Dynamic change of dry matter accumulation and ralationship between artemisinin and nitrogen, phosphorus, potassium in Artomisia annua Soil water influences on protective enzymes and osmolytes of Urtica dioica and their correlations with leaf photosynthesis and biomass Relationship Between Malic Acid Metabolism-related Key Enzymes and Accumulation of Malic Acid as Well as the Soluble Sugars in Apple Fruit Dynamic change of dry matter accumulation and ralationship between artemisinin and nitrogen, phosphorus, potassium in Artomisia annua