Identify the cheaper irrigation methods from the following.
Moat and dhekli system
Sprinkler system and moat system
Sprinkler system and drip system
Drip system and rahat system
Sprinkler and drip systems are modern irrigation methods and are expensive. Moat and dhekli are traditional methods of irrigation and are cheap.
If moat is a pulley-system, rahat is a________ system.
The best technique of watering the fruit plants and trees is :
(a) chain pump system (b) sprinkler system (c) moat (pulley system) (d) drip system