Nutrients Part 2: Empowering Commercial Growers with the Science Behind Calcium and Potassium



Growing cannabis is a combination of craft and science. It is about discovering the attributes of each plant, and bringing out their full genetic potential. Last week, we discussed two key nutrients, nitrogen and phosphorus, that play a critical role in this journey. However, these nutrients are only a part of the plant physiology puzzle. In this post, we are going to discuss Potassium (K), the third macronutrient of the NPK group, and a supporting player, Calcium whose potential is still being explored.


Potassium (K)


Potassium is the ultimate multitasker. This vital mineral plays a critical role in each of the plant’s growth stages. According to researcher Mark June Wells, an adequate amount of potassium is essential for healthy cannabis production, as this mobile mineral makes sure that micronutrients (Calcium, Iron, Magnesium) and water are transported throughout the plant. This is why the majority of potassium can be found in the root cells of the plant, basically, staying alert for minerals and water so that it can move them where they need to go.


Here are just a few additional tasks that this workhorse takes on:


  • Help synthesis proteins from DNA to messenger RNA

  • Transports water and nutrients throughout the plants

  • Helps the plant generate enough energy so that each cell gets exactly what it needs to get the job done

  • Increases the plant’s resiliency during periods of drought

  • Helps build the cell walls of the plant, increasing both the strength and consistency of these plant tissues

  • Increase the weight, density, and volume of cannabis buds.


Put it to the test:


In a research study conducted by Ahmad and Anjum, they investigated the role that potassium plays in helping combat stress from drought. It was discovered that this nutrient aids in opening and closing the stomata of the cell, osmotic adjustment, and enzyme activation.


Basically, potassium is the part of the plant structure that helps to optimize the physiological and biochemical processes in the plant.


It also plays a critical role in photosynthesis by opening up the stomata in the cells, so that carbon dioxide in the environment can be captured.



The Takeaway: