Limestone recommendations are made based on the pH goal and the amount of exchangeable acidity measured by the Mehlich Buffer soil test.
The pH goal varies with the turf use and grass species. The pH goal is given on the individual sheet for each turf use listed in this handbook. If the soil pH is already at or above the pH goal, no limestone is recommended. If the soil pH is below the pH goal, look in the left hand column and find the acidity as reported on the bottom of the soil test report then go across to the appropriate "pH Goal" column to determine the limestone recommendation. The recommendations are given as pounds of calcium carbonate equivalent (CCE) per 1000 square feet. If the limestone to be used is significantly different from 100% CCE, the recommendation must be adjusted for this difference.
Acidity (meq/100 g) |
pH Goal 7.0 | pH Goal 6.5 | pH Goal 6.0 |
---|---|---|---|
2.0 | 50 | 50 | 50 |
2.6 | 70 | 50 | 50 |
3.3 | 70 | 50 | 50 |
3.9 | 90 | 70 | 50 |
4.6 | 110 | 70 | 50 |
5.2 | 110 | 90 | 50 |
5.8 | 140 | 90 | 50 |
6.5 | 160 | 110 | 70 |
7.1 | 160 | 110 | 90 |
7.8 | 180 | 140 | 90 |
8.4 | 180 | 140 | 110 |
9.0 | 210 | 160 | 110 |
9.7 | 230 | 180 | 140 |
10.3 | 230 | 180 | 140 |
11.0 | 250 | 210 | 160 |
11.6 | 280 | 210 | 160 |
12.3 | 280 | 230 | 180 |
12.9 | 300 | 250 | 180 |
13.5 | 320 | 250 | 210 |
14.2 | 320 | 280 | 210 |
14.8 | 340 | 280 | 230 |
15.5 | 370 | 300 | 230 |
16.1 | 370 | 320 | 250 |
16.8 | 390 | 320 | 250 |
17.4 | 390 | 340 | 280 |
18.0 | 410 | 340 | 280 |
18.7 | 440 | 370 | 300 |
19.3 | 440 | 390 | 300 |
20.0 | 460 | 390 | 320 |
20.6 | 480 | 410 | 320 |
21.2 | 480 | 410 | 340 |
21.9 | 510 | 460 | 340 |
22.5 | 530 | 460 | 370 |
23.2 | 530 | 460 | 370 |
23.8 | 550 | 480 | 390 |
24.5 | 570 | 480 | 390 |
25.1 | 570 | 510 | 410 |
25.7 | 600 | 530 | 410 |
Ag Analytical Services Lab
Hours: Monday-Friday, 8:00 AM - 4:00 PM
- Email aaslab@psu.edu
- Office 814-863-0841
- Fax 814-863-4540
Ag Analytical Services Lab
Hours: Monday-Friday, 8:00 AM - 4:00 PM
- Email aaslab@psu.edu
- Office 814-863-0841
- Fax 814-863-4540