What size are iron or manganese nodules or concretions that are significant in soil analysis?

Iron or manganese nodules or concretions that are significant in soil analysis typically have a diameter of about 2 mm. This size is critical because these nodules can influence various soil properties, including drainage, aeration, and nutrient availability. At approximately 2 mm, these structures are large enough to be accurately identified during a soil analysis process, allowing researchers and agronomists to assess soil health and fertility effectively. Nodules at this size can also impact the broader soil ecosystem, influencing microfauna and chemical interactions, making them important indicators in soil studies. Additionally, recognizing the significance of this specific size assists in standardizing soil sampling and testing procedures for accurate data collection.