Soybean Growing Guide
Major oilseed and protein crop. Nitrogen-fixing legume that improves soil fertility. Used for food, feed, and industrial products.
Growing Conditions
Soil Requirements
Soil Type & pH
Best soil types: loam, silt loam, clay loam
pH range: 6 - 7 (optimal: 6.5)
Drainage: good
Nutrient Needs (N-P-K)
Planting Guide
Yield & Economics
Common Pests & Diseases
Common Pests
- Soybean aphid
- Bean leaf beetle
- Japanese beetle
- Stink bugs
- Spider mites
Common Diseases
- Soybean rust
- Phytophthora root rot
- Sudden death syndrome
- White mold
- Brown stem rot
Use to identify issues early and prevent crop losses.
Growing Tips
Inoculate soybean seed with Bradyrhizobium japonicum bacteria before planting in fields without recent soybean history — this enables nitrogen fixation.
Soybeans fix their own nitrogen, so they rarely need N fertilizer. Applying nitrogen actually reduces nodulation and wastes money.
Plant when soil temperature reaches 13°C — soybeans are sensitive to cold soil and germinate poorly below 10°C.
The R1-R5 growth stages (flowering through seed fill) are the critical water demand period — irrigation during this window has the highest yield return.
Harvest at 13% seed moisture for direct combine harvest. Delay increases pod shatter losses, especially with dry weather and wind.
Soybeans are an excellent rotation crop before corn — they leave 40-80 kg/ha of nitrogen credit in the soil from fixation.
Frequently Asked Questions
How long does Soybean take to grow?
Soybean typically takes 100 days from planting to harvest. Seeds germinate in about 7 days. The best planting season is spring, early summer.
What soil does Soybean need?
Soybean grows best in loam, silt loam, clay loam soil with a pH of 6-7. Good drainage is required.
What temperature does Soybean need?
Soybean grows best at 20-30°C. Frost tolerance: none. Heat tolerance: moderate.
What is the expected yield for Soybean?
Soybean yields approximately 2,800 kg/hectare under good conditions.
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