EFFECT OF IRRIGATING QUOTA ON WTEAT YIELD, TOPDRESSING EFFICIENCY AND ITS LOSS Nitrogen flux and its manipulation in the cropland ecosystem of the North China Plain Effects of deficit irrigation on physio-ecological indices of winter wheat Effects of alternative irrigation on eco-physiological characteristics of wheat/faba-bean intercropping Effects of regulated deficit irrigation on accumulation and distribution of biomass and nitrogen, and yield of island cotton Application and validation of AquaCrop model in simulating biomass and yield of oil flax in Northwest China Ecological stoichiometric characteristics of oasis spring wheat fields under regulated deficit irrigation