The area that can be controlled by the automated irrigation system is mainly defined according to the amount of water supplied by the water source (or the amount of water output from the well). That is, the amount of water supplied to the area of farmland that can meet the irrigation demand in one irrigation cycle.
The water source is the machine well, the available flow rate is the good output, and the maximum possible irrigation area can be determined according to the water output of the machine well.
For example, the design irrigation quota is 300 m3/hm2, each irrigation cycle is 10 d, the daily irrigation hours are 10 h, and the effective utilization coefficient of irrigation water is 90% to calculate, the control area of a single well is: well water output 60-100 m³/h, single good control area 18~30 hm2; Well water output 40-60m³/h, single good control area 12-18 hm2; Well water output 20-40 m³/h, single good control area 6~12 hm2; Well water output 10-20 m³/h, single good control area 3-6 hm2.
When the water source is a river, pond, or canal, the irrigation area should be determined by considering factors such as the amount of water source and economic conditions.
Regarding the irrigation scale of a single project, the irrigation area controlled by a first system is generally 33~200 hm2 for the current surface water drip irrigation project. The more economical and reasonable single project area is 33~100 hm2, which should not exceed 200 hm2, and most of them are irrigated single crops.
Under normal circumstances, the drip irrigation system adopts rotation irrigation, the control area of the irrigation community is generally 0.33~1.33 hm2, a rotational irrigation group includes 2~4 rotational irrigation communities, and a drip irrigation system has about 20 rotational irrigation groups.
