Kg to Litres for Agriculture: Sprayer Calibration & Liquid Fertilizer Guide
Application rates (L/ha vs kg/ha), spray boom calibration, UAN liquid nitrogen specific gravity, and pesticide tank mixing.
Modern precision agriculture applies liquid fertilizers (such as Urea Ammonium Nitrate / UAN) and crop protection products based on exact nutrient targets (kg of active Nitrogen per hectare). However, field tractor sprayers and flow meters are calibrated exclusively in litres per minute (L/min) and litres per hectare (L/ha). Converting between mass and volume with density corrections is essential to avoid crop damage or under-fertilization.
1. Liquid Fertilizer Specific Gravity & Nozzle Calibration
Standard sprayer calibration charts are based on pure water (density = 1.00 kg/L). Dense liquid fertilizers flow more slowly through spray nozzles at the same pressure, requiring a specific gravity conversion factor.
Conversion Factor = √(Specific Gravity of Fertilizer) To find water-equivalent nozzle flow rate: Water Equivalent Flow (L/min) = Measured Fertilizer Flow × √(SG).
| Fertilizer Solution | Density @ 20°C (kg/L) | Specific Gravity (SG) | Nozzle Correction Factor |
|---|---|---|---|
| UAN 28 (28% Nitrogen) | 1.280 kg/L | 1.28 | 1.13 |
| UAN 32 (32% Nitrogen) | 1.320 kg/L | 1.32 | 1.15 |
| Liquid Ammonium Polyphosphate (10-34-0) | 1.400 kg/L | 1.40 | 1.18 |
| Liquid Potassium Thiosulfate (KTS) | 1.460 kg/L | 1.46 | 1.21 |
| Water (Baseline) | 1.000 kg/L | 1.00 | 1.00 |
Common Liquid Fertilizer Densities and Nozzle Flow Correction Multipliers
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Frequently Asked Questions
Common practical questions regarding Agronomy & Crop Protection.