How many square feet does a 50 pound bag of fertilizer cover?
Now that you know 3.8 lb of 26-5-10 fertilizer will cover 1000 sq ft, determine how many times 3.8 lb goes into 50 lb. 50 lb ÷ 3.8 lb = 13.2. Now multiply 13.2 by 1000 sq ft: 13.2 × 1000 sq ft = 13,200 sq ft. Thus, a 50-lb bag of 26-5-10 covers 13,200 sq ft at a rate of 1.0 lb nitrogen per 1000 sq ft.
How to calculate a fertilizer ratio. If your soil test report recommends applying 1.5 lb of nitrogen, 0.5 lb of phosphate, and 0.5 lb of potash per 1000 sq ft, you should apply a fertilizer with a ratio of 3-1-1 since you need three times as much nitrogen as phosphate and three times as much nitrogen as potash.
- Calculating Fertilizer Rates from Nutrient Recommendations. Soil test recommendations are given in lb/ac or kg/ha of nutrients. To determine the fertilizer rate for a particular nutrient, multiply the rate of the desired nutrient by 100 and divide by the percentage of the nutrient in the fertilizer.
- Fertilizer grade is an expression referring to the legal guarantee of the available plant nutrients expressed as a percentage by weight in a fertilizer, e.g. a 12-32-16 grade of NPK complex fertilizer indicates the presence of 12 % nitrogen (N), 32 % phosphorous (P2O5) and 16 % potash (K2O).
- Chemi- cal compatibility of liquid fertilizers is important to prevent precipitation or “salting out” of incompatible materials. This publication covers the use of inorganic fertiliz- ers, sometimes referred to as commercial or chemical fertilizer, to supply the major crop nutrients N, P2O5, and K2O.
(2) Amount of product needed to apply 43.5 pounds of nitrogen per acre. To determine the amount of product needed to deliver 1 pound of nitrogen per thousand square feet, divide 100 by the first number in the fertilizer ratio. For example, for 16-4-8 fertilizer, divide 100 by 16.
- Start fertilizing your container plants twice a week. Fertilize your houseplants once a week. Feed the plants in your garden every two to three weeks. Fertilize your landscape plants once a month.
- Seeding rates for tall fescue lawns are between 5-10 pounds seeded at 1000 square feet and between 220-435 pounds seeded per acre. Pasture seeding rates for tall fescue grass are generally around 15-30 pounds per acre.
- (2) Amount of product needed to apply 43.5 pounds of nitrogen per acre. To determine the amount of product needed to deliver 1 pound of nitrogen per thousand square feet, divide 100 by the first number in the fertilizer ratio. For example, for 16-4-8 fertilizer, divide 100 by 16.
Application. Specialists at the University of Minnesota recommend applying urea at a rate of 10 pounds per acre at planting time when conditions are moist and at a rate of 20 pounds per acre when conditions are dry.
- Starter fertilizer is a small quantity of fertilizer nutrients applied in close proximity to the seed at planting. Starter fertilizers enhance the development of emerging seedlings by supplying essential nutrients in accessible locations near the roots.
- Actual Nitrogen Costs
Product N content N Cost for 175lb/acre Anhydrous 82% $84.00 Urea 45% $99.75 UAN32 32% $106.75
- The first number is the amount of nitrogen (N), the second number is the amount of phosphate (P2O5) and the third number is the amount of potash (K2O). These three numbers represent the primary nutrients (nitrogen(N) - phosphorus(P) - potassium(K)). This label, known as the fertilizer grade, is a national standard.
Updated: 3rd October 2019