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Contribution of nitrogen and phosphorus on eutrophied irrigation water in a paddy Soil: a case study in taihu Lake Region Leaching loss of nitrogen in rice field N and P accumulation status and their leaching potential in vegetable fields in Fujian Province Behaviour of chlorion from ammonium chloride application in irrigated-desert soil in Hexi Corridor Leaching loss of nitrate from semiarid area agroecosystem Effects of combined application of organic manure and chemical fertilizers on soil nitrogen availability and movement under water and fertilizer saving management in cucumbertomato double cropping system Effect of nitrate leaching of winter wheat field based on straw application in the Yellow River irrigation area of Ningxia Impacts of soil depths on phosphorus leaching losses in manural loessial soil Impacts of irrigation regimes on phosphorus leaching in manural loessial soil STUDY ON NITROGEN MIGRATION IN PURPLE SOIL AND NITROGEN UPTAKE BY RICE Study of nitrate leaching potential from agricultural land in Northern China under long-term fertilization conditions