Downloadable Software 
Corn Yield Probability Calculator This Excel spreadsheet calculates the probability of obtaining a specified corn grain yield at several Great Plains locations based on a userinput value of available soil water at planting and the longterm rainfall record for rain falling between 15 July and 25 August.
Precipitation Storage Efficiency Calculator This Excel spreadsheet calculates the estimated precipitation storage efficiency and stored soil water over the 14month fallow period in a WheatFallow system under either conventional tillage (CT) or notillage (NT) The MultiCalculator is a set of three Excel spreadsheets: Yield Calculator, Water Calculator, and EthanolWater Calculator The Yield Calculator calculates crop yield based on userselected values for Available Starting Soil Water at planting and expected Growing Season Precipitation. The Water Calculator uses the same production functions as the Yield Calculator, but essentially functions in reverse and calculates the amount of water needed to grow a specified yield of a given crop. The EthanolWater Calculator is a specialized version of the Water Calculator that calculates the ratio of gallons of water required to produce a gallon of ethanol from corn grain.
Calculating the N and P availability from composted manure using a decay series 42410 prepared by Dr. Merle F. Vigil USDA ARS
