PLANT ROOT EXUDATION AND ITS SIGNIFICANCE IN FORESTRY Autotoxic Effect of Cultured Seedlings of Paeonia ostii T. Embryo THE ROOT EXUDATION OF GRAIN AMARANTH AND ITS ROLE IN RELEASE OF MINERAL POTASSIUM Effects of simulated exudate C:N stoichiometry on dynamics of carbon and microbial community composition in a subalpine coniferous forest of western Sichuan, China Effects of Nitrogen and Phosphorus on the Root Exudates during Grain Filling and Their Relations with Grain Quality of Rice Effect of Nitrogen and Phosphorus on the Amino Acids in Root Exudates and Grains of Rice during Grain Filling Effect of Aluminum Stress on the Root Exudation of Longan (Dimocarpus longana) Seedlings