Calculate N-P-K fertilizer requirements based on target yield, crop nutrient needs, and fertilizer efficiency.
Get precise N-P-K fertilizer recommendations based on your target yield, crop nutrient requirements, and fertilizer efficiency. Calculate compound fertilizer amount plus urea and potassium supplements. Optimize nutrient application, reduce waste, and lower input costs.
You spread 200 kg of 15-15-15 per hectare and wondered why corn leaves turned yellow at tasseling. The compound fertilizer gave equal N, P, and K, but corn needs twice as much nitrogen as phosphorus. You ended up with excess P and deficient N. This calculator tells you exactly how much compound plus supplemental urea to apply.
Scientific fertilization optimizes yield, quality, and cost. Calculate based on crop needs, soil supply, fertilizer content, and efficiency.
A: Compound fertilizer provides balanced N-P-K, but most crops need more nitrogen than the compound ratio provides. The calculator first determines how much compound fertilizer covers the limiting nutrient, then calculates supplemental urea for nitrogen and KCl for potassium.
A: Typical efficiency: nitrogen 30-50%, phosphorus 15-25%, potassium 40-60%. Use 40% as a general default. Efficiency varies by soil type, weather, application method, and timing. Split nitrogen applications (basal + topdress) improve efficiency significantly.
A: This calculator is designed for synthetic fertilizers. For organic, use our Organic Fertilizer Calculator which accounts for slower nutrient release and lower first-year availability (typically 30% of total N in year one).