Cultivation Techniques for the Sweet Potato Variety Guangzishu No. 1

Guangzishu No. 1 (Guangshu 95-1 / Guangshu 88-70) is a new sweet potato variety bred by the Crop Research Institute of the Guangdong Academy of Agricultural Sciences, and it passed variety approval in Guangdong province in March 2005.

1. Characteristics: The full growing period of summer-autumn sweet potato is 110-130 days. The tip leaves are purple at the margins, the leaf shape is shallowly compound, the veins are purple, the stems are green with purple, the plant form is semi-erect, the storage roots have purple-red skin and purple flower-colored flesh, the root shape is spindle-shaped and fairly attractive, storage tolerance is good, and sprouting ability is good. Dry matter rate 30.62%, eating quality 81.3 points, starch rate 19.51%, vitamin C content 23.54 mg per 100 g. Moderately resistant to sweet potato bacterial wilt. Suitable for summer and autumn planting in irrigated and dry land in our province.

2. Yield performance: In 2002-2003 it participated in the provincial high-quality group regional trial. Combining the results of the two-year regional trial, the average fresh root yield was 2375.0 kg per mu, an increase of 49.96% over the control variety Guangshu 111, an extremely significant increase; the average dry root yield was 732.7 kg per mu, an increase of 62.73%, an extremely significant increase.

3. Key cultivation techniques: (1) Select storage roots free of insect damage as seed roots for raising seedlings; after temporary planting and propagation of seedlings, select tender vigorous seedlings for planting, with 3000-3500 plants transplanted per mu; (2) The planting site is best dry land with irrigation capacity, and sandy loam soil is preferable, avoiding waterlogging in the field; (3) When preparing the land and making beds, apply 1500 kg of organic fertilizer and 25 kg of phosphate fertilizer per mu; 15-20 days after transplanting, apply 8-10 kg of urea per mu as a liquid fertilizer drench or hole application; about 50 days after planting, in combination with intertillage loosening of the soil and earthing up, and in combination with fertilization, apply 30 kg of potassium sulfate and 10 kg of urea per mu, or 20 kg of peanut bran; (4) Pay attention to the prevention and control of sweet potato bacterial wilt.