In this book, different empirical methods were compared with the
objectives for quantifying total water loss through evapotranspiration
by chickpea crop in mollisol of Uttarakhand. Evapotranspiration of
chickpea was measured with weighing type lysimeter. Data on pan
evaporation measured with USWB class A pan evaporimeter and chickpea
parameters for the corresponding period were collected from
Meteorological observatory. Evapotranspiration from chickpea was also
estimated by using mathematical methods of Thornthwaite, Turc,
Stephens-Stewar, Jensen-Haise, Blaney-Criddle and modified Penman.
Higher growing degree days 1810.4 was observed during 2005-06.
Evapotranspiration of chickpea during 2005-06 and 2006-07 were about
416.5 and 475.6 mm, respectively. As the pan evaporation did not give
accurate estimate of ET, both on seasonal and as well as weekly basis.
Thus, the pan evaporation does not seem to be good criterion for the
estimation of ET. Modified Penman method was found to be most very
suitable for estimation of ET in tarai region of Uttarakhand.