DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Organic humus (soil compost); decaying plant materials, some mineral particles, coloured scanning electron micrograph (SEM). Humus it a part of soil organic matter that forms in the soil when plant and animal matter decays. It contains many important nutrients that are needed for other plant growth. Humus influences the overal density of soil and plays and important part in moisture and nutrient retention. Nitrogen is one of the most important components of humus. Magnification: x23 when shortest axis printed at 25 millimetres.
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