Crops need adequate supply of water
Crops grow best and produce most when they have an adequate supply of water available to them. Water is mainly used for transpiration and smaller amounts are stored in plant tissues.

Different sources of water
Sources of water for crop production are rainfall, shallow groundwater and irrigation water, which is water diverted from surface flows or groundwater. Often in marginal rainfall areas, irrigation supplements rainfall.

Recession farming and water harvesting
A special form of crop production takes place under recession farming.
Water harvesting is another technique to ensure water supply.

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Table 1 ...shows the total amount of water needed to produce a Kg of some staple crops