I would be very suprised if there is any difference in the manufacture of each granular type. It is possible the P granules are manufactured / processed to be better soluable in water than the lawn type, but I doubt it. Some lawn fertilizers now have slow release features. Someone should contact a salesperson for a fertilizer company that produces both types. In the olden days (20yrs ago) fish hatcheries standardly used ag fertilizer to nutrify their ponds. Liquid fertilizers are popular today at hatcheries to get quick and efficient nutrient release and distribution.
Last edited by Bill Cody; 03/17/10 09:05 PM.
