I am working on a project with sensors which are able to measure agricultural levels of nitrogen/potassium/phosphor, but also moisture/temperature/ph level. The sensor measures in mg/kg but the farmers we are trying to help need it in kg/hectare. We got the following formula to convert but the outcome is not right, I do think I know why but not how to solve it.
Nitrogen in kg/hectare= (mg N/kg x depth of measurement in CM x density of the soil in G/cm3)/10
I think the outcome is not perfectly right because of the depth of measurement. Normal with hand tests which are sent to the lab, the depth of measurement is more accurate and matters more. But I do not have a clue how to correct the formule, does anyone have experience in this field and know how to fix this?
Thank you for reading.
Morris la Crois
@ Morris, you first check the probe lengths of your sensor , normally it measure depths between 30 cm (11 in) to 100 cm (40 in). Accordingly you modify the equation for calculation.
Morris, The short answer is to multiply mg/kg by kg/ha for whatever the depth. I'm guessing that the farmers are thinking in terms of amendment (fertiliser) rates. It seems from JC Tarafdar's response that you may be looking to make an educated guess about availability in the root zone, Paul.
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