Discussion
The maximum soil fertility occurs in the pH range of
Answer: B
Soil fertility is greatest in the slightly acid to neutral range, about pH 6.0 to 7.2. In this band nitrogen, phosphorus, potassium and the micronutrients are all reasonably soluble at once, and soil bacteria are most active.
Below about pH 5.5 aluminium and manganese become toxic and phosphorus is locked up; above pH 8 iron, zinc and manganese become unavailable.
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