Improved Potato Variety-Dongnong 303

Brief introduction of varieties

The source of ① variety. An excellent variety selected by Northeast Agricultural College.

② feature properties. The plant is erect, the stem is stout, the plant height is about 45 cm, the spreading degree is 40 cm × 50 cm, the branch is medium, the leaf is green, the flower is white. The tuber is concentrated, and the position is high, so it is easy to harvest. The potato pieces are good in appearance, oval, smooth and yellowish, with shallow bud eyes and yellow flesh. The tuber is large and neat, with a length of 6 cm and a transverse diameter of 5 cm. There are 6% and 7 tubers per plant, and the yield per plant is about 0.4 kg. Spring sowing, yield 1800 to 2000 kg per mu, autumn sowing, 900 to 1000 kg per mu. Early maturing, sowing to the first harvest 85-90 days, plastic film mulching cultivation, can be harvested in the middle of April. Autumn sowing can be harvested in November. High resistance to mosaic virus, light susceptibility to mosaic virus and bacterial wilt. It has strong moisture resistance and is suitable for planting in paddy field in addition to dry land. Excellent quality and good taste.

Main points of ③ cultivation.

a. Seed potato treatment. Before sowing, spread the seed potato thinly in a warm place or in the sun for several days, so that the buds and potato skins are green, and then cut into pieces and sow, the seedlings can emerge 3-5 days earlier, and it is beneficial to strong seedlings.

b. Suitable time for early sowing and film mulching cultivation. Sowing in the northeast region in early February, plastic film mulching can be advanced to the end of January; in order to compete for the early listing of the season, double film mulching measures can be taken, that is, plastic film plus bow shed, and the sowing date can also be advanced. Sow in autumn and sow in late August.

c. The cultivation of high border emphasizes the cultivation of soil. The suitable density of Dongnong 303 is 400000plants per mu, and the cultivation density of plastic film mulching can be increased to 6000 plants. Before sowing, the high bed with a width of 85 cm and 90 cm was planted in double rows, with a spacing of 25 cm and 30 cm. The position of tuber is high, combined with weeding and soil cultivation for 2 or 3 times before seedling emergence and ridge sealing to prevent potato pieces from being exposed.

d. Heavy application of base fertilizer, early topdressing. The base fertilizer is 1500-2000 kg of fertilizer, 20-25 kg of superphosphate and 10-15 kg of potassium sulfate. the combined application of coke ash and plant ash is more beneficial to produce more potatoes and produce large potatoes. After finishing the seedlings, 250 kilograms of human feces and urine were poured in time, and then 7.5 kilograms of urea and 7.5 kilograms of potassium sulfate were applied in 7 days per mu.

The suitable range of ④. It is suitable for planting in Jiangsu and Zhejiang.