Agburu EO (2012). The effect of earthworm on properties of soils

Amakiri JO, Onofegara FA (1983). Effect of crude oil polluted on the growth of maize, okra, and pepper. Petrochem. J. 2(4):199-205.

Ansari AA (2011). Worms powered environmental biotechnology in organic waste management Int. J. Soil Sci. 6:25-30

Arunkumar A (2007). Effect of different levels of NPLC on growth and yield parameter of sweet corn Karnaka J. Agric. Sci. 20(1):41-43.

Atiyeh R, Lee S, Edwards C, Arancon Q, Metzger J (2002). The influence of humic acids derived from earthworm processed organic wastes on plant growth. Bioresour. Technol. 84(1):7-14.
Crossref

Bahman E, Daniel G, John EG (2004). Residual effects of manure and compost application on corn production and soil properties, Agron. J. 96:442-447.
Crossref

Bertin Yang X, Waston LA (2003). The role of root exudates and allele chemicals in the rhizophere. Plant Soil 256:67-83.
Crossref

Bremner JM, Mulvancy CS (1982). Nitrogen total: In method of soil analysis part 2, American Society of Agronomy, Madison, WI. pp. 595-624.

Degong E (1990). The effect of crude oil spill on cereals, Environ. Pollut. 22:187-196.
Crossref

Dutta AC (2005). Botany for degree students, Oxford, New Delhi. pp. 220-233.

Edward CA (1998). The use of earthworm in the break down and management of organic wastes: In Earthworm ecology, CA Edwards (ed), CRC, Press Boco Roton, FL pp. 327-254.

Edward CA, Bohlen PJ (1996). Biology and Ecology of Earthworms, 3rd edn Chapman and Hall, London. 426p

Epstein E, Bloom AJ (2004). Mineral nutrition of plants, principles and perspectives 2nd edn Sinauer associates Sunderland MA ISBN 0-87893-472-4.

Fragoso C, Brown GG, Patron JC, Blanchard F, Lavella P, Pashanasi B, Kuma TC (1996). Agricultural intensification, soil biodiversity in tropics: The role of earthworms. Appl. Soil Ecol. 6:17-35.
Crossref

Ferguson B (1984). Calcium in plant senescence and fruit ripening. Plant Cell Environ. 7:477-489.
Crossref

Glenn GM, Read ASN, Poovaiah BW (1988). Effect of calcium on cell structure, protein phosphorylation and protein profiles in senescing apples. Plant Cell Physiol. 29:565-572.

Goldsmith W, Silva M, Fischenich C (2011). Determining optimal degree of soil compaction for balancing mechanical stability and plant growth capacity. ERDCTN- EMRRP-SR 26.

Grayston SJ, Wang S, Campell CD, Edward AC (1998). Selective influence of plant species on microbial diversity in the rhizosphere soil, Biol. Biochem. 30:369-378.
Crossref

Greenland DJ (1981). Characterization of soils. Oxford University Press, NewYork. 5p.

Kavamura VN, Esposite E (2010). Biotechnology strategies applied to the decontamination of soil polluted with heavy metals. Adv. Biotechnol. 28:61-69.
Crossref

Kostreba L (1999). The remediation technique of crude oil polluted soil using organic materials for crop production: In proceedings of oil spill conference, American Petroleum Institute Washington DC. pp. 40-41.

Kundu NK, Ghose MK (1997). Soil profile characteristics in Rajmahal coalfield area. Indian J Soil Water Conserv. 25(2):110-113.

Lavelle P, Martin (1992). Small scale and large scale effects of endogeic earthworms on soil organic matter dynamics in soils of the humid tropics. Soil Biol. Biochem. 24(12):1491-1498.
Crossref

Lone MI, He Z, Stoffela PJ, Yang X (2008). Phyto-remediation of heavy metal polluted soils and water progress and perspectives. J. Zhejiang Univ Sci. B. 9:210-220.
Crossref

Mbah CN, Ezeugwu G, Anikwe MAN (2001). Effect of poultry droppings on soil physical properties and heavy metals uptake by maize plant. J. Agric. Food Technol. Environ. 1(1):119-122.

Mbagwu JSC (2003). Aggregate stability and soil degradation in tropics, paper presented at 2003 College of Soil Physics, ICTP Trieste Italy.

Mclean EO (1982). Soil pH determination: In Pase DL (ed). Methods of soil analysis part 2, Chemical Analysis Agronomy Series, No. 9, ASA, SSA, Madison WI, USA.

Muller WR, Donahue RL (1992). Soils: An Introduction to soils and plant growth, Prentice Hall India, New Delhi-11001. pp. 226-420.

Munnoli PM, Jaime A Teixeira da silva, Saroj Bhosle (2010). Dynamics of the soil – earthworm-plant relationship. A review. Dynam. Soil Dynam. Plant 4(1):1-21.

