Question

The physical environment of soil does not include:

• A. Soil air
• B. Soil water
• C. Concentration of nutrients (minerals)
• D. Soil temperature

Hint:

Physical properties: Texture, Structure, Density, Temperature, Air, Water.
Chemical properties: pH, CEC, Nutrient concentration, Salinity.
Keep this distinction in mind for soil science questions.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks to identify which of the given factors is not a part of the "physical" environment of the soil. Soil components can be classified as physical, chemical, or biological.

Step 2: Detailed Explanation:

• The physical environment of the soil refers to properties related to the state of matter, structure, and thermodynamics of the soil system.

• Soil air (A) refers to the gaseous phase in soil pores, which is a physical component essential for root respiration.

• Soil water (B) refers to the liquid phase, held physically within pores by capillary and matric forces.

• Soil temperature (D) is a physical property representing the thermal state of the soil, which affects biological activity and evaporation rates.

• Concentration of nutrients or minerals (C) refers to the chemical composition and ion availability in the soil. This is considered a chemical environment/property rather than a purely physical one.

• While minerals are physical particles, the "concentration of nutrients" specifically addresses the chemical fertility and saline/alkaline nature of the soil solution.

Step 3: Final Answer: Concentration of nutrients is a chemical property, hence it is the correct choice as it is not part of the physical environment.