12 pages, The research aims to identify level of farmers knowledge in Rabia Sub-district/Nineveh governorate on potato cultivation , identify the differences in Knowledge level according to some variables: Age, Education level, years' number of experience potato farming, land ownership, number of dependent information sources of potato , monthly income, type farming career and previous training, and identify the problems facing the potato cultivation. The data were collected by a questionnaire, and analyzed by using Kruskal-Wallis test, Mann_Whitney test. The important results showed that (45.88 %) of the farmers have medium knowledge, the higher knowledge level in crop service field , there are significant differences in knowledge levels according to age, educational level, number of experience years of potato crop, type of farming career and the important problems facing potato farmers is high price of production cost, also there are some recommendations and suggestions.
