I am sure somebody has tried this before....I have been taking granular ferts (like Tomato Tone) and putting about a half cup into a quart of water. I let it sit for a day or two. Then I shake it up, pour the slurry around my plants and water them in. So far the results have been good. It seems to me the advantage is: I get the product down to the root zone quicker and in a formula that is more readily available to the plant. It is just my little experiment...nothing scientific or anything. Have you tried this? Ideas?
