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Agronomy QUESTION #2028
Question 1
In irrigation scheduling, the concept of 'allowable depletion' refers to:
  • The amount of water that can be applied per irrigation event
  • The fraction of total available soil water that can be depleted before crop stress occurs, typically 50% for most field crops✔️
  • The depth of irrigation water lost to evaporation
  • The time interval between two consecutive irrigations
Correct Answer Explanation
Allowable depletion (management allowable depletion, MAD) is the fraction of plant-available water (PAW) that can be extracted before plant stress affects yield. For most field crops, MAD = 50%, meaning irrigation is triggered when 50% of PAW is depleted to prevent yield loss.