How Much Do I Use

• The amount of fertilizer to apply to established lawns is based on the nitrogen level.
• The recommended amount of nitrogen to apply for Western Washington is 4-6 pounds of “actual nitrogen” per 1000 sq. ft. of lawn area per year.
• Fertilizer should be applied 4-6 times per year, with each application providing approximately 1 lb of “actual nitrogen” per 1000 sq. ft.
• The nutrients on a bag of fertilizer are expressed as a true percentage by weight.

Example: 28-7-14 contains 28% of N, 7% of P, and 14% of K. This means that every 100 lbs of 28-7-14 contains 28% or 28 lbs of nitrogen (N), 7 lbs of phosphorous (P), and 14 lbs of potassium (K). (i.e. 100 lb x .28 (28% expressed as a decimal) = 28 lbs).

Therefore, we need to apply 3.5 lbs of 28-7-14 fertilizer to get 1 lb of nitrogen on our 1000 sq. ft. lawn.