Important terminology in news
Definition:
Evaporative Demand is a measure of how “thirsty” the atmosphere is — i.e., the potential amount of water that could evaporate from land surfaces if water is abundantly available.
Measurement:
Measured using Standardised Short-Crop Evapotranspiration (ET₀):
Based on a 12 cm tall grass surface with:
Unlimited water supply
No stress conditions
Evapotranspiration =
Evaporation (from soil, water bodies, etc.)
Transpiration (from plant leaves)
Consequences of High Evaporative Demand:
Accelerated moisture loss from soil and crops
Leads to drying of land even in the presence of normal rainfall
Negatively affects:
Crop health and yield
Irrigation requirements
Water resource management
Climatic & Agricultural Relevance:
Rising global temperatures and heatwaves are intensifying evaporative demand.
Key parameter in:
Drought monitoring
Water budgeting
Climate-resilient agriculture strategies
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