Yougui Summer Orange

Yougui Summer Orange

　　Breeding Unit: Baise Youjiang District Fruit and Vegetable Production Management Office

　　Guangxi Zhuang Autonomous Region Fruit Production Technology Guidance Station

　　Baise Youjiang District Liusha Horticultural Farm

　　Variety Source: A new early-maturing bud mutation variety selected from the Yougui Summer Orange orchard at Liusha Horticultural Farm, Baicheng Subdistrict, Baise Youjiang District.

　　Characteristics: The tree canopy is nearly round-shaped, with a robust tree vigor; young shoots are bluish-green, with moderately small branching angles, high and stable yield. The fruit is flat-round, averaging 195.6 grams per fruit with uniform size. The peel is orange-yellow, evenly colored, and relatively smooth; it has few seeds. The edible rate of the fruit is 78%, juice content is 55.32%, and soluble solids content is 12.4%. It has a well-balanced sweet and sour taste, rich flavor, and fine-textured flesh.

　　Yield Performance: In 2004, yield was 105.7 kg per plant; in 2005, 100.4 kg per plant; in 2006, 110.2 kg per plant; in 2007, 123.1 kg per plant.

　　Cultivation Key Points: 1. Use grafted seedlings for planting, with row and plant spacing of 4m × 3m, planting 56 plants per 667m². 2. Pruning and Training: Adopt a natural round-headed shape, cut back main branches or their extensions at about 50 cm, leave an outward-facing bud at the cut, then select the first and second lateral branches. 3. Fertilization: Apply fertilizer twice a year. The first application is before sprouting in January, using heavy organic fertilizer (mainly tung oil cake), applying 10 kg per plant, 0.25 kg of potassium sulfate compound fertilizer, and 1 kg of calcium superphosphate; the second application is during fruit enlargement and before the emergence of autumn shoots in early July, applying 2–3 kg of compound fertilizer and 0.25–0.5 kg of urea per plant. 4. Flower Promotion and Early Yield Measures: ① Branch Spreading: Spread upright main branches to about a 60-degree angle to moderate tree vigor; ② Application of techniques such as girdling or ring barking; ③ During the early fruiting stage of young trees, reduce nitrogen fertilizer application in May and increase phosphorus and potassium fertilizers. 5. Integrated pest and disease management.