Question

explain how canal irrigation is used and controlled to grow rice

Answer 1

Explanation:

Irrigation is the application of controlled amounts of water to plants at needed intervals. Irrigation helps to grow agricultural crops, maintain landscapes, and revegetate disturbed soils in dry areas and during periods of less than average rainfall. Irrigation also has other uses in crop production, including frost protection,[1] suppressing weed growth in grain fields[2] and preventing soil consolidation.[3] In contrast, agriculture that relies only on direct rainfall is referred to as rain-fed or dry land farming.

Irrigation systems are also used for cooling livestock, dust suppression, disposal of sewage, and in mining. Irrigation is often studied together with drainage, which is the removal of surface and sub-surface water from a given area.

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Answer 2

Explanation:

. from river / reservoir / dam / barrage / another canal

. closed or opened (by sluice or gate)

. field flooded in preparation / for nursery beds / before transplanting

. kept flooded during growth

. to a depth of about 30–37cm / 12–15inches

. drained before harvest