Had a few soil tests for my clients where Phosphorus was in the 11 lb/Acre range. They all have existing Tifway 419 that has not performed well. The root systems appear very shallow and fragile. I'd like to get this corrected, so here is my question. Using 18-46-0 Diammonium Phosphate, what would be the maximum to apply in a single application? If I examine my proposed nutrient schedule for 2005, 1 lb of P per 1,000 with this application wouldn't be enough. The N would also fall short in that application. If I could do 2 lbs of P per 1,000 for this single application, that would balance everything out by the end of the year. Subsequent applications in 2005 will have only minimal amounts of P. We have clay soils if that factors into the equation.