Potato Zhengshu 4

Variety source: Henan Zhengzhou vegetable Research Institute used "Gaoyuan 7" as female parent and "vera" as male parent in 1978, and began to popularize.

Main characters: plant type development, plant height about 60cm, stem green, growth potential strong; leaves green, velutinous, compound leaves large, lateral leaflets 4: 5 pairs: inflorescence peduncle green with light purple peduncle colored, stamens orange, stigma 2-lobed, natural fruiting weak; berries green, medium size, seeded; tubers round, apical shape, yellow flesh, rough epidermis, tubers large and neat, tubers concentrated The base of semi-light bud is round and light purple, and the top is pointed and lavender with many pilose hairs. The dormancy period of tuber is short and the storability is medium. Mid-early maturity, about 75 days of growth days; excellent steaming quality; processing quality: 18.3% of dry matter, 13% of starch, 0.1% of reducing sugar, 1.56% of crude protein, vitamin C 12.7 mg/100g; is more resistant to late blight and ring rot, scab, light mosaic virus and leaf roll virus, moderate waterlogging resistance; generally 667 square meters of output is about 1700kg, high yield can reach more than 3000kg.

Suitable for planting areas: suitable for two-season cultivation; mainly distributed in Zhengzhou and Xuchang City, Henan Province, Shandong, Anhui and other provinces also have cultivation.

Key points of cultivation techniques: the planting density of this variety is generally 667 square meters with 4000 plants; strengthening the early management, promoting bud and plastic film mulching before sowing can promote the increase of yield; excessive application of nitrogen fertilizer is avoided in the later stage, so as not to cause excessive growth of branches and leaves and affect the yield.