Experimental study on the distribution of soil nitrate and ammonium nitrogen under controlled drainage |
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Authors: | Lin Yang Jiesheng Huang Lirong Zhao Zhiqiang Huang |
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Institution: | (1) Department of Irrigation and Reclamation Engineering, University of Tehran, Tehran, Iran;(2) Department of Agronomy, University of Tehran, Tehran, Iran;(3) Department of Irrigation and Reclamation Engineering, Agriculture and Natural Resource Campus, University of Tehran, Tehran, Iran |
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Abstract: | A field experimental project was set up to assess the effects of controlled drainage on the distribution and concentration
of nitrogen in the soil at the Irrigation and Drainage Experimental Station under Four-Lake Engineering Administration of
Jingzhou City, Hubei Province. Two plots drain runoff by controlled drainage system, with an area of 0.1 hm2 (20 m×50 m) each. The third one with an area of 0.04 hm2 (8 m×50 m) has a conventional subsurface drainage system. Under this experimental condition, the study draws the following
conclusions: ① The controlled drainage system has a remarkable effect on the diminishing ratios of nitrate nitrogen between
neighboring layers. It is presented that the diminishing ratio increases with the raising height of drain outlet. Controlled
drainage system also reduces the transference of nitrate nitrogen in topsoil. ② Different from nitrate nitrogen, the concentration
of ammonium nitrogen is stable along the longitudinal section of soil, which is little affected by the controlled drainage
system. It indicates that the concentration of ammonium nitrogen decreases according to the lowering of controlling height
of the drain outlet. |
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