Compost tea is really good for lawns too, apply once a month, minimum 6 times a year for good results though. I put alfalfa in it when I did this and it made a thick lawn of fine grass so the blades weren't so coarse, wasn't dark forest green but it also helped the grass flower earlier and spread more. When I made it, I would put about 5 kgs of compost or composted manure and 5-10KG or alfalfa along with molasses. You can add kelp if you like but not entirely necessary either. I would also leave the water sit for about 24 hours to get the chlorine out, you can leave it over night with the fish tank bubblers and it gets it out pretty good as well especially when it's warm out.