IAHP - International Association of HydroSeeding Professionals

Soil Acidity

*How to Increase* Soil pH - pounds of limestone/1000 sq ft**
Sq. Feet	Sandy soil	Loam Soil	Clay Soil
Present pH	to pH 6.5	to pH 6.5	to pH 6.5
4.8	85	140	200
4.9	80	130	185
5.0	75	128	175
5.1	70	115	160
5.2	65	110	150
5.3	60	100	135
5.4	55	95	125
5.5	50	85	110
5.6	45	80	100
5.7	40	70	90
5.8	35	65	80
5.9	30	55	70
60	25	50	60
6.1	20	40	50
6.2	15	35	40
6.3	10	25	30
6.4	5	15	20

*How to decrease* Soil pH - pounds of limestone/1000 sq ft**
Current pH	Target pH	Using Sulfur	Using Alum sulfate
8.0	6.5	20	40
	6.0	30	60
	5.5	40	80
	5.0	50	100
7.5	6.5	12.5	25
	6	25	50
	5.5	35	70
	5.0	45	90
7.0	6.0	12.5	25
	5.5		50
	5.0		70
6.0	5.0	20	40
5.5	5.0	10	20