Certified Storm Water Operator Practice Exam

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What is the minimum soil pH for most grasses?

4.5

5.0

5.5

Most grasses thrive in soil conditions where the pH is between 5.5 and 7.0, which is considered slightly acidic to neutral. A minimum soil pH of 5.5 promotes optimal nutrient availability, which is crucial for healthy growth and development. At this pH level, essential nutrients such as nitrogen, phosphorus, and potassium are more readily available to the grass roots, resulting in robust growth and strong resistance to pests and diseases.

Soils with a pH lower than 5.5, such as those with 4.5 or 5.0, may lead to nutrient deficiencies and limitations in growth because high acidity can increase the solubility of harmful metals and decrease the availability of key nutrients. On the other hand, soil with a pH of 6.0 is still suitable for grass species, but it is below the minimum threshold necessary for most grass types to thrive optimally. Therefore, a minimum soil pH of 5.5 strikes an ideal balance that supports grass health and vitality.

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