Correct Option
The correct option is (b) Sprinklers.
Explanation
Water conservation in agriculture relies on adopting irrigation methods that maximize efficiency by minimizing water wastage during transport and application. These methods are essential for sustainable land management and preventing soil degradation.
Statement-wise Analysis
- (a) Canal irrigation: Incorrect. Traditional canal irrigation often suffers from significant water losses due to seepage into the ground (especially in unlined canals) and evaporation from the exposed water surface during transport.
- (b) Sprinklers: Correct. Sprinkler irrigation involves conveying water through pipes and spraying it into the air to simulate rainfall. The use of pipes effectively eliminates water loss through seepage during transport. Additionally, the controlled application of water minimizes deep percolation and surface runoff, making it more efficient than flood irrigation in checking losses through seepage and evaporation.
- (c) Flood irrigation: Incorrect. This method involves flooding the entire field with water. It is highly inefficient as it leads to excessive water loss through deep seepage, surface runoff, and high rates of evaporation from the standing water.
- (d) Rainwater harvesting: Incorrect. While rainwater harvesting is a vital method for conserving water by collecting and storing runoff, it is a technique for sourcing or recharging water, not a method of irrigation application designed to minimize losses during the watering process.
Key Takeaway: Sprinkler irrigation is an effective method to conserve water resources as it significantly reduces losses caused by seepage and evaporation compared to traditional surface irrigation methods.