Abstract
The water balance corn yield model was made user friendly by adapting it to an Excel spreadsheet. Instead of more direct evapo-transpiration measures, the model utilizes readily available input proxies of maximum daily temperature, rainfall and plant-available stored soil moisture at planting. Maximum daily temperature averaged for each week and total weekly precipitation are used for 10 weeks with 6 weeks before and 4 weeks after tasseling (anthesis). Plant available stored soil moisture at planting is a soil quality factor. High-yielding Midwestern Corn-Belt soils store 10 inches or more of plant-available stored soil moisture at planting. The model has been successfully used to forecast corn yields for individual fields as well as for entire states of Illinois, Iowa, Indiana, Kansas, Michigan, Minnesota, Missouri, Nebraska, Ohio, South Dakota, and Wisconsin for 2001-2005. Model forecasted yields are updated weekly during the growing season as each week of the previous year's weather is replaced with actual weather. Final forecasted yields are available 4 weeks after tasseling. The model compares the current year's weather and yield forecast to the previous year's actual weather and yield. Individual farmers, advisers and scientists will find the model useful in forecasting yields in their own fields.
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