The study aimed at: determining farmers' knowledge levels about environmental problems affecting agricultural development, identifying the most critical environmental problems that facing farmers in their vil‌lages and farmers' suggestion to encounter these problems, determining relationship between farmers' knowledge acquisition, about some envi-ronmental problems, and some personal and social- variables. A random sample of 100 farmers was drawn from 4 villages (25 respondents/ vil-lage) The study sample was drawn from villages of Manouat, and Ta‌mouh (Giza District/ Gin Govemorate), Nawag and Mehallah Marhoum (Tanta District/ Gharbia Governorate). A pretested written questionnaire and interpersonal interviews were used in collecting the data. Frequen‌cies, percentages, mean, and CM-square were. Used in analyzing the studied data. The study findings were as the following :- 1. Knowledge farmers' level for 47% of the respondent was low. 51% of the respondents had medium level, and 2% of the respondent had a high knowledge level. 2. Eleven environmental problems facing farmers and those problems were identified. 3. Agricultural extension agents were perceived as the main information source for the majority the respondent. 4. Farmers' preferred methods were extension meeting, broadcasting and t.v rural programs, relatives and neighbours, newspapers and magazines, extension agent, research centers and stations. Finally ex-tension publications such as bulletin, magazine and posters. 5. There was signilcant relationship at 0.01 level between farmers knowledge degrees about environmental problems and each of the fol-lowing variables: educational status, years of education, family type, exposure to information sources and cosmopolitanism.