Work out urea requirement instantly with clear inputs, formula shown and shareable results.
Urea is 46% nitrogen, so every kilogram of N needs 1/0.46 = 2.174 kg of urea. Splitting the total across two or three top dressings matches supply to crop demand and cuts losses to volatilisation and leaching. Indian urea bags are 45 kg.
Urea from nitrogen
Urea (kg) = N required (kg) / N content fraction
Split dose
Per application = total urea / number of splits
Excess nitrogen leaches to groundwater as nitrate and is lost to air as ammonia and nitrous oxide. Apply only the soil-test recommended rate.
Urea converts to nitrate quickly and nitrate leaches. Applying it in two or three doses timed to peak uptake raises recovery from around 30-40% to 50-60%.
Incorporating or irrigating it in immediately cuts ammonia volatilisation losses, which can reach 20-30% from urea left on a warm dry surface.