Nutrient Decision SupportSystem (NUDSS) for irrigated rice

The Nutrient Decision Support System(NUDSS) for irrigated rice is part of IRRI's initiative to provide decision support for site-specific nutrient management (SSNM) in the irrigated lowlands. The content of the software is consistent with printed information on SSNM provided by a field handbook (Dobermann andFairhurst 2000) and a pocket guide(Fairhurst et al 2002). The NUDSS adds value to these materials by combining various models into one user-friendly software package to help users develop improved fertilizer strategies that aim at efficient fertilizer use and increased farmers' profit. The software was developed recognizing the need for decision aids providing assistance in complex mathematical calculations (e.g., through optimizationroutines) that would be difficult to perform otherwise.