Mineral pH adjusting products are generally made using the following ingredients:
When growing cannabis, and almost any other type of plant, there are various factors that influence how they grow and the quality of the final product such as the quality of the air, water, sun and soil. Any sort of issue with the quality or presence of these parameters will generally produce poorly plants that are likely to catch more illnesses and/or be infested by insects or fungi. That’s why we’re going to be talking about pH for cannabis plants; pH is one of the most determining factors when it comes to feeding cannabis plants and having them absorb everything you give them.
Figuring out how to adjust the pH in your water isn’t that complicated at all. You need to discern between watering using nutrients and only water, and there will be a difference between using automatic watering systems and watering manually.
In order to use this continuous pH, EC and temperature meter correctly, all you have to do is place the monitor at head-height so that you can easily take a look at it, and then you’ll need to adjust the pH and EC in your water, depending on your plants’ needs and the period that they’re in. It also has a visual alarm system (a blinking light) that lets you know when the pH or EC in your nutrient tank aren’t at the right values, allowing you to correct almost any fluctuation instantly.
This process varies depending on the fertilizers used; some brands recommend adjusting the pH before adding their products, whereas others recommend measuring and adjusting the pH after adding them to your water. If the manufacturer has not left any specific instructions, we recommend dissolving your nutrients one by one, mixing thoroughly. Then, you’re going to need to let it sit for a few minutes in order for the pH to balance out. This way you can measure and adjust accordingly without any fluctuations.
What is pH?
pH is used to measure acidity and alkalinity of a liquid or dissolved solid. pH levels can range from anywhere between 0.0 and 14.0; substances with a pH lower than 7 are considered acidic, whereas those with a pH higher than 7 are considered more alkaline. If the solution is exactly 7.0, it’s pH neutral. A great example of an acidic substance is hydrochloric acid, which has a pH of 0.0, whereas caustic soda (washing soda) is highly alkaline, with a pH of 14.0. Water is the best example of neutral substances, as it tends to sit at around 7.0 pH.
For a cannabis plant to grow to the best of its abilities, you need to keep in mind that pH levels shouldn’t always be exactly the same; depending on the strain grown, the stage in which it is in (germination, growth, pre-flower, bloom), the growth medium and whether you’re growing organically or using minerals, the pH level of your water should vary slightly.
We hope these tips have been a helpful reminder of how to leverage pH tests in your grow.
Cannabis, like many plants, prefers slightly acidic soil conditions. It tolerates a wide pH range (5.0-7.0) without symptoms of bronzing or interveinal chlorosis (yellowing of top leaves), but pH levels outside of the optimal range of 5.8 – 6.2 will limit growth. To maintain optimal pH levels, cultivators should test pH levels every two days, and adjust the pH as needed.
On the pH scale, values less than 7.0 indicate acidity; values greater than 7.0 indicate alkalinity. Deionized water has a neutral pH of 7.0. The pH scale is a logarithmic function, so even small changes in pH values are significant. For example, a pH level of 4.0 is ten times as acidic as a pH level of 5.0. For plants, pH is important because it affects the form of the nutrients in the substrate.
The pH scale — which ranges from zero to 14.0 — provides insight into how chemical compounds will interact with one another based on their ionic state. It is good to remember, pH reflects the concentration of hydrogen ions in a solution. More intuitively however, pH from a practical sense can be understood in terms of acids (vinegar, ammoniacal nitrogen) and alkaline bases (baking soda, potassium bicarbonate).
05 Mar Best Practices for Monitoring pH for Cannabis
For example, when pH is low, the solubility of some micronutrients like iron and manganese increases, making them more available to plants. This can cause toxicity. However, when pH increases, micronutrients, along with phosphorus, become less soluble and less available to plants.
Best Practices for Monitoring pH for Cannabis
Caption: Nutrient availability increases or decreases in response to pH. A pH level of 5.8 – 6.2 is appropriate for cannabis.
Editor’s note: Balancing pH is a critical component to ensuring nutrient solubility and uptake for cannabis. As part of the upcoming release of the Fluence Cannabis Cultivation guide (available later this month), we are releasing tips on how to measure and monitor pH to ensure your fertigation strategy is not a limiting factor to your use of high-intensity LED lighting.
Testing pH is easy. Combination pH/EC meters are relatively inexpensive and require little training to use. They offer a permanent solution to disposable pH test strips and dye kits, which are cumbersome and must be subjectively interpreted by the color of the reactive test material.