Assessing a suitable method in estimating Evapotranspiration for crop water requirement

Partitioning evapotranspiration of desert plants under different water regimes in the inland Heihe River Basin, Northwestern China

“…The T and ET of various desert plants with the same canopy diameter in the same region showed no significant differences under the same water regimes; significant differences in ET were observed under different water regimes (P < 0.05; Figures 3 and 4). Usually, the transpiration rate does not decrease significantly until the soil moisture falls below 50% of field capacity (Soundar, Vijayalakshmi, and Mariappan 2010). Figure 2 shows that the T under the FC 50% treatment in the middle reach was significantly higher than that under FC 20% in the same region and under these two water regimes in the lower reach; H. ammodendron in the middle reach had a strong ability to assimilate carbon (Gao et al 2010).…”

Determination of water requirement and irrigation timing forAmaranthus hybridusin Maiduguri metropolis, north-eastern Nigeria

“…The Penman-Monteith equation is: This method uses the combined climatologically effect of temperature variations and aerodynamic variations seems to be more promising in deriving evapotranspiration. Thus the equation used to estimate reference crop evapotranspiration (ETo) and equation are sufficiently adjustable large to stress the importance on water management (Soundar Rajan et al [9]). …”

“…Hence, irrigation time, [9].) Note: T temperature RH relative humidity SS sunshine hours Rad radiation u z wind speed at height higher than 2m u 2 wind speed at 2 m height.…”