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Introduction to the soybean variety Jihuang 13 (formerly Jihuang 103)

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Characteristics: White flowers, brown pubescence, lanceolate leaves, semi-determinate podding habit. Average growth period 139 days, plant height 102.7 cm, effective branches 1.3, effective pods per plant 41.2, seeds per plant 91.6, seed weight per plant 17.8 g, 100-seed weight 19.9 g. Yellow seed coat, brown hilum, round seeds. Upon inoculation identification by the Soybean Research Center of the Jilin Academy of Agricultural Sciences, moderately resistant to soybean mosaic virus strain SMV1, moderately susceptible to mixed SMV strains, and moderately susceptible to soybean cyst nematode race 4. Average

Characteristics: White flowers, brown pubescence, lanceolate leaves, semi-determinate podding habit. Average growth period 139 days, plant height 102.7 cm, effective branches 1.3, effective pods per plant 41.2, seeds per plant 91.6, seed weight per plant 17.8 g, 100-seed weight 19.9 g. Yellow seed coat, brown hilum, round seeds. Upon inoculation identification by the Soybean Research Center of the Jilin Academy of Agricultural Sciences, moderately resistant to soybean mosaic virus strain SMV1, moderately susceptible to mixed SMV strains, and moderately susceptible to soybean cyst nematode race 4. Average crude protein content 39.6%, crude fat content 21.7%.

Yield performance: In 2002, it participated in the Northwest Spring Soybean Variety Regional Trial, with an average yield of 221.04 kg per mu, 5.2% higher than the control Jindou 19; in 2003, in the continued trial, the average yield was 207.64 kg per mu, 5.04% higher than the control Jindou 19; the two-year regional trial average yield was 214.34 kg per mu, 5.12% higher than the control Jindou 19. In 2003, it participated in the Northwest Spring Soybean Variety Production Trial, with an average yield of 191.09 kg per mu, 0.79% higher than the control Jindou 19.

Key cultivation techniques: 1. Sowing time: early to mid-May. 2. Density: mechanical sowing rate 4.5-6 kg per mu, manual dibbling about 4 kg per mu. For plots with better fertility, retain about 16,000 plants per mu; for lower-fertility sandy soil, retain 20,000-22,000 plants per mu. 3. Watering: except in years of special drought, generally do not water at the seedling stage. During drought, water can be applied at the branching stage. According to soil moisture or rainfall, water well at flowering and seed-filling stages. 4. Fertilization: when preparing land for spring sowing, apply 20 kg of nitrogen-phosphorus-potassium compound fertilizer or 15-20 kg of diammonium phosphate as base fertilizer. From early flowering to 10 days after flowering, apply about 10 kg of urea as topdressing in combination with watering.

Approval opinion: Upon review, this variety meets the national soybean variety approval standards and has passed approval. This variety is a late-maturing, high-oil soybean variety with good yield potential and strong lodging resistance, suitable for spring sowing in high-fertility plots in northern Shaanxi, eastern and central Gansu, and central Shanxi.

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