I am working on a model, and I have calculated the nitrate values in drainage outflow in ppm, but the model is giving me values in kg/ha area basis, how I can convert my ppm values to kg/ha when I need to compare my observed and simulated data
what is known is that 1 ppm = 1mg / L
what is known is that 1 ppm = 1mg / L
greeting
I have faced the same question when looking at groundwater used to irrigate farm fields. To convert mass/volume to mass/area, you will have to decide how many inches/cm of water will be applied per acre/hectare, and calculate the volume of water applied (e.g., acre-feet). The volume of water with a certain ppm of nitrate will give you the mass of nitrate applied per acre/hectare. The unknown here is what volume of water will be applied, so you could express that as pounds per inch of water applied or the equivalent.
Equation 1. Exposure (lb a.i/acre) from 2 acre-inches of irrigation water at Z mg/L
EEC lb a.i./acre = (Z mg/L) * (102,790 L water/ acre-in) * (2 inches) * (1 lb/ 453,592 mg)
Equation 2. Reduced form of Eq. 1.
EEC lb a.i./acre = (Z mg/L) * (0.45323)
Equation 3. Exposure (X inches of irrigation water) at Z mg/L needed to reach toxicity endpoint expressed in lb a.i./acre (e.g., IC25)
X inches = [(IC25 in lbs a.i./acre) *(acre-in /102,790 L water) * (453,592 mg/ 1lb)] / (Z mg/L)
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