By Donald Stotts  STILLWATER, Okla. – Ongoing Oklahoma State University research into soil pH is providing insights for wheat producers looking at planting cotton in their crop rotation.  Many producers already recognized that the lack of agricultural liming in traditional wheat fields could be a challenge with growing cotton, but specifics as to how different soil pH levels might affect the second crop’s performance was an unknown factor, said Brian Arnall, OSU Extension precision crop…