What is Calcium meq/100g?
- meq/100g means milliequivalents of calcium per 100 grams of soil.
- It is a way to measure the amount of calcium in the soil based on its chemical charge.
What is Calcium ppm?
- ppm means parts per million.
- It tells you how many milligrams of calcium are present in one kilogram of soil.
- It’s a common way to express nutrient concentration in soil and easier to understand for fertilizer recommendations.
Why convert Calcium meq/100g to ppm?
- Different soil reports use different units.
- To know exactly how much calcium you have in the soil in a familiar unit (ppm), you need to convert.
- This helps in deciding how much calcium fertilizer you may need.
How to convert Calcium meq/100g to ppm?
- Know the formula:
Calcium (ppm)=Calcium (meq/100g)×Equivalent weight of Calcium×10
- Equivalent weight of Calcium:
- Calcium ion (Ca²⁺) has a valence of 2.
- Atomic weight of calcium = 40 g/mol.
- Equivalent weight = Atomic weight ÷ Valence = 40/2=20 mg/meq.
- Putting it all together:
Calcium (ppm)=Calcium (meq/100g)×20×10=Calcium (meq/100g)×200
Example:
If your soil test shows 2 meq/100g of calcium:
Calcium (ppm)=2×200=400 ppm
Summary:
- Multiply the calcium value in meq/100g by 200 to get calcium in ppm.
- This helps you understand how much calcium is in your soil using a common unit.
You can find more agriculture conversion calculators here.