Stomatal conductance behavior of two Cuban tomato varieties in field conditions and limited irrigation
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Abstract
It was studied the stomatal conductance (gs) behavior in tomato plants varieties Inca-17 and Amalia, cultivated in field conditions. Moisture profiles were performed at two depths 0-15 cm and 15-30 cm, using the gravimetric method. Climatic data during the test were taken from a meteorological station located 1,500 m from the experimental area. The climatology was typical of the months in which the study was conducted (January-March) and only three precipitations (60 mm) were recorded. Abaxial gs were measured at different times of day and similar leaves evaluated the current osmotic potential (ΨOs Act.) and the osmotic potential at maximum saturation (ΨOs Sat). Soil moisture values were almost always higher or equal in the INCA-17 block than in the Amalia variety. The gs highest values were obtained at 11:00 am and 36 DAT in Inca-17 plants and the smaller ones at 14:00 hours at 49 DAT in both varieties. As for ΨOs Act, the most negative values corresponded to Amalia variety and reached 49 DAT values of -1.1 MPa. The Pearson correlation showed that the variables that correlated most with the gs in the morning hours were soil moisture, daily solar radiation (RSD according its acronymsin) and daily evaporation, and in the afternoon were the maximum values and average temperatures.
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