The correct answer is: d) Water harvesting structures.
Water harvesting structures are a traditional irrigation practice in Nagaland. They are used to collect rainwater and store it for later use. This water is then used for irrigation, drinking, and other purposes.
There are many different types of water harvesting structures, but the most common are:
- Rainwater harvesting tanks: These are large tanks that are built to collect rainwater. They are usually made of concrete or stone, and they can be either above-ground or underground.
- Dug wells: These are wells that are dug into the ground to reach groundwater. They are usually lined with bricks or stones to prevent the soil from collapsing.
- Springs: These are natural sources of water that flow out of the ground. They can be used for irrigation or drinking.
Water harvesting structures are an important part of the traditional way of life in Nagaland. They help to ensure that people have access to water, even during dry periods.
Diversion channels, lift irrigation, and sprinkler systems are not traditional irrigation practices in Nagaland. Diversion channels are used to divert water from rivers or streams to fields. Lift irrigation is used to lift water from wells or other sources to fields. Sprinkler systems are used to spray water on fields. These methods of irrigation are not common in Nagaland because they require more infrastructure and technology than water harvesting structures.