Controlling pH Levels of Growth Media

The acidity or alkalinity levels of plant growth media fluctuate within certain range. The fluctuation is determined by various factors such as the type of growth media, the amount of water, and concentration of specific minerals. Most plant species thrive in growth media that have pH range of between pH 5.5 and pH 7.0, which is from slightly acidic to neutral.

On the other hand, there are plants such as oregano and hardy carnation that prefer highly alkaline growth media, ranging from pH 8 to pH 10. Hence, the alkalinity or acidity level of the growth media must be adjusted depending on the species of plant. There might be a need for regular measurements and adjustments to prevent the plants from dying.

Depending on the plant species and its needs, the pH level may be adjusted within the ideal range by either adding certain types of minerals or diluting these minerals with water. Rain, over-watering, application of fertilizers, presence of other plants, and natural weathering process can upset the pH balance. The number one cause of soil acidity is rain itself. Rain is slightly acidic at pH 5.7 because of its reaction with the carbon dioxide in the air, formic carbonic acid in the process.

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