Question:
Which of the following practice does NOT contribute to in-situ moisture conservation?
Which of the following practice does NOT contribute to in-situ moisture conservation?
Show Hint
Moisture conservation usually involves "covering" the soil.
Look for words that describe a "layer" or "barrier."
Weeding is "cleaning," whereas mulching is "covering."
Look for words that describe a "layer" or "barrier."
Weeding is "cleaning," whereas mulching is "covering."
Updated On: Aug 21, 2026
- Live mulching
- Straw mulching
- Plastic mulching
- Weeding
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify which agricultural practice is not primarily classified as an "in-situ moisture conservation" technique.
In-situ conservation refers to retaining moisture within the soil profile exactly where it falls.
Detailed Explanation:
• Analysis of Mulching:
Mulching is the process of covering the soil surface with a layer of material.
Live mulching: Growing a low-spreading crop (like legumes) between rows of the main crop. It shades the soil and reduces evaporation.
Straw mulching: Using crop residues like wheat or rice straw to cover the ground. This reflects solar radiation and reduces surface temperature.
Plastic mulching: Using synthetic films to create a vapor barrier, preventing moisture from leaving the soil surface.
All three are classic in-situ moisture conservation techniques that create a physical barrier between the soil and the atmosphere.
• Analysis of Weeding:
Weeding is the removal of unwanted plants (weeds) from the field.
While weeding indirectly saves moisture by preventing weeds from transpiring and competing with the main crop for water, it is fundamentally a "crop management" or "inter-culture" practice.
Unlike mulching, weeding does not create a protective layer over the soil to prevent evaporation directly from the soil surface.
In fact, manual weeding often involves disturbing the soil surface, which can temporarily increase evaporation from the top layer.
• Scientific Perspective:
Conservation practices focus on reducing "E" (Soil Evaporation) in the ET (Evapotranspiration) equation. Mulches do this.
Weeding focuses on reducing "T" (Transpiration by non-target plants).
Step 2: Final Answer:
Live mulching, straw mulching, and plastic mulching are direct physical methods of in-situ moisture conservation.
Weeding is an agronomic management practice and does not contribute to in-situ conservation in the same structural sense.
The question asks to identify which agricultural practice is not primarily classified as an "in-situ moisture conservation" technique.
In-situ conservation refers to retaining moisture within the soil profile exactly where it falls.
Detailed Explanation:
• Analysis of Mulching:
Mulching is the process of covering the soil surface with a layer of material.
Live mulching: Growing a low-spreading crop (like legumes) between rows of the main crop. It shades the soil and reduces evaporation.
Straw mulching: Using crop residues like wheat or rice straw to cover the ground. This reflects solar radiation and reduces surface temperature.
Plastic mulching: Using synthetic films to create a vapor barrier, preventing moisture from leaving the soil surface.
All three are classic in-situ moisture conservation techniques that create a physical barrier between the soil and the atmosphere.
• Analysis of Weeding:
Weeding is the removal of unwanted plants (weeds) from the field.
While weeding indirectly saves moisture by preventing weeds from transpiring and competing with the main crop for water, it is fundamentally a "crop management" or "inter-culture" practice.
Unlike mulching, weeding does not create a protective layer over the soil to prevent evaporation directly from the soil surface.
In fact, manual weeding often involves disturbing the soil surface, which can temporarily increase evaporation from the top layer.
• Scientific Perspective:
Conservation practices focus on reducing "E" (Soil Evaporation) in the ET (Evapotranspiration) equation. Mulches do this.
Weeding focuses on reducing "T" (Transpiration by non-target plants).
Step 2: Final Answer:
Live mulching, straw mulching, and plastic mulching are direct physical methods of in-situ moisture conservation.
Weeding is an agronomic management practice and does not contribute to in-situ conservation in the same structural sense.
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