Dynamics of three kinds of nitrogen in surface water of rice field with an independent irrigation system

Abstract

Abstract: Studies on the dynamics of NH₄⁺,NH₃^- and TN concentrations in the surface water of paddy field with an independent irrigation system showed that the concentration of NH₄⁺ and TN in surface water was increased to the maximum after 1day of each urea application,and then decreased rapidly with time.The ratio of NH₄⁺/TN,NH₃^-/TN and(NH₄⁺+NH₃^-)/TN was increased firstly,and then decreased. NH₄⁺ and TN could be used as the main indexes for the water pollution of the paddy field,and NH₃^- used as the assistant one.There existed a positive relation between the concentration of these three kinds of nitrogen and N application amount.Nine days after urea application was the key time to prevent the gross loss of the three kinds of nitrogen in the water surface of the paddy field.The simulation expressions of NH₄⁺ and TN with time factor could be exponential,logarithmic,power or binomial,while NH₃^- had no appropriate expression.The simulation with factors of time and N application amount showed that the simulation expressions of NH₄⁺ and TN were the same.

Key words: Paddy field, NH₄⁺, NH₃^-, Total N, Dynamic feature, Simulation

CLC Number:

X171.1
S158

WANG Qiang, YANG Jingping, CHEN Jun, SHI Hongxing, XU Chunfen. Dynamics of three kinds of nitrogen in surface water of rice field with an independent irrigation system[J]. Chinese Journal of Applied Ecology, 2004, (7): 1182-1186.

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