I have bought a commercially produced product with NO application instructions on the bottle. As all my seedlings are still in the unheated greenhouse (and in their first cups), they get a rather diluted "drink" weekly, one teaspoon per 10 liters. It works very well for me. I even give tiny, weak seedlings in the seed tray this kind of solution to push them - gives them power to grow!
I've never used it outside, because it's hard to get here, but there are other fertilizers that do very fine.
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