By Rob Jenkins, C.K. Jain
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Jackson, Willic1nL R. 1993. Organic Soil ConditIOning. jackson Research Center, Evergreen, CO. QS7 p. J. Nitzche. RotatIOn periods suggested to help control vegetable diseases. New Jersey Extension Service. 1 p. Logsdon, Gene. 1995. Using compost for plant disease control. Farm Scale Composting. JG Press, Inc. Emmaus, PA. Ozores-Hampton, Monica, H. Bryan, and R. McMillian Jr. 1994. "Suppressing disease in field crops". BioCycle. July. p. 60-61. W. ). 1982. Suppressive Soils and Plant Disease. The American Phytopathological Society.
The following exercises, Exercises 6 and 7, enables participants to classify soil macrofauna, estimate their abundance and observe their effects on the soil, especially on soil structure, porosity and hence water infiltration. BIOGENIC STRUCTURES CREATED BY SOIL MACROINVERTEBRATES Biogenic structures are those structures created biologically by a living organism. They are mainly earthworm casts, termite mounds and ant heaps. The biogenic structures can be deposited on the soil surface and in the soil, and they generally have different physical and chemical properties from the surrounding soil.
Wood feeders: termites feeding on wood and excavating galleries in larger items of woody litter, which may become colony centres. This group also includes termites having arboreal, subterranean or epigeal nests but feeding elsewhere, and many Macrotermitinae cultivating fungus gardens. Soil-wood feeders: termites feeding in highly decayed wood which has become friable and soil-like, or predominantly within soil under logs or soil plastered on the surface of rotting logs or mixed with rotting leaves.
