STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Soil bacteria. Animated coloured scanning electron micrograph (SEM). Bacteria in the soil are directly tied to nutrient recycling especially carbon, nitrogen, phosphorus and sulfur. Bacteria are a major class of microorganisms that keep soils healthy and productive. A teaspoon of productive soil generally contains between one hundred million and one billion bacteria. That is as much mass as two cows per acre. A ton of bacteria may be active in each acre. Bacteria make up both the largest number and biomass (weight) of any soil microorganism.
Model release not required. Property release not required.