Cooper's 29.05.10 Slow release Fertilizer with Iron and trace elements. Great Lawn Starter. Slow Release Derived From Polymer Coated Sulfur Coated which give you a slow even green for up to three months. All the Fertilizer your lawn needs for up to 3 Months.

What does fertilizer "analysis" mean?

All fertilizers have three numbers on the label which indicate the fertilizer analysis, or "percentage by weight" of nitrogen, phosphorus and potassium, in that order.

Therefore, a 50 pound bag of fertilizer labeled 20-10-5 would contain 20% nitrogen (10 pounds), 10% available phosphates (5 pounds), and 5% soluble potash (2.5 pounds).
See the calculations below:

50 pound bag of 20-10-5 fertilizer:
20% nitrogen (.20 x 50 lbs = 10 lbs)
10% available phosphates (.10 x 50 lbs = 5 lbs)
5% water soluble potash (.05 x 50 lbs = 2.5 lbs)

50 LB. Bag