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Irrigation schemes in the world use about 3 500 km 3 water per year, of which 74% is evaporated by the crops. [7] This is some 80% of all water used by mankind (4 400 km 3 per year). The water used for irrigation is roughly 25% of the annually available water resources (14 000 km 3 ) and 9% of all annual river discharges in the hydrological cycle .
Agricultural hydrology is the study of water balance components intervening in agricultural water management, especially in irrigation and drainage. [ 1 ] Illustration of some water balance components
Irrigation can also be understood whether it is supplementary to rainfall as happens in many parts of the world, or whether it is 'full irrigation' whereby crops rarely depend on any contribution from rainfall. Full irrigation is less common and only happens in arid landscapes experiencing very low rainfall or when crops are grown in semi-arid ...
Irrigation is the artificial exploitation and distribution of water at project level aiming at application of water at field level to agricultural crops [1] in dry areas or in periods of scarce rainfall to assure or improve crop production.
A satellite image of circular fields characteristic of center pivot irrigation, Kansas Farmland with circular pivot irrigation. Center-pivot irrigation (sometimes called central pivot irrigation), also called water-wheel and circle irrigation, is a method of crop irrigation in which equipment rotates around a pivot and crops are watered with sprinklers.
Countries that conducted an agricultural census during the WCA 2010 round (2006–2015) [1] A census of agriculture is a statistical operation for collecting, processing and disseminating data on the structure of agriculture, covering the whole or a significant part of a country. Typical structural data collected in a census of agriculture are ...
For example, when applied to crop irrigation it is the yield of crop obtained through use of a given volume of irrigation water, the “crop per drop”, which could also be expressed as monetary return from product per use of unit irrigation water.
Country/Territory/Region Irrigated land (km 2) Date of information World 3,242,917 2012 est. Afghanistan 24,930: 2020 Albania 1,820: 2020 Algeria 12,605: 2016 American Samoa 0