Aint life grand, or more pointedly the processes of life. Like nitrogen and phosphorus potassium is essential to bio or photosynthesis. Today we’ll complete our look into the macro nutrients involved in fertilizer by finding out where potassium fits into the mix. Pure potassium is an alkali metal but it’s so reactive that you will never find it alone. In nature it occurs in the form of ionic salts and is part of many minerals. First found in potash (the ashes of plants) this is where it got its name.
If phosphorus is the power cord of life, potassium is the light bulb. ATP the mechanism behind bio or photosynthesis pumps 3 sodium ions into the cell while pushing 2 potassium ions out of the cell. This causes the cell membrane to acquire an electrochemical charge, the spark of life so to speak. This can be very complicated and technical stuff, we wanted to simplify the process so lay people (like ourselves) can understand the function of fertilizer.
The potassium found in Vermicast comes from the composted plant material that the worms eat, primarily in the form of chloride (KCl) and should come in between 0.5% to 2% of the total weight of the organic material. The really nice thing about Vermicast as fertilizer is the natural water solubility of the macro nutrients, it’s much easier for plants to absorb these fertilizers and they are slow release.