International Potash Institute
Interactive Tools: Calculators, Decision Support Systems and Models

The Nutrient Management Decision Tools are a collection of resources designed by IRRI for:

• Extension and Farmers
• Researchers and Scientists
• Educators, Trainers and Students

The tools will help users to develop location specific nutrient management guidelines for rice.

http://beta.irri.org/index.php/nmrice

The Nutrient Decision Support System (NuDSS) for irrigated rice is part of an initiative by the Irrigated Rice Research Consortium to provide decision support on site-specific nutrient management (SSNM) in the irrigated lowlands. It is a software program used to estimate the nutrient requirements for realistic target yields in irrigated rice, select the adequate and least costly combination of quality fertilizer sources to match the nutrient requirement, decide on fertilizer split applications, and estimate the profit gained from improved nutrient and crop management programs.
http://seap.ipni.net

This model simulates the growth response of 13 crops to applications of potassium fertilizer.
The model is complete with graphical output.
This on-line dynamic model will deliver your results in a few seconds.
Models are also available for Nitrogen and phosphate.
www.qpais.co.uk

The Nutrient Expert for Hybrid Maize is a new, computer-based decision support tool developed by IPNI, with financial support from IPI. The software assists local experts quickly formulate fertilizer guidelines for tropical hybrid maize based on the principles of site-specific nutrient management (SSNM).
http://seap.ipni.net