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Calibration and Evaluation of CERES Rice Model under Different Nitrogen- and Water-Management Options in Semi-Mediterranean Climate Condition

Amiri, E., Rezaei, M., Bannayan, M., Soufizadeh, S.
Communications in soil science and plant analysis 2013 v.44 no.12 pp. 1814-1830
biomass, climate, correlation, demonstration farms, field experimentation, grain yield, irrigation management, models, nitrogen, nitrogen content, rice
The objective of this study was the evaluation of the CERES rice model under different nitrogen- and water-management conditions in northern Iran. A 3-year field experiment was conducted at the experimental farm of the Iranian Rice Research Institute in Rasht, Iran, from 2005 to 2007. The experiment was established in a split-plot design with three irrigation regimes (continuous submergence, irrigation at 5-day intervals, and irrigation at 8-day intervals) as the main plot, four nitrogen levels (0, 45, 60, and 75 kg N ha⁻¹) as the subplot, and three replications. Evaluation simulated and measured grain yield, total crop biomass, N content of grain, and crop biomass by adjusted coefficient of correlation and by absolute and normalized root mean square errors (RMSE). Results showed that predicted grain yields agreed well with observed yields (RMSEₐ = 297 and RMSEₙ = 8%). Simulated and observed total dry-matter yields were also in reasonable agreement (RMSEₙ = 862 and RMSEₙ = 10%). Observed and predicted N uptake by rice showed good agreement. The CERES rice model can be applied to research purposes (irrigation and nitrogen) under northern Iranian conditions.