INFLUENCE OF IRRIGATION TECHNIQUES ON THE BEHAVIOUR OF SOME PROCESSING TOMATO CULTIVARS
In the first year, 8 irrigation regimes were studied (seasonal water applied equal to 20–40–60–80–100–120–140 and 160% of the maximum evapotranspiration of the crop, ETM) on 'Ventura and 'Petomech' cultivars. In the other two years, 6 irrigation regimes were studied (un-irrigated control and seasonal water applied equal to 33–66–100–133 and 166% of the ETM) on 'Ventura' and 'Petomech' cultivars in 1983, and on 'Ventura' and 'H.P. 244' in 1984. Moreover, drip irrigation was used in 1980 and 1984, whereas in 1983 sprinkler irrigation with a high water application rate (25 mm/h) was adopted. The crops were arranged in double rows in 1980 and 1983 and in a single row in 1984. Maximum crop evapotranspiration (ETM) was evaluated utilizing the "Class A" pan evaporation method and previously estimated tomato crop coefficients (Kc).
Results show that the double row drip irrigated crop gave the best yield, nearly 100 t/ha. The greatest yields were obtained with irrigation regimes corresponding to 100% of ETM and with an irrigation interval of 3.3 days.
The average weight of the fruits and of the dry matter of the fruit juice varied but the small differences among the marketable yields of the cultivars were not significant.