The researchers studied a method called flux variance to estimate heat fluxes in tea plants. They compared this method to a more complex one called eddy covariance. The flux variance method uses air temperature measurements to estimate heat fluxes at a lower cost and with less complexity. The study found that the flux variance method accurately estimated sensible and latent heat fluxes in tea plants, especially during the summer season. The results showed good agreement between the estimated and measured heat fluxes, indicating that the flux variance method is a reliable alternative to the eddy covariance method for studying evapotranspiration in agricultural fields.