The Importance of Soil and Soil Media pH
How Soil pH Affects Availability of Plant Nutrients
Very Slightly Acid
Very Slightly Alkaline
Medium Acid
Slightly Acid
Slightly Alkaline
Medium Alkaline
Strongly Acid
Strongly Alkaline
NITROGEN
PHOSPHORUS
POTASSIUM
SULFUR
CALCIUM
MAGNESIUM
IRON
MANGANESE
BORON
COPPER & ZINC
MOLYBDENUM
pH
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
How Soil-less Media pH Affects the Availability of Plant Nutrients
Strong Alkalinity
Extreme Acidity
Strong Acidity
Slight Acidity
NITROGEN
PHOSPHORUS
POTASSIUM
SULFUR
CALCIUM
MAGNESIUM
IRON
MANGANESE
BORON
COPPER & ZINC
MOLYBDENUM
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
17 CAUTION: Do not apply any Harrell’s MAX® liquid foliar products on crops above 90°F or with urea or ammonium under cover or in a covered/closed greenhouse.
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