Frequência de irrigação da cultura do tomateiro (Lycopersicum esculentum) determinada pela evaporação do tanque classe A

Abstract

This study was undertaken in Pentecoste, Ceara, Brazil from 1977/1978 with the objective to stablish the indus trial tomato crop water need, Rossol variety. The experimental design was at random with 4 treatments and 5 repetitions. Irrigations were based upon the water evaporation from the Class A pan using the coefficients 0,55; 0,70; 1,00 and 1,15 being the treatments. When the daily evaporation accumulated, from the pan, multiplyed by those coefficients were close or equal to the water capacity retention (66,3 mm) of the soil layer correspondeng to the depth of the crop root system, the correspondent treatment was irrigated. Significative differences were observed among treatments for fruit production and occurence of Murcha of Fusarium. No significative differences were observed among the treatments in relation to fruit quality for industry and early ripening.