and vitamin C, good eating quality and taste, suitable for fresh tuber consumption, fresh tuber export and starch processing. It can be planted in most single-cropping areas of North China, Northwest China and Northeast China.

Key cultivation techniques: In single-cropping areas, sowing in early to mid-May is appropriate, and harvest from late September to early October. Chit before sowing, plant 3500-4000 plants per mu. Apply sufficient base fertilizer, preferably concentrated in hills, together with a certain amount of phosphorus and potassium fertilizer; in the early stage, focus on promoting growth, and topdress in good time. Pay attention to uniform irrigation during the expansion period to avoid and reduce hollow heart. Deep intertillage and hilling in stages; during tuber formation, promote underground growth and control aboveground growth, combining promotion and control, shallow intertillage, high hilling, to promote tuber expansion and maturity.