i. The monsoon in India is uneven, erratic in nature and is unreliable. While it may rain well during one year, in another year, the rainfall may be scarce. Hence Irrigation is necessary despite the monsoon.
ii The drip method of irrigation is the best among all modern methods of irrigation as in this method water is directly given to the crops through perforated pipes. This reduces evaporation and each crop may be irrigated according to its requirements.
iii Alkaline salts may come up to the ground in areas where canals are used for irrigation. This happens when the water table is only a few feet below the ground. This salt when it mixes with the soil makes it unproductive.