Scraping excess soil from scoop.Scooping - The soil nitrate-nitrogen (NO3-N) is determined by special request. This test is not included with the standard plant elements because nitrate is so mobile in the soil that by the time the client receives the lab results, the nitrate levels in the soil may have already changed. The lab gives a "general" nitrogen recommendation on the soil test reports since, for most crop situations, there is little or no nitrogen left in the soil from the previous year's crop. The nitrate-nitrogen test is for trouble-shooting or research purposes. The samples are transferred into sample extraction containers using a 4 mL volumetric scoop and leveled with a Teflon bar for consistent volume. This represents approximately 5 grams of soil.