Question

Which one of the following factors affecting crop production falls in the category of edaphic factors?

• A. Precipitation
• B. Soil organisms
• C. Atmospheric humidity
• D. Altitude

Hint:

The term 'edaphic' comes from the Greek word edaphos, meaning ground or soil. In agricultural exams, any factor related directly to soil properties (such as pH, texture, structure, moisture, or soil biology) is classified as edaphic.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Environmental factors that influence crop growth are categorized into climatic, edaphic, physiographic, and biotic factors.
Edaphic factors relate specifically to the physical, chemical, and biological properties of the soil environment.

Step 3: Detailed Explanation:
Let us analyze the classifications for each option:
- Precipitation and Atmospheric humidity are weather-related elements classified as climatic factors.
- Altitude refers to elevation above sea level, which is classified as a physiographic factor because of its indirect effects on temperature and pressure.
- Soil organisms (such as bacteria, fungi, earthworms, and nematodes) live within the soil matrix. They drive organic matter decomposition and nutrient cycling, making them a biological component of the soil. Therefore, they are classified as edaphic factors.

Step 4: Final Answer:
Soil organisms are classified as edaphic factors.