الفهرس 
Historical reviewOnly 14 pages are availabe for public view
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Abstract
The present study aims to:- 1- Study the role of earthworm (Allolobophora caliginosa) on the decomposition of plant organic matter. 2- Study the influence of the experimental animal on the habitat properties. 3- Study the response of the experimental animal towards toxic stress of lannat and gesaprim on the base of vertical movement. 4- Estimation the physical and chemical analysis during the experiments as : - 1- PH reaction 2- Soil salinity 3- The organic nitrogen content 4- The organic carbon content . Earthworms were collected by digging up soil sample and sorting worms by hand. Alive worms were cultured in the laboratory in a woody box filled with moist soil, mixed with decaying leaves and well decomposed cow manure. the box covered with glass plates to minimize evaporation. Some dechlorinated water was added every two days avoiding dryness and incubated at 25OC. The experiments can be summarized as follows :- The experiment was carried out in three sets each include 27 earthen glazed pot (about 12 cm high and 5 cm lower most diameter and 10 crn upper most diameter). The arrangement of pots in each set was in three rows and labeled each row by a capital letters (A.B.C.) consequently. They assumed nine columns, the first row (A) represents a large worms the secand row (B) have small sized worms and the third row (C) have no worms and serves as control. Pots was filled by about 330 gm of dry mixed soil (mud+sand with different percentage of sand in every pat to give a different soil quality. Five worms of the same size were introduced in each pot. Small quantity of test soil was taken at interval of 2.4 and 6 weeks, and analysed for, PH, salinity, organic nitrogen. and organic carbon . The response of the experimental animal towards toxic stress of lannat and gasaprim on the base of vertical movement. A penta branched an chored tube (3 mm diameter and 35 cm length) was fixed in vertical position at the center of gelvanic cylinder. A glass funnel was attached with the outer end of the tube. Twenty worms were introduced to each cylemder which filled with about 8 kg of dry soil A set of 16 cylender was used for lannat, Gesaprim and water injection. Soil columens were tested after 4 days of injection and the number of worms were counted in each layer.