Turfgrass arn't getting enough p2o5 now. Most of the p2o5 is tied up in the soil, very inmobile. If properly applied, very little get into waterways.
Keep the k levels to 3-5%, and closer to 5% if turfgrass is underlot of stress.
5 lbs/acre of fe /yr is plenty
Apply a QUALITY FORTIFIED organic fert 2-3 /yr
Food for thought:
Up to the late 70's in N Ill we be applying ~ 7lbs/m/yr on putting greens, generally using fert containing uf. All of a sudden, the trend went to 3-4 lbs/m/yr....turf look great for several years, then started declining. Why?.....we had depleted the reserve. Net result, we increased the n applications a little
So, you guys weaning off one program and start another, wait several years to make a judgement
Place for liquid and spoon feeding, but in home lawns I believe it's excessive. Just used a quality fortified organic fertilizer
Help me Ric
Timothy J Murphy Specializing in Quality Turf
Bs in Plant and Soil Science
Almost 40 yrs exp., 20 as GC superintendent
Primarly work with cool season turf