Question: I have eight raised beds (8′ by 4′) and all have above optimum levels for phosphorus (79.1), calcium (79.3), boron (1.5), manganese (11) and zinc (98) according to my last soil test. What I want to know is how to lower these nutrients and micronutrients to optimum levels? Answer: Caragh B. Fitzgerald, Associate Extension read more How to lower nutrients in the soil to optimum levels?