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Why does agriculture account for most global water withdrawals?
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water
Water is the most plentiful compound on Earth and is essential to life. Although water molecules are simple in structure (H2O), the physical and chemical properties of water are extraordinarily complicated.
Agriculture accounts for approximately 70 percent of all available freshwater withdrawals globally, primarily due to the extensive requirements of irrigation.1
This high level of consumption is driven by several factors:
- Crop Requirements: Different crops have significant water needs to thrive. For example, while cereal grains require substantial amounts of water, crops like rice can require two to three times the volume needed by other grains to support their growth cycles.2
- Inefficient Distribution: Many agricultural regions rely on surface irrigation, such as simple flooding. This method often inundates fields with more water than crops actually require, leading to significant losses through evaporation and seepage during transport from the water source to the fields.1
- Expansion and Intensification: To meet the food needs of a growing human population, agriculture has both intensified and expanded into arid zones that lack sufficient natural rainfall, necessitating the heavy use of diverted surface water or pumped subsurface water.213
Efforts to improve irrigation efficiency and implement reduced-volume irrigation are central to sustainable agriculture, as they aim to minimize waste while still meeting the essential water needs of crops.14