shows the physiological effects of compost on the observed growth parameters of Kenaf plant. There was a steady growth in leaf length, leaf breadth and stem height of H. cannabinus from week 1 to week 4. The stem thickness showed a slight increment in width during the four-week experiment. The leaf length and breadth increased by two times while the leaf height increased by 3 times. This shows the evidence of nutrient quality and low phytotoxicity of the compost used for the bioremediation experiment. The low phytotoxic nature of compost was exhibited in the low values of bioaccumulation factor and increased growth parameters. The response of Kenaf plant to various growth parameters in terms of nutrient quality and low phytotoxicity of the compost suggested that composting, if properly made is promising for organic agriculture.
The present study is consistent with previous works on effects of compost on physiological parameters of plants [31,55,59]. The study of Mrabet et al. [59] revealed that incorporation of com-post into soils where maize and lettuce were planted resulted into increase in plants parameters including number of leaves, width and length of leaves, number and weight of seeds/fruits.