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What in your irrigation water affects your media pH?
The pH of your media is most affected by the alkalinity of your irrigation water, or better stated your media pH can be affected relative to how high the alkalinity of your irrigation water may or may not be.
Irrigation water that is alkaline contains bicarbonates, the more bicarbonates the higher the alkalinity. As we irrigate our crops over time, these bicarbonates will increase media pH. When you irrigate with alkaline water you are essentially adding small doses of bicarbonates or lime to the media and therefore increasing the probability of elevating the pH of the media, which we know can affect your crop. This phenomenon becomes even more important the smaller the pot size, as the pH can climb more rapidly in smaller containers.
In some cases it is possible that irrigating with alkaline water may not affect the crop: bicarbonate levels may not be sufficient to increase the media pH, with short term crops there may not be enough time for the pH to rise or the plant may be more tolerable to a high media pH and not display any symptoms. Nonetheless monitoring and knowing the alkalinity of our irrigation water will help you be proactive and allow you to take measures that will prevent future challenges.
Keep this fact in mind and be sure to have your water tested in order to prevent these problems from occurring, especially if you suspect high alkaline irrigation water.
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