%0 Conference Proceedings %T Effects of winter cover crops in a reduced tillage cropping system on PGPRs activities and soil N levels in simultaneous application of organic manures in a low input production system of Cucurbita pepo L. %A Jahan, Mohsen %A -, - %A Amiri, Mohamad Behzad %J 13th Congress of the International Society for Ethnopharmacology %D 2012