Calculate NPK fertilizer requirements for banana and plantain based on plant density, target yield, NPK ratio, and fertilizer efficiency. For commercial Cavendish plantations and smallholder plantain systems.
Enter plants per hectare, target yield, compound NPK ratio, efficiency, and area to get nutrient needs and total fertilizer required.
Nutrient Removal (kg/ha) based on target yield (t/ha):
N = Yield × 5 (bananas remove ~5 kg N per ton of fruit)
P₂O₅ = Yield × 1.2
K₂O = Yield × 8 (bananas are heavy K feeders — K is often the most limiting nutrient)
Compound Fertilizer (kg/ha) = Limiting Nutrient Need ÷ (Nutrient% ÷ 100) ÷ Efficiency%
Typical banana fertilizer: 17-7-23 or 14-8-28 (high K formulas). Apply in 4-6 split applications per year.
Commercial Cavendish: 1,500 plants/ha, target 40 t/ha, using 17-7-23 at 55% efficiency: N need = 40×5 = 200 kg/ha, P₂O₅ = 48 kg/ha, K₂O = 40×8 = 320 kg/ha. With 17-7-23: K is limiting: 320÷0.23 = 1,391 kg. Adjusted for 55%: 2,529 kg/ha. For 1 ha: 2.53 tons. (Split into 6 applications of ~420 kg/ha every 2 months.)
1. Enter plant density (Cavendish: 1,200-1,800 plants/ha at 3m×2m to 2.5m×2.5m; plantain: 800-1,200). 2. Target yield (Cavendish: 30-60 t/ha; plantain: 10-25 t/ha). 3. NPK ratio of your fertilizer (banana-specific formulas are high-K: 17-7-23, 14-8-28). 4. Efficiency (50-60% on tropical soils). 5. Area. Calculate. Split into 4-6 applications/year.
Bananas are the 4th most important staple crop globally and the most traded fruit. They are heavy nutrient feeders, especially potassium (K₂O demand is 2-4x N). Commercial Cavendish plantations in Philippines, Ecuador, Costa Rica, and Colombia apply 2,000-3,500 kg/ha/year of compound fertilizer. Smallholder plantain in West and Central Africa (Cameroon, Nigeria, Ghana) often yields only 5-15 t/ha due to low inputs, pests (black sigatoka, nematodes), and poor soil fertility. Fertigation (drip + fertilizer) can reduce fertilizer use by 30-40% while increasing yield.
Using balanced NPK (15-15-15) — bananas need much more K than N or P; high-K formulas (17-7-23) are standard. Applying all fertilizer at once — bananas need continuous nutrient supply, split into 4-6 applications. Ignoring micronutrients — bananas often need Mg, Zn, and B supplements on tropical soils. Not accounting for nutrient recycling from crop residues (leaves, pseudostems return significant K).
✓ Expert Reviewed: This calculator and its content have been reviewed by agricultural experts. Formulas are based on standard extension service recommendations.