Furthermore, concentration and composition of hydrocarbons, nutrients, oxygen, moisture and temperature control the rate of degradation [7][8][9][10] and [11]. However, the process of biodegradation can be accelerated in the presence of nutrients such as nitrogen, potassium, phosphorus etc. In many cases these nutrients are supplied in
chemicals via fertilizers which in many occasions are easily washed away after a heavy rainfall . The process of bio-remediation using water hyacinth grass Eichorniacrassipes) as a nutrient source (bio-fertilizer), offers an alternative measure which would not only be effective in the regeneration of the site and affordable but, in addition encourage local participation in clean-up programs because it is environmentally friendly . This research work investigated on the possibility of using water hyacinth as a source of nutrient in bioremediation process of soil contaminated with heavy crude oil and also the possibility of it serving as a soil conditioner .
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