How is the potato variety Zhengshu No. 4?

Variety source: In 1978, the Zhengzhou Vegetable Research Institute of Henan Province used "Gaoyuan No. 7" as the female parent and "Vera" as the male parent for hybridization, and began promoting it.

Main traits: plant type spreading, plant height about 60cm, stem green, relatively strong growth vigor; leaves green, medium-many hairs, large compound leaves, 4-5 pairs of lateral leaflets: inflorescence peduncle green with a slight purplish tint, pedicel articulation colored, stamens orange-yellow, stigma 2-lobed, weak natural fruiting ability; berries green, medium-sized, with seeds; tubers round, top concave, yellow skin and yellow flesh, skin relatively rough, tubers large and uniform, tuber set concentrated; semi-light sprout base round, light purple, tip pointed, pale purple, many hairs; tuber dormancy period short, medium storability. Medium-early maturing, growth period about 75 days; excellent boiling quality; processing quality: dry matter 18.3%, starch 13%, reducing sugar 0.1%, crude protein 1.56%, vitamin C 12.7mg/100g; relatively resistant to late blight and ring rot, susceptible to scab, lightly susceptible to mosaic virus disease and leafroll virus disease, medium flood tolerance; general yield per 667 sq m is about 1700kg, high yield can reach more than 3000kg.

Suitable planting areas: suitable for cultivation in double-cropping regions; mainly distributed in Zhengzhou City and Xuchang City and other areas of Henan Province, and also cultivated in Shandong, Anhui and other provinces.

Key cultivation techniques: For this variety, the planting density is generally 4000 plants per 667 sq m; strengthen early-stage management, pre-sprouting large sprouts before sowing and plastic film mulching can promote increased yield; avoid applying too much nitrogen fertilizer in the later stage, so as not to cause excessive vegetative growth of branches and leaves and affect yield.