A New Potato Variety-Zhongshu 7

Suitable scope: planting in spring and autumn in Beijing, Shanghai, Jiangsu, Zhejiang, Anhui, Jiangxi, Shandong and Henan Central Plains, and early winter cultivation in the southern winter cropping areas of Fujian, Guangdong and Guangxi.

Variety source: Zhongshu 2 × Ji Zhangshu 4 was selected by sexual hybridization system.

Characteristic characteristic

The growth period of early-maturing varieties is 64 days after emergence. The plant type is semi-erect, the growth potential is strong, the plant height is 50 cm, the leaf is dark green, the stem is purple, the Corolla is purple, the tuber is round, the yellowish skin is smooth, the bud eye is shallow, the stolon is short, the tuber is concentrated, and the commercial potato rate is 61.7%. Inoculation identification: medium resistance to light mosaic virus, high resistance to severe mosaic virus, mild to moderate susceptibility to late blight. Tuber quality: fresh potato vitamin C content 32.8 mg / 100 g, starch content 13.2%, dry matter content 18.8%, reducing sugar content 0.20%, crude protein content 2.02%.

Yield performance: participated in the national potato variety regional trial from 2004 to 2005, the tuber yield per mu of the early maturing Zhongyuan second cropping group was 1653 kg and 1528 kg respectively, which decreased by 8.2% and increased by 26.1% compared with the control Dongnong 303, with an average yield of 1591 kg per mu in two years. 5.5% higher than the control Dongnong 303 The tuber yield per mu of the southern winter cropping group was 1702 kg and 1437 kg respectively, which was 16.5% and 65.2% higher than that of the control Dongnong 303, with an average yield of 1570 kg per mu in two years and 34.6% higher than that of the control Dongnong 303. In the production experiment of the precocious Zhongyuan second cropping group in 2005, the yield of tuber per mu was 1902 kg, which was 7.3% higher than that of the control Dongnong 303. This variety accords with the national potato variety approval standard and has been approved. It is an early-maturing fresh food variety with medium resistance to light mosaic virus, high resistance to severe mosaic virus and mild to moderate susceptibility to late blight.

Key points of cultivation

1. The second cropping area of the Central Plains was sowed from early January to mid-March in spring, harvested from May to late June, and sowed from the first ten days of August to the first ten days of September in autumn. Soaking with gibberellin solution of 5mg / L for 10 minutes before sowing, it was covered with moist sand to accelerate germination, and harvested from late October to early December. Plastic film mulching can be sowed early in spring. The seeds were sown from October to December in the southern winter cropping area. two。 Suitable sparse planting, horizontal sowing row spacing of 60cm to 70cm, plant spacing of 25cm to 30cm, density of 4000cm to 4500 plants per mu. In order to improve the reproduction coefficient, the density per mu can be increased to 6000,6500 plants. 3. Select the land with loose soil and convenient irrigation and drainage to sow seeds, avoid continuous cropping, and prohibit rotation with other Solanaceae crops. The remaining fields should be isolated from commercial potato production fields and other disease crops. Apply sufficient basal fertilizer, strengthen early management after emergence, cultivate soil and plough in time, promote early growing and early fruiting, timely irrigation during tuber setting period and tuber expansion period, stop irrigation one week before harvest to facilitate harvest and storage. 4. Suitable for intercropping with cotton, corn and other crops. The remaining seeds in the second cropping area should be harvested early in spring and sown late in autumn, and pay attention to timely spraying to control aphids and pull out diseased plants.