K-RichHigh analysis pH buffered liquid potassium complexed with citric acid. Problems with potassium uptake are often pH related, due to the inherent alkalinity of this element. K Rich involves potassium citrate a buffered, super available form of potassium. Specifically designed for foliar fertilising fruit, vegetable and grain crops during the potassium hungry fruit seed fill stage. Growth Stage Vegetative Growth Pre flower, Flowering, Fruit Set & Fill