Özet:

Normalization of waters in urban areas produces waste in the form of sedimentary soil mud and water hyacinth plants. Normalization waste is usually piled up at the edge of the water which causes the environment to become slum and unhealthy. This study aims to examine the use of water sedimentary soil to replace garden soil as a planting medium for urban forest plants, and to determine the effect of the giving of water hyacinth biomass compost on urban forest growth. Factorial research with the treatment of the first factor is water/aquatic sedimentary soil, namely T1: garden soil as a comparison, T2: residential sewer sediment soil, T3: highway sewer sediment soil, T4: river sediment soil, and T5:reservoir sediment soil, while the second factor treatment is the amount of water hyacinth biomass compost, namely B0: 0% compost as control, B1: 5% compost, B2: 10% compost, B3: 15% compost, B4: 20% compost and B5: 25% compost. The experiment used a randomized block design repeated three times. The experimental unit was four polybags, each containing one sengon seedling, so that the total experiment was 360 polybags. The results of the study showed that there was no interaction between the treatment factors of the water/aquatic sedimentary soil and the dose of water hyacinth biomass compost. In the treatment of water/aquatic sedimentary soils, there was a significant difference between the treatments, and sedimentary soils originating from the large sewer (highway sewer) were not significantly different from the comparison (garden soil) for all observation variables. The average value of plant height is 8,10 cm with a standard deviation of 2,34, the average value of the number of leaves amounted to 4,33 with a standard deviation of 0,84 and the average value of leaf canopy area equal to 748,14 with a standard deviation of 154,87. In the treatment of the dose of water hyacinth biomass compost, there was no significant difference between treatments for the variable of number of leaves, while for the variable of plant height and leaf canopy area there was a significant difference. The final conclusion from the research is that highway sewer sediment can replace garden soil by the giving of water hyacinth biomass compost equal to 5% as a medium for sengon seedling

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