The Evaluation of Allelopathic Potentia l of Cultured Cucumber Root Exudates Based on Extension Engineering Principles Effects of cultured Astragalus adsurgens root on other plants growth Effect of growth medium composition on the propagation of cultured milk vetch (Astragalus adsurgens Pall) roots and the allelopathic activity of extracts Effect of medium composition on the growth and secretion of cultured root of Astragalus adsurgens Pall The Evaluation of Allelopathic Potentia l of Cultured Cucumber Root Exudates Based on Extension Engineering Principles