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AP 631 EVAPOTRANSPIRATION                                                                                 (2L+1P) III
(Pre-requisite 130)

Objective
  To impart theoretical and practical knowledge about crop ET estimation and measurement

Theory

UNIT I
  Radiation and its interaction with crop environment and radiation use efficiency, energy balance, its components and their estimation in crop canopy.

UNIT II
  Theories of evapotranspiration – concept of evapotranspiration; potential, reference and actual evapotranspiration;

UNIT III
  Estimation of potential evapotranspiration using different approaches – empirical, aerodynamic, radiation, Bowen ratio, combination and eddy correlation techniques, factors affecting evapotranspiration – meteorological, soil and cultural.

UNIT IV
  Thornthwaite’s climatic water balance.

UNIT V
  Measurement of evapotranspiration using various types of lysimeters, water use efficiency, irrigation scheduling and yield functions.

UNIT VI
  Estimation of evapotranspiration using remote sensing technique.

Practicals
  Radiation balance, Thornthwaite’s method, Blaney Criddle method, Radiation (Makkink’s) method, Bowen’s Ratio, Aerodynamic method, Combination (Penman’s) method, Combination (FAO 56) method, Pan Evaporation, Climatic Water Balance, Lysimeter

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