A. GHAEMI - Departments of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I.R. Iran
A. RAHIMI - Departments of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I.R. Iran
Z. BANIHASHEMI - Departments of Plant Protection College of Agriculture, Shiraz University, Shiraz, I.R. Iran

Effects of water stress and Fusarium oxysporum f. sp. lycoperseci (Fol) on the growth of tomatoes were studied in a greenhouse experiment. Treatments consisted of five levels of water stress (۱, ۳, ۵, ۷ and ۹ day irrigation intervals). Infested soil consisting of ۴۰۰ chlamydospores g۱ of Fol and non infested soil were used. Experiments arranged in a completely randomized design with ۸ replications (۴ infested and ۴ non infested soil) under greenhouse conditions (۱۸-۳۵ ۰C). Six week old tomato seedlings, cultivar Porimo, were exposed to water stress after transferring to infested and non infested soils. During the experiment, leaf area, final plant height, shoot dry weight and shoot nitrogen content were measured. Disease symptoms appeared earlier in treatments with high water stress than the other t reatments. Results showed that leaf area, final plant height, shoot dry weight and shoot nitrogen content were reduced both with increasing irrigation intervals and in infested soils. Root colonization by Fol increased with increasing irrigation intervals, but differences were not significant.

Fusarium oxysporum, Growth, Nitrogen Content, Tomatoes seedlings, water stress