This formula works very well for some vegetable gardens provided that your soil is in superior situation, to start with. When you have an excessive amount of P or K in your yard based on the soil test, cut out the bone meal (P) or feather food (K) as desired. https://waylonsqkcu.ttblogs.com/9174157/helping-the-others-realize-the-advantages-of-npk-15-15-15-vietnam-unit