Question

(ii) Irrigation water supplied by rivers in flood often carries silt which adds to soil of the belas,
fertility and crop yield.
(iii) With irrigation, cultivation can be done round the year and not during the rainy season only.
(iv) in desert areas, the constant flow of irrigation water through the soil helps to reduce the salinity of
the soil. However, if the water is allowed to evaporate in the fields, salt content of soil will increase.
(0) Modern multipurpose dams not only provide water for irrigation but also help to control floods,
generate hydroelectric power and improve the navigability of the rivers.
ctors Controlling Irrigation
The irrigation or water requirements of crop plants depends on the following two factors:
1. Irrigation dependent on the nature of the crop plants (ie., crop-based irrigation).
2. Irrigation dependent on the nature of soil of the crop fields (i.e., soil-based irrigation).
1. Crop-based irrigation. Water requirements of different crops are different during the various stages of
ir growth and maturation (ripening). Some crop plants require more water, while others need less water,
example, paddy crop (rice crop) is transplanted in standing water (wet lands) and requires continuous
ter supply, whereas, other crops such as wheat, gram and cotton requires less water. For cereals such
wheat, irrigation is required before ploughing the field (i.e., before tilling), at the time of flowering and
he time of development of the grain.
2. Soil based irrigation. Irrigation also depends on the nature of the soil in which crop is grown. The crops
wn in a sandy soil need irrigation more frequently, whereas the frequency of irrigation is comparatively
for
crops grown in a clayey soil. Let us find out why this occurs ! Sandy soil is highly porous, and has​

Answer 1

Answer:

Simply put, flood irrigation is the practice of flooding land with amazing amounts of water to grow crops. Although it may seem inefficient and even wasteful at first glance, flood irrigation is more environmentally friendly than it appears. ... Farmers are flexible with the methods they use to water crops.