Phosphorus is linked to a plant’s ability to use and store energy, including the process of photosynthesis. It also helps plants grow and develop normally. It is beneficial for “Bulking Up” plants, such as fruit and flower growth, and creating bushy leaves and sturdy roots. It helps a plant convert other nutrients into usable building blocks with which to grow. How To Identify Phosphorus Deficiency in the Soil? If your plants are small, are producing little or no flowers, have weak root systems or a bright green or purplish cast, you have a phosphorus deficiency. Dosage : Take 2 - 3 ml for every 1 Litre Water