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High-yield soybean Kaidou No. 4 improved from an American variety

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Kaidou No. 4 is a high-yield, high-quality new soybean variety developed by Kaifeng Zhengda Company of Henan Province, with the support of the State Administration of Foreign Experts Affairs, from advanced-generation lines introduced from the United States, through irradiation treatment and systematic selection. Determinate podding habit. Plant height 75 cm. 6-8 branches per plant. Leaves ovate. White flowers. Seeds yellow, brown hilum, oval. 100-seed weight 15.6 g. Contains 42.1% crude protein and 2.03% fat. Medium maturity, summer-sown growth period 110 days. Outstanding features include dense podding; high yield, 200-400 pods per plant, generally 250

Kaidou No. 4 is a high-yield, high-quality new soybean variety developed by Kaifeng Zhengda Company of Henan Province, with the support of the State Administration of Foreign Experts Affairs, from advanced-generation lines introduced from the United States, through irradiation treatment and systematic selection. Determinate podding habit. Plant height 75 cm. 6-8 branches per plant. Leaves ovate. White flowers. Seeds yellow, brown hilum, oval. 100-seed weight 15.6 g. Contains 42.1% crude protein and 2.03% fat. Medium maturity, summer-sown growth period 110 days. Outstanding features include dense podding; high yield, 200-400 pods per plant, generally 250-300 kg per mu, up to 350 kg at high yields. Lodging-resistant. Non-shattering pods. Strong resistance, excellent quality, fat content 1.5 percentage points higher than ordinary soybeans, especially suitable for industrial processing.

As a demonstration and extension of agricultural foreign-expert results by the State Administration of Foreign Experts Affairs, it has been introduced and tested in 13 provinces and cities, generally showing high yields. For example, the Weishi County Science and Technology Commission extended 1000 mu with an increase of 275-300 kg, up to 360 kg at high yields, 50-150 kg more than local soybeans, and 100 yuan more income than growing corn. Its application prospects are very broad, and it is of great significance for increasing farmers' income and adjusting the planting structure, especially as introduction and propagation in the first 1-2 years can be promoted as seed with very high returns.

It can be sown in spring and summer. The suitable summer sowing period is early June; before sowing, water the soil moisture well to strive for full emergence with one sowing, use 2.5 kg of seed per mu, keep 10,000-13,000 plants, and apply 30 kg of compound fertilizer at early flowering. Combined with pest and disease control, spray micro-fertilizers such as boron and molybdenum, and harvest in good time after full maturity.

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