Introduction to the Spring Potato No. 4 potato variety and its cultivation key points

Breeding institution: Jilin Provincial Institute of Vegetables and Flowers.

Approval status: approved by the Jilin Provincial Crop Variety Approval Committee in 1993, and by the National Crop Variety Approval Committee in 1997.

Variety registration number: GS05002-1997.

Variety source: Wensheng No. 4 X Kexin No. 2

Characteristics: the plant is upright and luxuriant, with a plant height of about 90 cm, thick stems, dark green leaves, and purple flowers; it has strong growth vigor, sets many tubers in a concentrated manner, and the tubers are oblate with white skin and white flesh, and the potato skin has a netted pattern; tuber formation is early, the shape is oblate, the eye depth is medium, the dry matter content is 24.5%, the starch content is 15.9%, the reducing sugar content is 0.46%, the crude protein content is 1.63%, and the vitamin C content is 15.9 mg/100 g. The growth period is about 135 days, and it is a late-maturing variety with good storability, good eating quality, and excellent quality; the tuber flesh has a strong resistance to browning and is suitable for quick-frozen food processing. It is highly resistant to late blight in the field, shows hypersensitivity resistance to PVY, and is tolerant to PSTV. The general yield is 2000-2500 kg of fresh tubers per mu.

Cultivation key points: adopt the high-fertilizer and sparse-planting method, apply more than 3000 kg of organic fertilizer per mu and about 17 kg of diammonium phosphate, keep 3500 plants per mu, and a planting spacing of 70 cm X 30 cm or 60 cm X 35 cm may be used.