Journal of Food, Agriculture and Environment

Modeling cumulative dynamics of ammonia volatilization at seedling stage from direct seeding rice fields with different nitrogen managements 

Author(s):

Lin Xian Liao ^{1, 2}, Junzeng Xu ^{1, 2}*, Xiaohou Shao ^{2, 3}, Tao Wen ^{2, 3}

Recieved Date: 2012-06-30, Accepted Date: 2012-10-04

Abstract:

Three statistical models, the first order kinetic equation, the Velhost logistic equation and the sigmoidal logistic equation, were evaluated for simulation of cumulative dynamics of ammonia volatilization (AV) losses from direct seeding rice (DSR) fields with different nitrogen (N) regimes. Results indicate that N fertilizer types and placement methods lead to change in AV cumulative dynamic patterns. Ammonium bicarbonate (AB) leads to much higher and more rapid AV losses than urea(U) and control released urea (CRU), and surface placement leads to much higher and more rapid AV losses than deep placement for all the treatments. The most suitable management is deep placement of CRU for basal N application in DSR paddies. The first order kinetic equation was feasible only for the AB surface placement treatment. The Velhost logistic equation was incompetent due to deviation from observed results in the peak AV values and times acquired peaks. The sigmoidal logistic equation is the best one for cumulative AV loss simulation in the three equations for all N regimes except the AB deep placement treatment. 

Keywords:

Ammonia volatilization, direct seeding rice, deep placement, cumulative dynamic model

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 3&4
Category: Environment
Pages: 1413-1418

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