Starter P Project Provides a Win-Win

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Jacobs, Eleanor
Conesus Lake Watershed Project , Phosphorus , Cornell University , USDA
The New York Starter Phosphorus Project was initiated to evaluate and demonstrate the value of P starter application on soils testing high or very high in soil P. Cornell University’s Nutrient Management Spear Program (NMSP) faculty and staff, PRO-DAIRY staff and Cornell Cooperative Extension educators worked together to conduct 65 on-farm and 13 research station trials between 2001 and 2003. The project was funded by a NESARE research and education grant (LNE02-173) and contributions from New York State Natural Resources Conservation Service, Agway, Carovail, Pioneer Hi-Bred International Inc., AgriCulver Seeds and the Northern New York Agricultural Development Program. Based on the results of these three years, we conclude that on sites that test high in P and have no manure applications planned for the season, no yield penalty is expected when P starter levels are reduced below 25 lbs P2O5 per acre. On sites that test very high in P or when manure is applied to high testing sites, there is a low probability of a starter P response, and P could be eliminated from the starter without a yield or silage quality penalty.
Posted with permission from Cornell University Cooperative Extension.