Question:
When the soil cover of the crop is about 70-80%, the crop coefficient is referred to as
When the soil cover of the crop is about 70-80%, the crop coefficient is referred to as
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The crop coefficient ($K_c$) is highest during the mid-season stage because the dense canopy cover maximizes transpiration, making this the most critical period for irrigation water management.
Updated On: Jul 23, 2026
- Initial stage
- Mid season stage
- Crop development stage
- Late season stage
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
The crop coefficient ($K_c$) is a ratio used to estimate a crop's water requirements (evapotranspiration) at different growth stages relative to a reference crop.
The crop life cycle is divided into four distinct stages to determine $K_c$.
Step 2: Detailed Explanation:
Let us review the crop growth stages used to determine the crop coefficient:
1. Initial Stage: This stage runs from the planting date until the crop achieves approximately $10\%$ ground cover. Water loss is driven primarily by soil evaporation.
2. Crop Development Stage: This stage runs from $10\%$ ground cover until the crop achieves effective full ground cover, which is typically defined as $70\%\text{ to }80\%$ soil cover. During this stage, transpiration increases rapidly.
3. Mid-Season Stage: This stage begins once the crop achieves effective full cover ($70-80\%$ soil cover) and runs until the start of physiological maturity (evidenced by leaf yellowing or senescence). During this stage, the crop coefficient ($K_c$) reaches its peak value, and water consumption is highest.
4. Late Season Stage: This stage runs from the start of maturity until harvest, during which water consumption decreases.
Therefore, when the soil cover reaches $70-80\%$, the crop enters the Mid-season stage.
Step 3: Final Answer:
The crop coefficient at $70-80\%$ soil cover refers to the Mid season stage, corresponding to option (B).
The crop coefficient ($K_c$) is a ratio used to estimate a crop's water requirements (evapotranspiration) at different growth stages relative to a reference crop.
The crop life cycle is divided into four distinct stages to determine $K_c$.
Step 2: Detailed Explanation:
Let us review the crop growth stages used to determine the crop coefficient:
1. Initial Stage: This stage runs from the planting date until the crop achieves approximately $10\%$ ground cover. Water loss is driven primarily by soil evaporation.
2. Crop Development Stage: This stage runs from $10\%$ ground cover until the crop achieves effective full ground cover, which is typically defined as $70\%\text{ to }80\%$ soil cover. During this stage, transpiration increases rapidly.
3. Mid-Season Stage: This stage begins once the crop achieves effective full cover ($70-80\%$ soil cover) and runs until the start of physiological maturity (evidenced by leaf yellowing or senescence). During this stage, the crop coefficient ($K_c$) reaches its peak value, and water consumption is highest.
4. Late Season Stage: This stage runs from the start of maturity until harvest, during which water consumption decreases.
Therefore, when the soil cover reaches $70-80\%$, the crop enters the Mid-season stage.
Step 3: Final Answer:
The crop coefficient at $70-80\%$ soil cover refers to the Mid season stage, corresponding to option (B).
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