Introduction to the Improved Soybean Variety Guizao No. 2 (formerly coded 199)

Variety approval number: Gui Shen Dou 2004001

Breeding unit: Cash Crops Research Institute, Guangxi Academy of Agricultural Sciences

Variety source: selected from the Guangxi farmer variety "Lacheng Huangdou" through line selection.

Unit submitting for approval: Cash Crops Research Institute, Guangxi Academy of Agricultural Sciences

Characteristics: This variety belongs to the determinate podding type, is erect with a compact plant type, and has a spring sowing growth period of about 98 days. It generally has a plant height of 59.1 cm, 13.3 nodes on the main stem, and 2.4 branches. It has white flowers and gray hairs, and at maturity the pods are light brown. It has good leaf drop and does not shatter. The number of pods per plant is about 28.5, the number of seeds per plant is 56.1, the seed weight per plant is 8.7 g, the 100-seed weight is 16.5 g, and the purple stain rate is 2.8%. The seeds are oval, the seed coat is yellow and glossy, the appearance quality is good, and the hilum is light brown. The protein content of the seeds is 42.48%, and the oil content is 19.59%.

Yield performance: From 2000 to 2002, it participated in the autonomous region spring soybean trials. The average yield over three years and three crops was 149.51 kg per mu, an increase of 6.5% over the control variety Liudou No. 1 (not significant).

Key cultivation techniques: For spring planting, sow from late February to early March; for autumn planting, sow from late July to early August. For pure sowing, the density in plots with better water and fertilizer conditions is 20,000-25,000 plants per mu, and in poor land the density can be increased to 30,000 plants per mu. At sowing, apply 300-500 kg of organic fertilizer per mu as base fertilizer; at the first compound leaf stage, apply 10 kg of compound fertilizer per mu as seedling fertilizer; during the flowering and podding stage, apply additional fertilizer as appropriate according to growth. Throughout the entire growth process, cultivate and weed twice, and earth up in combination with additional fertilization.

Intercropping and relay intercropping: Plant 1-2 rows between rows of tall crops such as sugarcane, corn, and cassava, and strip planting is possible in young orchards. Sow as early as possible; sowing can be done once the temperature is stable at 12°C. Manage promptly after emergence, and reduce the amount of fertilizer by 1/3-1/2 compared with pure sowing. When the leaves turn yellow and 1/3 of the leaves have begun to drop, harvest promptly so as to benefit the growth of the main crop and field management.

Approval opinion of the autonomous region variety approval committee: After review, this variety meets the Guangxi soybean variety approval standards and has passed approval. It can be planted in soybean production areas throughout the region, and is especially suitable for planting in arid and poor barren areas, but attention should be paid to the prevention and control of downy mildew and purple stain disease.