Soil pH
Soil reaction, or pH, refers to the degree of acidity or alkalinity. A pH between 7.1 and 14 indicates an alkaline condition, a high pH value indicating a greater alkalinity. A pH less than 7.0 indicates acidity and the lower the pH the greater the acidity. Most nutrients are readily available in soils with a pH range of 6 to 7, with a decrease in availability at soil pH above or below this range. Strongly acid soils have low extractable calcium and magnesium, a high solubility of aluminium, iron, and boron, and a low solubility of molybdenum. At the other extreme are alkaline soils. Calcium, magnesium and molybdenum are abundant in these soils with little or on toxin aluminium. Phosphorous availability may be greatly reduced at both very low and very high pH values due to phosphate fixation.
Soil pHSoil reaction, or pH, refers to the degree of acidity or alkalinity. A pH between 7.1 and 14 indicates an alkaline condition, a high pH value indicating a greater alkalinity. A pH less than 7.0 indicates acidity and the lower the pH the greater the acidity. Most nutrients are readily available in soils with a pH range of 6 to 7, with a decrease in availability at soil pH above or below this range. Strongly acid soils have low extractable calcium and magnesium, a high solubility of aluminium, iron, and boron, and a low solubility of molybdenum. At the other extreme are alkaline soils. Calcium, magnesium and molybdenum are abundant in these soils with little or on toxin aluminium. Phosphorous availability may be greatly reduced at both very low and very high pH values due to phosphate fixation.
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