Suitable quantity of urban sewage sludge for nursery material and heavy metal accumulation in some seedlings
2001
Thaviroj Tunnukit
Top soil usually use for nursery material which cannot provide any longer. The new alternative of nursery material for substitute or reduce top soil is, therefore necessary. Urban sewage sludge as by product of waste water treatment system is properly an organic material that need to manage. In an alternative of the management was the utilization of nutrient source from the sludge for nursery material by limiting of heavy metals concentration at save dose is contemplative option. The goal for this study was to find a suitable quantity of urban sewage sludge for nursery seedling and effect of the sludge on heavy metal accumulation in seedling. This experimental design was 2 factorial combination with 3 replication. The factors were three seedlings (Acacia mangium Wild., Pterocarpus macrocarpus Kurz. and Afzelia xylocarpa Craib.) and six treatments (control, fertilizer, sludge application quantity at 3.9, 6.6, 9.3 and 11.9 grams/unit). The time in this study was 4 months and the heavy metal that study was the total form of cadmium, copper, manganese, nickel, lead and zinc in nursery material and seedling. The results showed that suitable quantity of urban sewage was 11.9 grams/unit (265 grams nursery material mixed with soil and chaff-ash = 1:1 by volume) for this seedlings and the 4 urban sewage sludge application quantity had no possibly harmful effect of heavy metals (cadmium, copper, manganese, nickel, lead, zinc) on seedlings.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
