Phosphorous is essential for strong root systems and bright flowers. It can increase fruit development and seed yield. Sources of Phosphorous are Activated Sludge, Bloodmeal, Bone Meal, Cottonseed Meal, and Rock Phosphate.
Potassium is essential for cell division and strong stems.
It helps fight diseases, improves quality of fruit, and decreases water requirement of plants. For acid-loving plants, mix with equal parts of sand or soil. Rich and fine textured. Absorbs and holds N until plant can use it. Purifies the mixture.