One more thing for John to try (or tell me you've already tried) is beneficial nematodes. If you've already filled your soil with nematodes and all the other stuff, then I'm ready to punt and call in the soil test gods. The best soil tester in Texas is Texas Plant and Soil Labs.
For Bennie, we talk about organic solutions here, so if you're hoping for a suggestion of which Scott's product to buy, you'll have to try another Internet forum. For now I'll assume you've seen the light and want an organic solution.
Note that John has tried everything I might suggest and is still having problems. Even if this was not an organic board, I would still send him to the soil lab before suggesting a chemical fertilizer. If he's done all the organic stuff and still has a problem, then something is wrong that is probably a mineral deficiency. Normally organic fertilizers replace minerals, too, but maybe he needs a stronger dose to rebalance his soil. Before I'll suggest a soil test for you, I'll suggest starting an organic program and see what happens. For starters, read the FAQ at the top of this forum. It will give you some background on how, why, and what we're doing.
After you've read that, eventually I'm going to suggest you get some greensand (glauconite) and apply that to the surface of your turf. I'm thinking you have a bound up iron problem. Glauconite will release the iron from the soil and allow the plants to get it. BUT FIRST, before you get the greensand, I'm going to strongly urge you to apply 1 cubic yard of compost per 1,000 square feet of turf. At the same time or the next day, apply 20 pounds of corn meal (or alfalfa, or soy or linseed) meal per 1,000 square feet of turf. Water all that in briefly just to make sure all the compost and meal is damp. Then water again in a week for about an hour or more. Repeat that watering weekly unless you get some rain. Then after three weeks see if your grass is not greened up. When you notice that it still looks just as yellow as before, then hit it with the greensand. The green sand can go on at about 40 pounds per 1,000 square feet. That's kind of expensive but it lasts for about 5 years or longer.
Good luck and let us know how it goes!
_________________ David Hall Moderator Dirt Doctor Lawns Forum
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