This work deals with the analysis of variance basis .It starts from monofactor analysis of variance to bifactor analysis of variance . Then , I applied the already mentioned theoretical study to actual issue in the agriculture field . I have chosen wheat and studied the best date to plan it and the best Plant production through a detailed study based o SPSS program . then , I showed the results of each variable in a detailed . Finally , this work can be a basis of another work using other analysis methods and other statistical in the analysis of variance .