What is Potassium ppm?
- ppm (parts per million) means how many milligrams of potassium are present in one liter of water or soil solution.
- For example, 100 ppm means there are 100 milligrams of potassium in 1 liter.
What is Potassium meq/L?
- meq/L (milliequivalents per liter) measures the chemical activity of potassium in the solution.
- It helps understand how potassium ions interact with the soil and plants.
Why convert ppm to meq/L?
- Some fertilizer recommendations and soil tests use meq/L.
- To compare or use these values correctly, you need to convert ppm to meq/L.
How to convert Potassium ppm to Potassium meq/L?
Use this formula:
Potassium (meq/L)=Potassium (ppm)/Atomic weight of K/Valence of K
Where:
- Atomic weight of potassium (K) = 39
- Valence (charge) of potassium ion (K⁺) = 1
So,
Potassium (meq/L)=Potassium (ppm)/39
Example:
If potassium concentration is 78 ppm:
Potassium (meq/L)=78/39=2 meq/L
Summary:
- Divide the potassium ppm value by 39 to get potassium in meq/L.
- This helps you understand potassium’s availability and adjust fertilizer needs properly.
You can find more agriculture conversion calculators here.