Physiological and Ecological Effects of Water Collecting and Conservation Technique on Dry-land Millet EFFECT OF CADMIUM,LEAD AND THEIR INTERACTIONS ON THE PHYSIOLOGICAL AND ECOLOGICAL CHARA CTERISTICS OF ROOT SYSTEM OF Brassica chinensis Advances on physiological and ecological effects of cadmium on plants Physiological and ecological effects of potassium on expansion of crocus corm Main characteristics of physiological-ecological dynamics of soybean during the growth cycle under Cd stress Ecological effect of photorespiration of plants under environmental stress