Effect of Drought Stress and Exogenous Oligo-chitosan on the Osmotic Adjustment Ability of One-Year-Old Apple Treelet The Physiological Basis of Growth Inhibition of Halophytes by Potassium Studies on the Physiological Characteristics of Drought Resistance in Winter Wheat ADAPTIVE PHYSIOLOGY OF DIFFERENT ECOTYPES OF Phragmites Communis TO SALINITY IN THE Effect of soil drought stress on osmotic adjustment ability of maple leaves Effects of Salinity on the Contents of Osmotica of Monocotyledenous Halophytes and Their Contribution to Osmotic Adjustment