Question

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: The distribution efficiency is an important parameter of uniform water application in surface irrigation method design. Reason R: The concept of uniformity coefficient used in sprinkler irrigation system design is similar to distribution efficiency in surface irrigation system. In the light of the above statements, choose the most appropriate answer from the options given below
• Both A and R are correct and R is the correct explanation of A
• Both A and R are correct but R is NOT the correct explanation of A
• A is correct but R is not correct
• A is not correct but R is correct

• A. Both A and R are correct and R is the correct explanation of A
• B. Both A and R are correct but R is NOT the correct explanation of A
• C. A is correct but R is not correct
• D. A is not correct but R is correct

Hint:

Important irrigation uniformity concepts:
• Surface irrigation \(\rightarrow\) Distribution efficiency
• Sprinkler irrigation \(\rightarrow\) Uniformity coefficient Both evaluate: \[ \boxed{ \text{Uniformity of water application} } \] Better uniformity means:
• Better crop growth
• Lower water loss
• Higher irrigation efficiency

Answer 1

The Correct Option is A

Concept: Uniform application of irrigation water is extremely important because non-uniform application causes:
• Water wastage
• Deep percolation losses
• Crop stress
• Reduced yield Different irrigation systems use different indices to evaluate uniformity:
• Surface irrigation uses distribution efficiency
• Sprinkler irrigation uses uniformity coefficient Both parameters essentially evaluate how uniformly water is distributed over the field.

Step 1: Analyzing Assertion A. Assertion A says: \[ \text{“Distribution efficiency is an important parameter of uniform water application in surface irrigation method design.”} \] This statement is correct. Distribution efficiency evaluates how evenly water is stored in the root zone. It is defined as: \[ \eta_d = \left( 1- \frac{y}{d} \right)\times100 \] where:
• \(y\) = average numerical deviation from mean depth
• \(d\) = average depth stored Higher distribution efficiency means:
• Better water uniformity
• Better irrigation performance Hence: \[ \boxed{\text{Assertion A is correct}} \]

Step 2: Analyzing Reason R. Reason R states: \[ \text{“Uniformity coefficient in sprinkler irrigation is similar to distribution efficiency in surface irrigation.”} \] This statement is also correct. Christiansen’s Uniformity Coefficient (CU) measures: \[ \boxed{ \text{Uniformity of water application} } \] Similarly, distribution efficiency in surface irrigation also measures: \[ \boxed{ \text{Uniformity of water distribution} } \] Thus both concepts are functionally similar. Hence: \[ \boxed{\text{Reason R is correct}} \]

Step 3: Checking whether Reason explains Assertion. The assertion says distribution efficiency is important because uniform application is required. The reason explains that the same concept of uniformity is used in sprinkler irrigation through uniformity coefficient. Thus the reason supports and explains the significance of distribution efficiency. Therefore: \[ \boxed{ \text{Reason R correctly explains Assertion A} } \]

Step 4: Selecting the correct option. Since:
• Assertion A is correct
• Reason R is correct
• Reason correctly explains assertion Therefore: \[ \boxed{ (A)\ \text{Both A and R are correct and R is the correct explanation of A} } \] Final Conclusion: Distribution efficiency and uniformity coefficient both represent the concept of uniform water application efficiency. Hence the correct answer is: \[ \boxed{ (A) } \]