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Field and laboratory studies on the activities of two species of tropical earthworms
(1) Investigations were made on the activities of tropical earthworms found in grassland soil in Nigeria, West Africa. (2) Two main species were found, Hyperiodrilus africabus Beddard and Eudrilus eugeniae (Kinberg), confined to soil in shaded and open grassland respectively. (3) Hyperiodrilus produced funnel-shaped·surface casts and Eudrilus mound-shaped casts. (4) About 70 tons of surface casts/acre/year are produced by each species. (5) Casting·was limited to the wet season, lasting from May-October. Worms did not cast on artificially moistened soil, either before or after the wet season. (…
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