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Soybean Formula Fertilization Technology
Soybean plants go through three main growth stages: the seedling stage, the flowering stage, and the pod development stage. During the seedling phase, the plant focuses on establishing a strong root system and early foliage. The flowering period marks the peak of nitrogen uptake, making it a critical time for nutrient management. Phosphorus absorption is highest during the transition from flowering to pod formation, while potassium uptake peaks during the pod-filling stage. The overall pattern of nitrogen absorption follows a "low-high-low" trend, while phosphorus shows a "high-low-high" pattern. Therefore, it's essential to ensure adequate nitrogen supply during flowering, and phosphate should be applied as a base or seed fertilizer.
For optimal growth, soybeans require approximately 2–5 kg of nitrogen, 5–7.5 kg of phosphorus, and 7.5–10 kg of potassium per mu. This can be achieved using farmyard manure (20–30 kg), urea (8 kg), superphosphate (20–25 kg), and potassium chloride or sulfate (10 kg). Nitrogen can be applied as a base, seed, or top-dressing fertilizer, while phosphorus is best used as a base or seed fertilizer. Potassium is usually applied as a base fertilizer.
Base fertilization typically involves mixing organic manure with phosphorus and potassium fertilizers. A common mix includes 20 kg of farmyard manure, 2.5 kg of urea, 20–25 kg of superphosphate, and 2–3 kg of wood ash. After composting for about two weeks, the mixture is ready for planting.
Seed fertilizer is applied when the base fertilizer is insufficient. A typical application includes 10–15 kg of calcium phosphate and 3–5 kg of ammonium nitrate per mu, or about 5 kg of ammonium phosphate. Fertilizer should be placed 8–10 cm deep and 6–8 cm away from the seeds.
Top-dressing is necessary if the base fertilizer was not sufficient or if soil fertility is low. During early flowering, 4–5 kg of urea or 5–10 kg of ammonium nitrate per mu can be applied, keeping a distance of around 10 cm from the plants. If the soil lacks phosphorus, ammonium phosphate is an ideal choice. In high-fertility soils, avoid applying extra nitrogen. Top-dressing is best done during the flowering or late flowering stage, using 1–2 kg of urea and 75–100 g of potassium dihydrogen phosphate mixed in 40–50 kg of water.
Zinc deficiency can be corrected by applying 0.5–1 kg of zinc sulfate per acre at sowing, or by spraying a 0.2–0.3% zinc sulfate solution during the seedling and early flowering stages. For boron, if the soil has less than 0.5 mg/L available boron, a 0.1% boric acid or borax solution can be sprayed on leaves for better nutrient absorption.
Molybdenum is also important for soybean growth. It can be applied as a seed coating, root drench, or as part of the seed fertilizer. For seed treatment, mix 1–2 grams of ammonium molybdate per kilogram of seeds with water until the seeds are moist but not wet. Dry them in the shade before planting. Alternatively, apply a 0.05–0.1% ammonium molybdate solution (50 kg/mu) before the seedling to flowering stage. As a seed fertilizer, dissolve 10 grams of ammonium molybdate in water and mix with phosphate or manure for application.