Colonel K0rn said:
Matt Martin made a video where he was talking about the benefits of humic acid, and I've learned a LOT by sitting in his classes that he holds on YouTube.
I watched that vid and a couple of his others just last night. Nicely done.
I picked up a pound each of powdered humic acid, kelp, and yucca from Kelp4Less. It's about $18 bucks a pound, I think. Shipping isn't bad.
For my 2,500 SF, it'll last forever after mixing with water. I also add some molasses for the soil microbugs and SLES (shampoo, if you like) to lube up the soil.
You are right, the stuff stains pretty well but it comes off readily enough. I dilute my concentrated solution in 15 gallons applied with a Chapin 6005 hose-end sprayer such that the staining is less of a problem.
I usually spray every weekend as the upside is great with no risk of harm to the lawn. I'll omit the SLES after I get a nice, soft soil and apply at a maintenance rate once a month or so. The kelp, yucca, and humic will still go down once a week.
No noticeable results after only 3-4 applications but it makes me feel good... which is nice...
I think Matt Martin reports (might have been someone else) that since he's been using it, he is seeing earthworms just blanketing his driveway after it rains where in the past, it's been the usual worm here and there.
I have a couple of bare spots where I pulled out some shrubs. The soil there is bubbling... clumps of pea-sized soil are appearing. Maybe that usually happens and I never noticed because I've never been serious about soil and grass before. I like to think they are worm castings but I've never seen castings before, either.
For all I know, it's magma bubbling up from the earth's core. But then... I would be in a world of hurt.