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Evapotranspiration is water loss from soil/water bodies and plants. It's critical for irrigation design, water balance, and climate analysis.

Guida passo passo

  1. 1Reference ET (ET₀): well-watered grass, calculated from temperature, humidity, wind, radiation
  2. 2Actual ET: ET₀ × crop coefficient (varies 0.2-1.2 by crop)
  3. 3Typical: 100-200 mm/month depending on climate

Esempi risolti

Ingresso
ET₀ = 5 mm/day, alfalfa (K_c = 1.0)
Risultato
Daily ET = 5 mm, weekly = 35 mm (irrigation need)
During growing season

Errori comuni da evitare

  • Using ET₀ without crop coefficient (over-irrigating)
  • Neglecting seasonal variation (summer ET much higher)

Domande frequenti

Why does crop type matter?

Deep-rooted crops (alfalfa) use more water; shallow (lettuce) less. Reflectance and canopy architecture differ.

How do you measure ET?

Lysimeters (soil columns), energy balance models, or empirical equations from climate data.

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