How to Test the pH of Your Soil Mix

Maintaining the optimum pH level in your soil is crucial for growing healthy plants. Many people are unaware of how to test soil pH effectively. This article will outline a simple method for testing the pH of any soil or soilless mix, allowing you to identify and correct potential issues.

Preparing for the pH Test​

Step 1: Wait for the Soil to Dry​

Before testing the pH of your soil, wait until it has dried out and is ready for its next watering.

Step 2: Adjust the pH of the Water​

Take some plain water that you usually use for watering your garden and adjust its pH to 7.0. Ensure you know the exact pH of the water you will be using to test your soil. A neutral pH of 7.0 is ideal, but a range of 6.5 – 7.0 will also work.

Testing the Soil pH​

Step 3: Collect Runoff Water​

Place your pot into a bowl to catch the runoff water. Slowly water the soil with the pH-adjusted water until water starts dripping from the bottom. Collect the first few drops of water, as they provide the most accurate reading of your soil's pH.

Step 4: Perform the pH Test​

Test the pH of the collected runoff water and compare it to your initial pH test.

Analyzing the pH Test Results​

If the runoff test result is slightly lower than your starting pH value (e.g., starting value of 7.0 and runoff pH of 6.5), your soil does not need any immediate adjustments. However, it is essential to continue testing the pH throughout the plant's life cycle to prevent nutrient lockout.

Correcting the Soil pH​

Step 5: Add Lime if Necessary​

If the pH has dropped significantly (e.g., to around 5.5), you will need to add lime to your soil to increase the pH. Remove the top inch of soil without damaging the roots, evenly sprinkle 1 teaspoon (5 ml) of lime per gallon of soil, and then replace the removed soil. Thoroughly water the soil to incorporate the lime.

Step 6: Monitor and Adjust​

Repeat the pH test during your next watering session to ensure the pH has stabilized. If more lime is needed, repeat the process until the runoff pH is close to 6.5 – 7.0.

Conclusion​

Regularly testing and adjusting your soil's pH is crucial for avoiding nutrient deficiencies caused by pH lockout. By following the steps outlined in this article, you can maintain the optimal pH level for your plants and promote their healthy growth.