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Cover: USDA Agricultural Research Service scientist and technicians from Fort Collins, CO collecting samples from the 0- to 180-cm soil profile after corn harvest for residual nitrogen (N) analyses. Adjusting N fertilizer rates needed for optimum crop yields based on the amount of residual soil N available to the next crop in rotation is critical to improving N fertilizer use efficiency and reducing nitrate N leaching potential. See "Corn Response to Nitrogen Fertilization in a Soil with High Residual Nitrogen," by Halvorson et al., p. 1222-1229. Photo by Ardell D. Halvorson.

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