The Influence of Vermicomposting Technology on Solubility of Eppawala Rock Phosphate

  • S.H.S. Senarathne
Keywords: Vermicompost, Rock Phosphate, solubility, phosphorus


The application of Eppawala Rock Phosphate (ERP) could be an economic alternative to the use of imported phosphorus fertilizer for certain annual as well as perennial crops like coconut in acid soils. But, its low solubility limits direct application. For Vermicomposting technology, which is a biodegradation process of plant and animal waste materials through earthworms, has been tested for increasing the solubility of ERP. Fresh Gliricidia leaves, fresh cow dung and grasses were mixed 1:2:1 ratio as the basic composting mixture and ERP was mixed at the ratio of 10% and 20% to the composting materials. Forty numbers of earthworms were added to each of the plastic containers with the composting mixture, having five replicates per treatment.      

         Addition of ERP in to mixture showed no effect on the multiplication rate of earth worms.  The nutrient availability of compost was measured with time and compared with the control (T1). Each treatment had the similar amount of nitrogen in the system and that indicates the addition of rock phosphate has a minimal effect or no effect on conversion or losses of available nitrogen.  Addition of ERP increased the availability of phosphorus and it was significantly higher in T4 and T3 than other treatments.  Available phosphorus value was significantly increased from 4% (T5 and T6) to 9 % in T3 and T4 treatments. Total potassium content decreased in all treatments compare with control.  Therefore, vermicomposting can be utilized to increase the solubility of ERP while increasing the available phosphorus in the end product.


Anderson, J.M. and Ingram, J.S.I. 1993. Tropical Soil Biology and Fertility. A Handbook of Methods 2nd ed. Wallingford, UK: CABI Publishing, pp 221.

Atiyeh, R.M., Lee, S., Edwards, C.A., Subler, S. and Metzger, J.D. 2000. Earthworm processed organic wastes as components of horticulture potting media for growing marigold and vegetable seedlings. Compost Science and Utilization, 8: 215-223.

Baker, G.H. 1983. Distribution, abundance and species association of earth worms (Lumbricidae) in a reclaimed in Ireland, Holarc. Ecol.6: 74-80.

Bansal, S. and Kapoor, K.K. 2000. Vermicomposting of crop residues and cattle dung with Eisenia foetida. Bio resource Technology, 73: 95-98.

Bhawalkar, U.S. 1990. Bio conservation of wastes into resources, 4th International Symposium on Earth Worms Ecology, June 10-14, 1990 Avignon, France.

Chien, S.H. 1992. Reactions of phosphate rock with Acid Soils of the humid tropics. In. Workshop on phosphate sources for Acid Soils in the Humid Tropics of Asia. RRIM and MSSS, Kuala Lumpur: 18-29.

Dinalankara, D.M.S.K. 1995. Eppawala Phosphate Deposit of Sri Lanka Present status. Soil Biology and Biochemistry 26 (1), 153-163.

Ghani, A., Rajan, S.S.S. and Lee, A. 1994. Enhancement of phosphate solubility through biological process. Soil Biology and Biochemistry, 26(1), 127-136.

Guoxue Li, Zhang, F., Sun Y, Wong, J.W.C. and Fang, M. 2001. Chemical evaluation of sewage composting as mature indicator for composting process. Water Air Soil Sludge Pollution, 132: 333-345.

Hasnah, M. J. and Hassan, H. M. 2008. Waste conversion to vermicast by Eisenia foetida given four types of organic substrates in the natural Malaysian environmental conditions, Journal of Bioscience, 19: 63–72,

Jackson, M.L. 1973. Soil Chemical Analysis (1st Ed), Prentice Hall of India Private Limited, New Delhi, 111-204.

Kale, R.D., Bano, K. and Krishnamoorthy, R.V. 1982. Potential of Perionyx excavatus for utilization of organic wastes. Pedobiologia, 23: 419–425.

Kaviraj, S. and Sharma, S. 2003. Municipal solid waste management through vermicomposting employing exotic and local species of earthworms. Bio resource Technology. 90: 169-173.

Lee, K.E. 1985. Earthworms: Their Ecology and Relationships with Soils and Land Use, Academic Press, London, 411.

Mc Clellan, G.H. 1978. Mineralogy and reactivity of phosphate rock for direct application. Haifa, Isreal, March 20-23, 1978. IFDC publication, IFDC, Muscle Shoals, Alabama, 35660, USA: pp 57-81.

Premarathne, K.P. and Von Fragstein, P. 2002. Influence of straw –composting on the solubility of rock phosphate. Sri Lankan J. Agric. Sci, vol 39: 102-115.

Rao, S., Rao, A.S. and Takkar, P.N.1996. Changes in different forms of K under earthworm activity. National Seminar on Organic Farming and Sustainable Agriculture, India, 9–11.

Reinecke, A.J., Viljoen, S.A. and Saayman, R.J. 1992. The suitability of Eudrilus eugeniae, Perionyx excavatus and Eisenia fetida (Oligochaeta) for vermicomposting in southern Africa in terms of their temperature requirements. Soil Biology and Biochemistry, 24: 1295-1307.

[SAS] Statistical Analysis Systems, 1999. SAS 1, STAT Users Guide, Release, 7.00 Cary, NC: Statistical Analysis Systems Institute, 1028.

Simard, R.R. 1993. Ammonium acetate extractable elements. In: Martin R, Carter S (Eds) Soil sampling and methods of analysis, Lewis Publisher, Florida, USA, 39-43

Singh, C.P., Mishra, M.M. and Kapoor, K.K. 1982. Solubalization of insoluble phosphate by mesophilic fungi. Revued’ Ecologie et de la Biologie du Sol. 19:17-25.

Singh, C. P. and Amberger, A. 1991. Solubalization and availability of phosphorus during decomposition of rock phosphate enriched straw and urine, Biological Agriculture and Horticulture 7, 261-269.

Singh, R.D. and Yadav, D.V. 1986. Evaluation of low grade rock phosphate composted with some agricultural wastes for use in a crop rotation, Agric Wastes, 18(1): 73-79. (Filed Crop Abst. 10(2): 623-1987).
Suthar, S. 2007. Nutrient changes and biodynamics of epigeic earthworm Perionyx excavatus (Perrier) during recycling of some agriculture wastes. Bioresource Technology, 98: 1608-1614

Suthar, S. and Singh, S. 2008. Vermicomposting of domestic waste by using two epigeic earthworms (Perionyx excavatus and Perionyx sansibaricus). International Journal of Environment Science and Technology, 5: 99-106.

Tripathi, G. and Bhardwaj, P. 2004. Comparative studies on biomass production, life cycles and composting efficiency of Eisenia fetida (Savigny) and Lampito mauritii (Kinberg). Bioresource Technology, 92: 275–283.

Walkley, A. and Black, I.A. 1934. An examination of the Degtjareff method for determining soil organic matter and prepared modification of the chronic acid titration method. Soil Science, 34: 29-38.

Wijewardana, J.D.H. 1994. The effect of poultry manure and its chemical constituents on rock phosphate solubility. PhD Thesis, Aberdeen, UK., 2008
How to Cite
S.H.S. Senarathne. (2018). The Influence of Vermicomposting Technology on Solubility of Eppawala Rock Phosphate. CORD, 34(2), 9.