I'm not following the help you guys gave. Are you saying that kleingrass and lovegrass will take more out of the soil than can be fertilized back in?
Here's what I've read about kleingrass
Kleingrass is extremely attractive to cattle and wildlife as either green forage or cured hay. Because of good palatability, protect from overgrazing until the field is established. Animal performance has been above average for a warm season, perennial grass. Horses and sheep should not graze Kleingrass as health side-effects may result.
And this about lovegrass
SAND LOVEGRASS is an important warm-season bunchgrass that grows on sandy soils of the central and southern Great Plains. SAND LOVEGRASS is a palatable and nutritious rangegrass, with a deep root system and has good drought resistance, but lacks persistance under heavy grazing.
The location is sandy semiarid South Texas. If these are the wrong product, what is the right product? Obviously there is nothing they can do about getting a different product right now. What should they do with what they have? And I don't understand why horse people would be the market when there are so few horses and so many cattle. Are you saying that horse people will spend the money on hay and cattle people won't? I see a lot of rolls of hay in cattle fields?