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fall 2003 the ecological landscaper newsletter

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The Newsletter of The Ecological Landscaping Association Vol. 10, No. 3 Fall 2003 The soil food we b WHA T IS THE SOIL FOOD WEB? L ife in the soil takes a multi- tude of forms, most of which are undetectable by the unaided eye. These forms range in size and kind from microscopic one-celled bacteria, algae, fungi, and protozoa, to larger nematodes, anthropods, earthworms, insects, plant roots, and small ani- mals. These make up the community called the soil food web. The soil organisms decompose organic matter , recycle nutrients and energy , and aid in the formation of humus. They convert nutrients into forms plants can use. In fact, all plants— grass, trees, shrubs, and agricultural crops—depend on the soil food web for their nutrition. In turn, plant roots exude sugars and simple proteins that feed bacteria and fungi. WHY IS THE SOIL FOOD WEB IMPORTANT? The soil food web performs an amazing number and variety of functions that contribute to soil quality, plant health, and the cycles that allow life of earth to exist. The great majority of soil organisms are  beneficial or benign to plant life. The relatively few soil organisms that create problems in the landscape are Web continued on next page  within: Editor’s two cents. . . . . . . . . . 2, 8 Build ing soil sy stems . . . . . . . . 3 Saving dirt. . . . . . . . . . . . . . . . . . 5 Nitr ogen in the soil . . . . . . . . . . 6 Humus . . . . . . . . . . . . . . . . . . . . . 7 ELA news. . . . . . . . . . . . . . . . . . 1 0 Conference . . . . . . . . . . . . . . . . 11 Glean ings . . . . . . . . . . . . . . . . . 17 Resources. . . . . . . . . . . . . . . . . . 18 Events. . . . . . . . . . . . . . . . . . . . . 19 Unclassifieds. . . . . . . . . . . . . . . 20 The following is excerpted from the first installment of the Ecological Landscaping Association’s Guide to  Healthy Landscapes, Chapter 4, Developing Healthy Soil. Energy flows in direction of arrows. Lengths of organisms given in millimeters (25mm=1") 1° = First-level consumers 2° = Second-level consumers 3° = Thir d-level consumers Illustration modified from D.L. Dindall, 1978 ▲ Soil organisms and their role in decomposing residues Celebrating our 10th  anniversary  year 

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