(i) Tube wells are better form of irrigation than the ordinary wells because : 1. It is capable of irrigating more area, about 2 hectares per day while ordinary wells irrigate 0.2 hectares of area per day. 2. It is operated by an electric motor or by a diesel engine so water can be easily lifted from greater depths and most suitable in those areas where canal irrigation is not available. (ii) The two alternative methods of irrigation are: 1. Sprinkler irrigation. 2. Trickle-drip irrigation.