The majority of samples processed are in support of the soil survey program but samples are also run on a cost basis for other universities, public and private industry, and individuals. Yield Variability Relationships to Soil Map Unit. This study is being conducted in conjunction with the National Soil Tilth Laboratory . Known standards are run every ten to twenty samples to ensure accurate procedure is followed. Requires at least 10 grams air-dry soil.
Results yield percent sand, coarse silt, fine silt, and clay.
Results yield percent very coarse, coarse, medium, fine, and very fine sand. Total Carbon and Total Nitrogen - Dry Combustion method. Soil total carbon and nitrogen can be determined simultaneously from the same sample. Requires soil to be air-dried and finely ground to pass through a 100 mesh sieve. Results are normally reported in percent total carbon and percent total nitrogen.