4. Discussion and conclusions
In this study, the daily average ETc of greenhouse grown tomato
calculated for each of the 7 to 15-day intervals increased linearly
as Rs, Ta and VPD increased. The results were consistent with the
study by Liu (2010), but the correlation between the daily average
ETc and the meteorological variables in their study was relatively
lower than that in this study. Similar results were also reported in
greenhouse grown cucumber (Yang et al., 1990; Zhang et al., 2010).