Nelson DW, Sommers LE (1982). Total organic carbon and organic matter: In Page CA, Miller RH, Keeny DR (eds). Method of Soil Analysis part 2, 2nd edn. Agronomy Monograph No. 9, ASA and SSSA, Madison, WI. pp. 539-579.

Nweke IA (2013). Plant nutrient release composition in vermicompost as influenced by Eudrilus eugenae using different organic diets. J. Ecol. Natur. Environ. 5(11):346-351.
Crossref

Odu CTI (1980). Degradation and weathering of crude oil under tropical conditions: In proceedings of a seminar on the petroleum industry. Nig. Environ. V1:143-152

Odu CTI (1981). Petroleum industry and Nigeria Environment: In proceedings of a seminar on the petroleum industry and Nigeria environment held in Port Harcourt, River State, 1986.

Ogboghodo AE, Osemwota IO, Choker JU (2001). An assessment of the effect of crude oil pollution on soil properties, germination and growth of Maize (Zea mays L.) Two crude oil types Forcados light (UQCC) and Escravos light (Chevron): In Proceedings of Annual Conference, SSSN, held at University of Calabar, Nigeria, March, 2001. pp. 299-300.

Okere JU, Akamigbo FOR, Ufot UO (2001). The effect of local mining on soils around Enugu, Nigeria, 27th annual Conference of Soil Science Society of Nigeria (SSSN). pp. 291-299.

Parthasarathi K, Ranganthan LS, Anandi V, Zeyer J (2007). Diversity of micro flora in the gut, and casts of tropical composting earthworms reared on different substrates. J. Environ. Bal. 28:87-97.

Paterson E (2003). Importance of rhizodeposition in the coupling of plant and microbial productivity. Eur. J. Soil Sci. 54(4):741-750.
Crossref

Pinstrup AP, Lorch FP (2001). Prospective on overcoming hunger, poverty and environmental degradation International Food Policy Research Institute, Washington DC. pp. 310-315.

Ratty M, Hutha V (2004). Earthworm communities in birch stand with different origin in central Finland. Pedobiologia 48(1):283-291.
Crossref

Rovira AD (1969). Plant root exudates. Bot. Rev. 35(1):35-57.
Crossref

Rowell MJ (2003). The effect of crude oil spills on soils in the reclamation of agricultural soil after oil spills. University of Alberta Press, Edmonton. pp. 32-33.

Samarayake JWK, Wijekoon S (2010). Effect of selected earthworms on soil fertility, plant growth and vermicomposting. Trop. Agric. Res. Extens. 13(2):33-40.

Sawar G, Hussain N, Schmeisky H, Muhammad S, Ibrahim M, Safdar E (2008). Improvement of soil physical and chemical properties with compost application in rice-wheat cropping system. Pak. J. Bot. 40:275-282.

Scheu S (1997). Microbial activity and nutrient dynamics in earthworm cast (Lumbricidae). Biol. Fertile Soils 50:230-234.

Sinha RK, Aganwai S, Chauhan K, Valani D (2010). The wonders of earthworms and its vermicompost in farm production: Charles Darwin's friends of farmers' with potentials to replace destructive chemical fertilizers from agriculture. Agric. Sci. 1:76-94.
Crossref

Shell Petroleum Development Company (1998). Environmental devastation, SPDC Publishers, Warri, Nigeria.

Steel RG, Torrie JH (1980). Procedure of statistics. A biometrical Approach 2nd edn. McGraw-Hall, New York. pp. 633-690.

Tel DA, Rao R (1982). Automated and semi-automated method for soil plant analysis, Manual Series No.7, IITA, Ibadan.

Tisdale SL, Nelson WL, Beaton JD, Halin JL (1993). Soil fertility and fertilizers 5th edn Prentice Hall Inc. Upper Saddle River, New Jersey 07458, USA. pp. 45-561.

Toutain F, Villemin G, Albrecht A (1982). Ultra structural study of biodegradation processes, 11 Enchytraeids-leaf litter models. Pedobiologia 23:145-156.

Tremblay LK, Levy EM (1993). Bioremediation application of slow release fertilizer on low energy share lines: In Proceedings of oil spill conference, American petroleum Institute, Wessington, D. C. pp. 499-500.

Ufot UO, Akande O (2005). Soil survey of Mkpat Enin FADAMA soils, Akwa Ibom State of Nigeria for food productions: In proceedings of the 30th Annual Conference of the SSSN, University of Agriculture Makurdi, Nigeria. pp. 18-20.

Verma D, Shweta (2011). Earthworm resources of western Himalayan region. Indian Int. J. Soil Sci. 6:124-133.
Crossref

White RE (1979). Introduction to the principles and practices of soil science, Blackwell Scientific publication, Oxford London p. 417.

Zang BG, Rouland C, Lattand G, Lavelle P (1993). Activities of digestive enzymes in gut of the tropical earthworm Pontoscolex corethrus. Eur. J. Soil Biol. 29(1):7-11.