Chemical analyses of feedlot soil profiles showed the presence of high exchangeable K+in the surface of the feedlot profile, which differs greatly from that of adjacent cropland. The K+originated from plant material being fed to the animals. Potassium comprised more than 75 percent of the exchange capacity in this zone. Evidence suggests that K can cause deterioration of the soil physical properties. Low NO3-N below 15 cm demonstrates the lack of water movement through the feedlot surface, the presence of reduced conditions, or both.