Background: The suitability of the Life Cycle Assessment (LCA) methodology to analyze the environmental impact of agricultural production is investigated. Objective: This study was conducted to assess the impact of wheat production on environment under rain fed and watered farming systems in north of Iran. Life cycle assessment (LCA) was used as a methodology to assess all environmental impacts of wheat production through accounting and appraising the resource consumption and emissions. Data were collected from 72 farms by used a face to face questionnaire method during 2011 year in Guilan province. Results: In rain fed farming system, total green house gases emissions for wheat production were calculated to be 440.4 kg CO2 eq ha -1 calculated. In watered farming system, total green house gases emissions for wheat production were calculated to be 570.7 kg CO2 eq ha -1. Conclusion: Life cycle assessment (LCA) is defined as the compilation and evaluation of the inputs, outputs and potential environmental impacts of a product system throughout its life cycle. Thus, LCA is a tool for the analysis of the environmental burden of products at all stages in their life cycle.
