Daily evapotranspiration (EVPT) of two bedding plants osteospermum 'Dened impatiens 'Timor' grown on ebb-and-flow benches was measured by weighing method, together with assessment of indoor climate parameters (solar radiaperature, humidity) and leaf area index (LAI) at different growth phases. The 'on inside the greenhouse as affected by climatic factors i.e.: solar radiation, re, humidity and air velocity was also measured using Piche's evaporome:ts were irrigated according to soil water potential (irrigation at -0.5; -3; -ID 'a). Irrigation at high water potential decreased plant growth and leaf area of lts. LAI of osteospermum decreased as water deficit increased. In the case of .,~ the highest LAI at full flowering obtained plants irrigated at -3 kPa. actual, daily EVPT of plants irrigated at -0.5 kPa increased with plant growth in the case of osteospermum while that of impatiens remained at similar level. At flowering water stress decreased strongly EVPT of osteospermum and in lesser " . of impatiens. Osteospermum irrigated at -0,5 kPa had 2,5 higher EVPT than impatiens. For both plants good, positive correlation between EVPT and daily mean temperature between 7-17 h and evaporation according to Piche' s evaporometr readings were obtained. As expected EVPT was negatively correlated with relative irrespective the growth phase and soil water potential. The correlation and solar radiation, was changed during plant growth due to differences in temperature under shading screen, used during sunny days.
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