Biology (NTSE/Olympiad)  

3. Improvement In Food Resources


Irrigation :
Irrigation the process of providing water to the soil for the purpose of supplying moisture essential for plant growth.
Irrigation method :
Wells : There are two types of wells, namely dug wells and tube wells. In a dug well, water is collected from water bearing strate. Tube wells can tap water from the deeper strate. From these wells, water is lifted by pumps for irrigation.
Canals : This is usually an elaborate and extensive irrigation system. In this system canals receive water from one or more reservoirs or from rivers. The main canal is divided into branch canals having further distributaries to irrigate fields.
River Lift Systems : In areas where canal flow is insufficient or irregular due to inadequate reservoir release, the lift system is more rational. Water is directly drawn from the rivers for supplementing irrigation in areas close to river.
Tanks : These are small storage reservoirs, which intercept and store the run-off of smaller catchement areas.


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