What You Need to Know About Fertilizing and Watering - Southwest ...

Insert D. Pounds of fertilizer to apply if the percent of nitrogen in
slow-release/slowly available form is 35% or more
Percent Nitrogen in the Fertilizer
Square Feet of Area to be Fertilized
500 1,000 1,500 2,000 2,500 3,000 3,500 4,000 4,500 5,000 5,500 6,000 6,500 7,000 7,500 8,000
2% 25 50 75 100 125 150 175 200 225 250 275 300 325 350 375 400
6% 8 17 25 33 42 50 58 67 75 83 92 100 108 117 125 133
8% 6 13 19 25 31 38 44 50 56 63 69 75 81 88 94 100
10% 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
11% 5 9 14 18 23 27 32 36 41 45 50 55 59 64 68 73
12% 4 8 13 17 21 25 29 33 38 42 46 50 54 58 63 67
14% 4 7 11 14 18 21 25 29 32 36 39 43 46 50 54 57
15% 3 7 10 13 17 20 23 27 30 33 37 40 43 47 50 53
16% 3 6 9 13 16 19 22 25 28 31 34 38 41 44 47 50
17% 3 6 9 12 15 18 21 24 26 29 32 35 38 41 44 47
18% 3 6 8 11 14 17 19 22 25 28 31 33 36 39 42 44
20% 3 5 8 10 13 15 18 20 23 25 28 30 33 35 38 40
22% 2 5 7 9 11 14 16 18 20 23 25 27 30 32 34 36
24% 2 4 6 8 10 13 15 17 19 21 23 25 27 29 31 33
26% 2 4 6 8 10 12 13 15 17 19 21 23 25 27 29 31
28% 2 4 5 7 9 11 13 14 16 18 20 21 23 25 27 29
30% 2 3 5 7 8 10 12 13 15 17 18 20 22 23 25 27
32% 2 3 5 6 8 9 11 13 14 16 17 19 20 22 23 25
36% 1 3 4 6 7 8 10 11 13 14 15 17 18 19 21 22
38% 1 3 4 5 7 8 9 11 12 13 14 16 17 18 20 21
40% 1 3 4 5 6 8 9 10 11 13 14 15 16 18 19 20
Example: You bought a bag of 16-4-8 fertilizer. The area of your lawn you are going to fertilize is 5,000 square feet.
So you need to apply 31 pounds of the fertilizer you bought to cover your lawn.
If your lawn size is not provided in the table, you can calculate the amount as follows:
You bought a bag of 16-4-8 fertilizer. The area of your lawn you are going to fertilize is 2,250 square feet (not shown in table).
Add the value for 2,000 square feet (13) and 2,500 square feet (16) and divide by two (to average the table values):
( 13 + 16 ) ÷ 2 = 14.5 pounds of fertilizer to apply to your lawn.