Given below are two statements: Statement I: Soil reaction explains the concentration of hydrogen ions (H⁺) in soil and is described as pH. The pH scale runs from 0 to 14. Statement II: A pH of 7 is neutral, less than 7 is acidic and greater than 7 to 14 is basic or alkaline.

Correct option is A

The correct answer is (A) Both Statement I and Statement II are correct

Explanation:
• Statement I is correct: Soil pH is a measure of the acidity or alkalinity of the soil, which is determined by the concentration of hydrogen ions (H+). The logarithmic scale used for this measurement ranges from 0 to 14.
• Statement II is correct: The scale is centered at 7 (neutral). Values below 7 indicate acidity (higher H+ concentration), and values above 7 indicate alkalinity or basicity (lower H+ concentration).

Information Booster:
• Soil pH is critical because it affects the availability of nutrients to plants. For example, phosphorus is most available in the pH range of 6.0 to 7.5.
• Most agricultural crops grow best in slightly acidic to neutral soils (pH 6.0 to 7.0).

Additional Knowledge:
• Extreme soil pH (below 4.5 or above 9.0) can lead to toxicities of certain elements like aluminum or deficiencies of essential nutrients.
• Lime is often added to acidic soils to raise the pH, while sulfur or gypsum may be used to manage alkaline soils.