Leaching Of TIN On Vegetable Open Field In Pudong New District

Solute in soil not only in composition and state, but also be in an incessant kinetic mode. Soil liquid in field-scale is affected by both natural and artificial factors, such as rainfall, irrigation, temperature, wind speed and uptake by plant root etc. Solute transport is also affected by solute's chemical and physical characteristic. Although it follows basic physical and chemical theorem all of these make it difficult to describe solute transport in soil solution.The dissertation is finished with the support of Shanghai science and technology promote agriculture project: "ration study of dry farmland fertilizer nitrogen and phosphorus losses process in Shanghai suburbs". Support by the National Nature Science Key Foundation of China, No. 40131020, 40173030). Foundation for the Excellent Youth Teacher by the Ministry of Education (41198054) .Study of this dissertation is based on a great deal of basic data collected from field sampling. From 2004 to 2005, we sampled soil and vegetable from dry farmland for two years and greenhouse watermelon soil for one year, leakage and spot runoff experiments at vegetable soil in the open field in Shanghai suburbs. We get total above 4000 data after analyzing nitrogen of soil, vegetable, and runoff and leakage water.The main aim is to research the change on the soil and soil's solution in dry vegetable farm. Try to finding the variety orderliness. The fertilizer quantity is different. And there are normal quantity of fertilization, reduce quantity fertilization, none fertilization. Analyze nitrogen of solution in different soil section (30cm, 50cm, 70cm, and 120cm), and influence to groundwater. Furthermore, to research environmental effect to soil solution, such as texture, fertilizer, kinds of vegetable, rain and temperature.TIN leaching from farmland of vegetable is researched. Calculate to loss quantity, and discuss fertilizer, rainfall, temperature and else to influences on TIN leaching. The main conclusions can be summed up as followed:The TIN concentration in N1 area is higher than that in N2 area.and The TIN concentration in N2 area is higher than that in N3 area in different fertilizing and...