Crop Management Factors Quiz
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Questions and Answers

What is the purpose of determining the crop management factor C?

To reflect the combined effect of various crop management practices.

How is the factor C computed for a particular crop?

By computing the ratio of soil loss from cropped plot to the corresponding soil loss from a continuous fallow land for each crop stage separately.

What does the value of factor C indicate?

It reflects the effectiveness of crop management practices in reducing soil loss.

How is the Support Practice Factor (P) defined?

<p>It is the ratio of soil loss with a support practice to that with straight row farming up and down the slope.</p> Signup and view all the answers

Explain the difference between Period 2 and Period 3 in the crop growth stages.

<p>Period 2 is the establishment phase, ranging from 1 to 2 months after seeding, while Period 3 is the growing period from seeding to crop harvesting.</p> Signup and view all the answers

What is Period 4, as mentioned in the text?

<p>Period 4 is the residue or stubble phase, ranging from crop harvesting to summer ploughing or new seed bed preparation.</p> Signup and view all the answers

What is the formula for calculating the LS factor according to Wischmeier and Smith (1962)?

<p>LS = 0.065 + 0.045S + 0.006L</p> Signup and view all the answers

How is the LS factor calculated in the M.K.S. system based on the observations mentioned by Wischmeier and Smith (1978)?

<p>LS = 0.2λ^m sinθ</p> Signup and view all the answers

Define the crop management factor C.

<p>The expected ratio of soil loss from a cropped land under specific crop to the soil loss from a continuous fallow land, considering identical soil type, slope, and rainfall conditions.</p> Signup and view all the answers

How is erosion control effectiveness evaluated for different crops and cropping practices?

<p>Based on the five recommended crop stages introduced by Wischmeier (1960).</p> Signup and view all the answers

What does the period 1 (Seed Bed) refer to in the evaluation of erosion control effectiveness?

<p>The period from seeding to one month thereafter.</p> Signup and view all the answers

How do crops and cropping practices impact soil erosion?

<p>They affect soil erosion through factors like crop type, cover quality, root growth, and water use by plants.</p> Signup and view all the answers

What are the sub-factors used to calculate the cover management term (C) in the Modified Universal Soil Loss Equation (MUSLE)?

<p>Considerations of prior land use, crop canopy, surface cover, and surface roughness</p> Signup and view all the answers

How was the USLE modified to create the Modified Universal Soil Loss Equation (MUSLE)?

<p>By replacing the rainfall energy factor (R) with a factor known as the 'runoff factor'</p> Signup and view all the answers

What does the MUSLE equation help model in terms of sediment yield?

<p>Sediment yield from individual storms</p> Signup and view all the answers

Why is the MUSLE considered advantageous from a modeling perspective?

<p>It can model daily, monthly, and annual sediment yields of a watershed by combining hydrological models</p> Signup and view all the answers

What does the peak rate of runoff (qp) represent in the MUSLE equation?

<p>Sediment transport</p> Signup and view all the answers

How does the MUSLE model contribute to increasing sediment yield prediction accuracy?

<p>By considering Q as the detachment process and qp as sediment transport</p> Signup and view all the answers

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