Wakina, I do believe what he was referring to when he said "loosing 10s of thousands of acres of crp ground" was Conservation reserve program lands "crp grass lands", also called filter strips, and or riparian buffers, basically a lot of contracts between the farmers and the conservation program have been up within the last 10-15 years resulting in "10s of thousands of acres" returned to crop producing lands. All of those grasses and buffer zones utilizes vegitation that consumes phosphorus and nitrogen etc.