Evaluating Statements on Soil pH and Plant Growth

This solution analyzes two statements regarding the importance of soil pH for plants and farming practices.

Statement A Analysis: Plants require specific soil pH for proper growth.

This statement is correct. Different plants thrive within specific soil pH ranges. The pH level affects:

• Nutrient Availability: Soil pH influences how well essential nutrients (like nitrogen, phosphorus, potassium) dissolve and become available for plant roots to absorb.
• Microbial Activity: Soil microorganisms, crucial for nutrient cycling, function optimally within certain pH ranges.
• Toxicity: Extreme pH levels can lead to the buildup of toxic elements (like aluminum in acidic soils) or hinder the uptake of beneficial ones.

For example, blueberries prefer acidic soil (pH 4.5-5.5), while alfalfa grows best in slightly alkaline conditions (pH 7.0-7.5).

Statement B Analysis: Farmers use pH values to decide the type of fertiliser to add.

This statement is also correct. Farmers monitor soil pH to:

• Optimize Nutrient Uptake: By adjusting pH towards the optimal range for their crops, farmers ensure that applied fertilizers release nutrients effectively.
• Select Appropriate Fertilizers: If the soil is too acidic, liming (adding calcium carbonate) might be needed. If too alkaline, sulfur or acidic fertilizers might be considered. The pH influences which specific fertilizer types and application rates are most beneficial.
• Prevent Nutrient Imbalances: Understanding soil pH helps avoid over-application or ineffective application of fertilizers, preventing waste and potential environmental issues.

Conclusion

Since both Statement A and Statement B accurately describe the relationship between soil pH, plant growth, and agricultural practices, the correct option is that both statements are correct.