Submitted to: American Society of Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/26/2003
Publication Date: 11/2/2003
Citation: Hu, C., Delgado, J.A., Li, X. 2003. Evaluation of best management practices on n dynamics for a north china plain. American Society of Agronomy Abstracts. 95 CD-ROM.
Interpretive Summary: dsf
Technical Abstract: We need to evaluate the reliability and performance of computer simulation models under different agroecosystems to improve the use of quick assessment tools that can contribute to develop better N management practices (Delgado, 2002). The USDA-ARS NLEAP version 1.2 (Delgado et al., 1998) was tested for surface irrigated corn (Zea mays L.) -wheat (Triticum aestivum L.) systems grown in a North China Plain. The needed data to calibrate and test the model and Best Management Practices (BMPs) was collected, including yield, N uptake, NO3-N leaching with lysimiter cups and other needed data. For these irrigated corn-wheat systems of the North China Plain, initial NLEAP analyses showed that N use efficiency (NUE) can significantly be increased by incorporating urea after surface application on these alkaline soils to reduce NH3 volatilization. Evaluation of BMP showed the need to conduct N management plans that accounts for N budgets including the initial residual soil NO3-N to increase NUE and reduce NO3-N leaching. NLEAP was a tool capable of evaluating the effect of BMP on N dynamics and NUE for these cropping systems of the North China Plain.