Microtek Organics NPK contains the three elements that are vital for the health and well-being of soil and plants. Nitrogen, an essential component of photosynthesis, regulates energy production. It is also a major component of amino acids which are the building blocks for proteins. Phosphorous assists in converting the nutrients of the plants and for all stages of cell production and renewal, making it necessary for growth. Potassium regulates the uptake of CO2 during photosynthesis, it triggers the activation of enzymes and is essential for ATP, as well as regulating water. NPK is a critical product for a healthy and plentiful crop. Not available in 2.5L.