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By Rob Jenkins, C.K. Jain

ISBN-10: 9380179154

ISBN-13: 9789380179155

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Earthworm-services to soil The unpigmented earthworms (no pigment in skin, same colour on the dorsal and ventral parts, pink or slightly brown owing to the soil ingested) that live and feed in the soil are called endogeic earthworms. The effects of earthworms in the soil differ according to the ecological category of the species involved. However, in many agricultural systems there may be only one type of earthworm. As a result of their wide range of adaptations, earthworms have diverse functions in the soil.

Thus, earthworms become a resou rce that can be harnessed to improve ecosystem health. Negative Impacts on Soil Macrofauna In Corrientes Province (northern Argentina), the use of heavy machinery to prepare soil for rice culture has caused soil compaction. This type of soil management has led to 36 Advances in Soil-borne Plant Diseases important changes in soil macrofauna abundance and diversity. After several years of culture, fields are left fallow. During this period, the soils are recolonised by '>oil [etuna.

They construct very large nests and their harvesting may lead to the incorporation of large amounts of organic matter and nutrients into the soil. In some locations, ants may have an important role in bioturbation and add their effects to those of other groups of soil macrofauna. Figure 3. Ant In agriculture, although generally seen as pests, ants may protect crop herbivores such as honeydew-secreting Homoptera or act directly as herbivores themselves. Their beneficial role as effective predators should also be noted.

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Advances in soil-borne plant diseases by Rob Jenkins, C.K. Jain

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