https://www.cambium.pro/blog daily 0.75 2025-06-28 https://www.cambium.pro/blog/role-of-potassium-in-fruit-trees monthly 0.5 2025-06-28 https://images.squarespace-cdn.com/content/v1/655e3b9d5058b958626f30e4/f8f0434f-8c23-4d4f-8355-321ed2bbe3ee/Stoma_Open.jpg Weekly Tree Blog - Role of Potassium in Fruit Trees - Water regulation is primarily done through the opening an closing of stomata cells. Potassium plays a crucial role in this process through proton and potassium pumps. Blue light activates proton pumps that push out hydrogen (H+) ions out of the guard cells, the loss of positive ions activates potassium pumps to drive positively charged potassium ions into the guard cells to balance the electrochemical charges. As potassium ions move into the guard cells, water potential changes and water moves into the cells, causing them to swell. Due to their unique shape, the guard cells curve into an elongated “C” shape, causing an opening. As the cells transpire, based on various factors controlled by pH, temperature, water potential, red and blue light, Potassium serves as the regulation mechanism by which the cells open and close. 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