Simulation processes of growth and development of rice cultivars under nitrogen fertilizer management in paddy field of Guilan using model ORYZA2000

摘要

The model ORYZA2000 is a growth model for lowland rice (Oryza sativa L.) developed by the International Rice Research Institute and Wageningen University. This model has been evaluated extensively in a wide range of environments. The model ORYZA2000 simulates the growth and development of rice under conditions of potential production and nitrogen limitations. Crop simulation models could provide an alternative, less time-consuming and inexpensive means of determining the optimum crop nitrogen requirement under varied nitrogen conditions. In order to evaluated model, an experiment as factorial in RCBD with three replications was conducted during 2009 year in the Rice Research Institute, Iran, and Roudsar, East of Guilan. Factors were cultivar (Khazar, Ali-Kazemi and Hashemi), and nitrogen fertilizer levels (0, 30, 60, and 90 Kg N/ha). Evaluation simulated and measured WLVG, WST, WSO, WAGT and grain yield, by adjusted coefficient of correlation )R2), T test of means p(t), modeling efficiency (EF) and line 1:1. Simulated grain yield value was less than 10 percent of observed data means. Results indicated that, the model ORYZA2000 proved as a useful tool for a rough estimation of grain yield potential in rice cultivars under nitrogen fertilizer management in paddy field of Guilan.