Abstract: The aim of the development is to analyse, with the help of a two-factor dispersive analysis, the impact of the factors “year`s character” and “irrigation regime” on the separate biometric indicators for celery. Data for the yield and its structural elements was received and used by a field experiment for examining the irrigation regime that was conducted during the period 2010 – 2012 at the Training Experimental Field of Agricultural University, Plovdiv. Five options were examined: irrigation with 130 % from m norm; irrigation with 100 % from m; with 70 % from m; with 50 % from m; with 30 % from m and without irrigation. It was statistically proved, at a high degree of reliability, the impact of the examined factors and their interaction upon the three observed indicators: mass of the root crop, leaf mass and yield. Strongest impact had the factor “irrigation regime” (94 %).