This formula operates very well for many vegetable gardens as long as your soil is in superior issue, to start with. When you've got an excessive amount P or K with your garden based on the soil test, cut out the bone meal (P) or feather meal (K) as necessary. https://npkfertilizer15-15-1558919.sharebyblog.com/29572067/fascination-about-npk-20-20-15-là-gì