A Two-Source Energy Balance (TSEB) model computes surface energy fluxes using soil surface temperature and canopy temperature. An experiment was carried out in a research farm near the agrometeorological observatory, at Anand, India to parameterize the TSEB model for the mustard (Brassica Juncea) crop, to estimate surface energy fluxes and validate the TSEB-2T model. The TSEB-2T model was validated using net radiation with a measured value of net radiometer. Results revealed that modeled net radiation for clear sky conditions agreed for all sowings. Very late sowing had comparatively high dr 0.61, r 0.78** and low RMSE 58.12 Wm−2, MAE 46.47 Wm−2 and low MBE 1.66. Net radiation over mustard ranged from 269 to 538 Wm−2 with relatively high peaks in the second sowing date. Sensible heat flux was relatively high during early growth and after the seed development phase. Latent heat flux and sensible heat flux had inverse partitioning patterns during the crop cycle of the mustard. Ground heat flux had negligible partitioning from net radiation after the seed initiation stage. During vegetative to pod initiation phases, the net radiation fraction for latent heat was high compared to sensible heat. Peak daily evapotranspiration based on modeled latent heat during the flowering to pod initiation phase was about 3.7 mm day−1.
The TSEB model was used for estimating surface energy fluxes, and drought assessment on a large scale using remote sensing. This research gives knowledge about how the TSEB model is used in small field scales using canopy and soil temperature to estimate surface energy and evapotranspiration fluxes.