The pH of your fertilizer may fluctuate due to a variety of factors, such as the type of fertilizer you are using, the quality of water you are mixing it with, and the temperature of the environment.
One possible reason for pH fluctuations is the chemical composition of the fertilizer. Some fertilizers may have acidic or basic properties that can affect the pH of the solution when mixed with water. Additionally, some fertilizers may react with water to form acidic or basic compounds, which can also affect the pH.
Another factor that can influence pH fluctuations is the quality of water you are using. If the water you are using has a high or low pH, it can affect the overall pH of the fertilizer solution. This is because water with a high pH (alkaline) can neutralize acidic compounds in the fertilizer, while water with a low pH (acidic) can make the solution more acidic.
Temperature can also play a role in pH fluctuations. If the fertilizer solution gets too hot or too cold, it can cause changes in pH due to chemical reactions or solubility changes.
To prevent pH fluctuations, it's important to monitor the pH of your fertilizer solution regularly and make adjustments as needed. You can use pH testing strips or a pH meter to check the pH of the solution and adjust it by adding acidic or basic compounds, such as vinegar or baking soda, respectively. It's also important to use high-quality water and mix the fertilizer solution at a consistent temperature to minimize pH changes.