The -present research -a-imed to evaluate the -agronomic performance of growing tettuce variety Great takes 659 according to the fourionar phases in the dfstrict andptovince of lamas, atso the most appropriate tunar phase ana itS influence wa$ determinad in performance ancfprofitabifitY ofthe crop. The research was concfuctedon the grounds of fundo '"The Pacific~· owned by Mr. Jorge luis Petaez Rivera, pofiticaUy located in the dístrict and .province of lamas, department of San Martín. Statisfical Des"ign. randomized complete. block (RCBD) With.- four blocks- and four -treatments, with -a total of 6 -experimentar -unjfs were used. The information gathered in the field was processed us-in9 SPSS t9st-atistical software; which- uses- the- P-value -comparison -signifamt at confidence fevels of -0.--05 and 0.-01 differences in the anatysis of variance (ANOVA} and- mutttple- range test· of...