Growers 16-4-8 Pasture Safe Fertilizer - 500 Lbs. $700.00 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart Description Description Growers Pasture Safe 16-4-8 Fertilizer Pasture-safe fertilizer. Apply to established pasture. Best time to fertilize is spring and fall. Rate of use: 50 Lbs. per 10,000 square feet, or 200 Lbs. per acre.