In drip irrigation method, the drip nozzles are fixed on laterals, discharging water at a very small rate of the order of
- A0.1 to 1 litre per hour
- B1 to 2 litres per hour
- C2 to 10 litres per hourCorrect
- D10 to 15 litres per hour
Solution
Concept
In drip irrigation, emitters give water drop by drop at a very low rate, usually 2 to 10 litres per hour.
Step-by-step solution
1. In drip irrigation, water flows through main and sub-main pipes, then laterals. 2. Drip nozzles (emitters) are fixed on the laterals near the plant roots. 3. They discharge water slowly, drop by drop. 4. Standard textbooks (for example S.K. Garg) give a discharge of about 2 to 10 litres per hour. 5. So the answer is (C).
Explanation
Drip irrigation gives water directly to the root zone at a very slow rate. Each drip nozzle usually gives about 2 to 10 litres per hour. This saves water and gives very high irrigation efficiency.
Why the other options are wrong
A: 0.1 to 1 L/h is too low for normal drip emitters. B: 1 to 2 L/h is only the lower end of the range, not the standard range. D: 10 to 15 L/h is too high, more like micro-sprinklers or bubblers.
Shortcut
Remember the drip range as 2 to 10 litres per hour.
Common mistake
Choosing 1 to 2 L/h because drip is 'very slow'. The textbook range is 2 to 10 L/h.
Correct answer: C) 2 to 10 litres per hour