3. Results• Plant Mineral Nutrient and Heavy Metal Concentrations of Water Hyacinth Compost, Field Soil and Irrigation Water All the heavy metals (Zn, Cu, Pb and Ni) tested for were found present in water hyacinth compost and soil sam-ple (Table 1). Zn was the most abundant heavy metal in compost and soil samples (Table 1). Soil samples from the experimental site had some amounts of all the other metals tested. The four heavy metals analyzed in the re-search (Zn, Cu, Pb and Ni) were not detected in the irrigation water (Table 1).
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