Increase/decrease Soil Ph Chart
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1HOW TO INCREASE SOIL pH
AMOUNT OF LIMESTONE REQUIRED PER 1,000 SQ. FT.
SAND
LOAM
CLAY
Present
to pH
to pH
to pH
to pH
to pH
to pH
pH
6.0
6.5
6.0
6.5
6.0
6.5
4.8
60
85
100
140
140
200
4.9
55
80
95
130
125
185
5.0
50
75
85
125
115
175
5.1
45
70
80
115
100
160
5.2
40
65
70
110
90
150
5.3
35
60
65
100
75
135
5.4
30
55
55
95
65
125
5.5
25
50
50
85
55
110
5.6
20
45
40
80
45
100
5.7
15
40
30
70
35
90
5.8
10
35
20
65
25
80
5.9
5
30
10
55
15
70
6.0
25
50
60
6.1
20
40
50
6.2
15
35
40
6.3
10
25
30
6.4
5
15
20
If hydrated lime is preferred, use three-fourths the above amounts.
Pounds of Finely-Ground Limestone Required to Correct Soil Acidity
Soil Reaction Pounds of Limestone per 1000 S. Ft. of Lawn Area
Light Sandy
Medium Sandy
Loams/Silt
pH
Condition
Soils
Soils
Loams
Clay Loams
4.0
Excessively acid
90
120
165
200
4.5
Very Strongly Acid
80
105
150
180
5.0
Strongly Acid
70
90
120
150
5.5
Moderately acid
45
60
90
120
6.0
Slightly acid
25
30
45
60
HOW TO DECREASE SOIL pH
To Change
Alum.
To Change
Alum.
Sulphur
Sulphur
Soil Reaction
Sulphate
Soil Reaction
Sulphate
Pounds per
Pounds per
From pH
To pH
From pH
To pH
1,000 sq. ft.
1,000 sq. ft.
8.0
6.5
20
40
7.0
6.0
12.5
25
6.0
30
60
5.5
50
5.5
40
80
5.0
70
5.0
50
100
6.5
5.5
17.5
35
7.5
6.5
12.5
25
5.0
30
60
6.0
25
50
6.0
5.0
20
40
5.5
35
70
5.0
45
90
5.5
5.0
10
20
Apply finely powdered sulphur or aluminum sulphate at approximately the above rates on a loam soil. For silt
loams, use about one-third more than above. For sandy loams, use about one-half the above amounts.
Please keep in mind there are precautions that need to be taken in applying lime and sulfur. It is best recommended
to follow soil test recommendations when making applications. Also, the attempt to raise and/or lower pH over a
considerable range in a short period of time can result in phytotoxicity to some plants. Organic matter content and
the cation exchange capacity can result in modification to the above rates.
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