Question

when does the water in rainfed tanks become most vivid

Answer 1

A reliable and suitable irrigation (as surface or pressurized) can be improved agricultural production and irrigation efficiency. There are many studies to increase and manage irrigation efficiency [1-14]. A large number of considerations must be taken into account in the selection of an irrigation system. These will vary from location to location, crop to crop, year to year, and farmer to farmer. Table 1 shows a list of advantages and disadvantages of irrigation methods.

Figure 1 shows global precipitation and the Reference evapotranspiration (ET0) [15]. The values of ET0 for the Arabian Peninsula, Sahara, Gobi Desert, and the major areas in Australia range up to three meters per day. At latitudes greater than 40°S and 40°N, amounts of one meter and lower values can be fouumf

is form rainfed areas. Therefore, increasing irrigated agriculture is necessary. But, why tendency to irrigation is low? In many areas of the world, water resources are limited and irrigation is not economical. In pressurized irrigation, although irrigation efficiency is high but amount of required water is lower than surface irrigation but cost of pressurized method is very high. Agricultural integration is an affordable approach. Moreover, increasing irrigation efficiency led to use of surface irrigation in small farms. However, selection of an appropriate method for irrigation is more important than other mentioned cases. In some conditions, deficit irrigation is sufficient to achieve to maximum of production. In other conditions, notifying to all effective factors (to choose irrigation system) include compatibility, economics, topographical characteristics, soils, water supply, crops, social influences, external influences and awareness of advantages and disadvantages of different irrigation systems (Table 1) led to maximizing efficiency and finally increasing tendency to irrigated agriculture.

Answer 2

The water in rain-fed tanks is bright and gay when the sun is shining.