धूपे बरोबर खालीलपैकी कोणते मुख्य अन्नद्रव्य जास्त प्रमाणात निघून जाते ?

The correct answer is Option C (Phosphorous).

Key Points:
• Soil Erosion and Nutrient Loss:
• Topsoil is the most fertile layer containing organic matter and essential plant macronutrients (N, P, K).
• Phosphorus Loss Dynamics: Unlike nitrogen (which is primarily lost through leaching and volatilization), phosphorus is strongly bound to fine clay particles and organic matter in the surface layer.
• When topsoil erosion takes place through surface runoff or wind action, the particulate-bound phosphorus is eroded and transported away in large quantities along with the sediment.
• Agricultural Impact: Phosphorus loss causes severe soil degradation, reduced fertility, and eutrophication in receiving aquatic water bodies.
• Control Measures: Adoption of contour bunding, cover cropping, minimum tillage, and mulching helps significantly minimize the loss of phosphorus-rich topsoil.
• Key Takeaway: Phosphorus is the primary macronutrient lost heavily via particulate soil erosion.