Effects of combined drought and salinity stress on germination and physiological characteristics of maize (Zea mays). Evaluation of drought-resistant physiological characteristics of roots and leaves for main greening tree species in Northwest Liaoning Province, China in spring. Effects of exogenous silicon on physiological characteristics of cucumber seedlings under ammonium stress. Physiological and Biochemical Changes in Microcystis aeruginosa Qutz. In Phosphorus Limitation Effects of selenite addition on selenium absorption, root morphology and physiological characteristics of rape seedlings.