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Many studies have been made, and continue to be conducted, to determine infiltration rates and sediment production on rangelands. Most of these studies use small sample plots (<2 m2). This study determined the number of sample plots required to achieve confidence intervals of ?10, ?20 and ?30% of the sample mean at 80, 90, and 95% probability levels. For 80 and 90% probability levels, 20% of the mean could be achieved with 1 to 5 plots for infiltration rates, and as low as 1 or as many as 263 plots for sediment production. For dry soil moisture conditions, infiltration rates could be estimated with 4 or 5 plots, with 10 to 12 plots needed for field capacity conditions to achieve 10% of the mean with 95% confildence. Achieving 10% of the mean with 95% confidence was not considered practical for sediment production.

Plot Numbers Required to Determine Infiltration Rates and Sediment Production on Rangelands in South Central New Mexico