Poplars are fast-growing species that were planted pure in the past. Mixed plantations of poplar with nitrogen fixing species have been recommended recently to increase the soil fertility. In this study, Ameraican poplar (Populus deltoids) has been planted with Peanut (Arachic hypogaea). The research was carried out on the base of randomized complete block design with five treatments and three replications, including three treatments at poplar plantation spacing (4×3 m), (4×6 m), (4×9m) mixed with peanut and two other treatments included pure plantations of poplar and pure cultivation of peanuts, result showed carbon, nitrogen and pH showed significant differences, but phosphorus and potassium between treatments didn’t show significant difference. The results of comparing height and dbh, showed significant differences between treatments, incorporation of these two plants can help to increase nitrogen fixation in soil and increase growth of poplar; also it causes more stabilization of carbon that they are essential environmental topics at the recent years.

Keywords: Chemical properties, Guilan province, Mixed culture, Peanut, Poplar

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