The following information was the before season experiment plan. This experiment consists of two replications with two subsamples in each rep of selected other crops and cover types. Suggested crops are: Corn, Grain sorghum, Soybeans, Sugar beets, Alfalfa, Pasture, and Bare Soil. Plots having planting dates, fertility, irrigation, plant population, etc. typical of the area should be selected. These will most likely be at several locations both on and off the experiment station and may or not all be measured on the same day.