Combined iron sulfate and elemental sulfur requirements for the treatment of individual trees and shrubs by the soil application method.*
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Trunk diameter (inches)
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Number of 1 to 2 inch diameter holes made in soil within the drip line
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Pounds of combined elemental sulfur and iron sulfate
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||
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1
|
4
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0.5 - 1.0
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||
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2
|
6
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1 - 2
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||
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4
|
8
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3 - 6
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||
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6
|
12
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8 - 12
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||
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8
|
16 - 24
|
12 - 16
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|
10
|
25 - 30
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16 - 20
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||
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15
|
30 - 40
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20 - 30
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20
|
40 - 50
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30 - 40
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* Holes should be 12 -18 inches deep.
Updated 7/15/02