Sao Tome and Principe Seed Rate Calculator

Estimate seed quantities for your Sao Tome and Principe farm using maintained crop methods, spacing and germination adjustments. Confirm the planning result against your variety label and local extension advice.

🌿 20+ Crops 🇸🇹 Sao Tome and Principe-specific data 🌐 100% Free
🌿 Calculate Your Seed Requirement
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kg of seed per hectare
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Total seed needed (kg)
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Bags needed
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Plant population / ha
💰 Seed Cost Estimate (Sao Tome and Principe)
Certified Seed
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Farm-Saved (est.)
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📌 Planting Guide
    Spacing Layout (not to scale)
    ← row spacing → ↑ plant spacing ↑
    🔧 Calculation Breakdown
      💳 Seed Storage Tips
      🔎 Simple On-Farm Germination Test

      Before planting, test your seed lot — takes only 7 days:

      1. Count out exactly 100 seeds from your seed lot.
      2. Spread on a damp cloth or paper towel. Fold over and keep moist (not waterlogged) in a warm place (25-30°C).
      3. Check daily for 7-10 days. Count sprouted seeds each day.
      4. Calculate: Germination % = sprouted ÷ 100 × 100
      5. If germination is below 70%, increase your seed rate by 20-30% or source fresh certified seed.
      🇸🇹 Seed Programs & Sources in Sao Tome and Principe
      Local Seed Programs: Contact your national seed certification authority or agricultural extension service for information on subsidised seed programs and certified seed suppliers in Sao Tome and Principe.
      • Certification BodyContact the national seed certification authority in Sao Tome and Principe for certified seed sources.
      • Key SuppliersConsult your local agro-dealer network or agricultural extension office for certified seed suppliers in Sao Tome and Principe.
      • Research SupportCGIAR centers (CIMMYT, IITA, CIP, ICRISAT, IRRI) provide improved varieties and technical support across Africa.
      • Extension ServiceContact your district or county agricultural extension office for local variety recommendations and seed sources.
      • Hybrid Seed WarningSecond-generation hybrid seed loses 20-30% yield potential. Buy fresh hybrid seed each season.
      🧪 Seed Treatment Recommendations

      Proper seed treatment protects your investment and improves germination:

      • Cereals (maize, rice, sorghum)Fungicide dressing: Thiram + Metalaxyl (Apron Star). Protects against seed-borne diseases and soil fungi. Apply 2-3 g per kg of seed.
      • Legumes (soybean, cowpea)Rhizobium inoculant (for soybean: Bradyrhizobium japonicum). Improves nitrogen fixation. Never use with systemic fungicides — apply inoculant 30 min before planting.
      • GroundnutCheck for aflatoxin. Never plant mouldy or discoloured seed. Thiram dressing reduces soil-borne diseases.
      • Vegetative cropsCassava: dip cuttings in Mancozeb solution (2g/L) for 5 min to control mosaic virus vectors. Yam: treat minisetts with Apron Star + copper fungicide.
      Data sources: FAO crop guidance, CGIAR, Sao Tome and Principe national agricultural authority and World Bank. Tomato planning parameters also reference FAO crop information.
      Seed rates are indicative — actual requirements vary by variety, soil, and season. Always verify with your local extension agent. Last updated: 2026.

      Farming context: Sao Tome and Principe

      Sao Tome and Principe seed estimates use the selected crop, spacing, seed quality and field assumptions from the ST agriculture dataset. Check the variety label and local conditions before buying seed.

      Agriculture share of GDP~12%
      Arable land9,000 ha
      Irrigated share~10%
      Main food cropsbanana, cassava, oil palm
      Main export cropscocoa, coconut, coffee robusta

      Growing regions at a glance

      RegionAnnual rainfallMajor crops
      Sao Tome Island2000 mmcocoa, coffee_robusta, banana, cassava, oil_palm
      Principe Island2200 mmcocoa, coconut, banana, cassava, oil_palm

      Country context from the AfroTools agriculture dataset - planning reference, not agronomic advice. Confirm with local extension services.