The Root Zone Water Quality Model (RZWQM) was developed in the early 1990's and was applied in field research to address soil and water management worldwide with 200 publications in the literature. The model is available from USDA-ARS's website and is supported by the Great Plains Systems Research Unit in Fort Collins, Colorado. It has a Microsoft Windows User Interface and the science in RZWQM is documented in a book published by Water Resources Publications in Colorado. Recently, a hybrid model between RZWQM and DSSAT (CROPGRO and CERES plant growth model) was developed and released. The model also has an option to use surface energy balance from the SHAW (simultaneous heat and water) model. Model applications of RZWQM include manure and N management, water management, crop rotation, tile flow, pesticide, and tillage. A demo of the model will be given as well.