Abstract
Organic waste and sewage sludge were becoming big problems in urban area. Community who live in the city have to buy soil media and compost for farming activities. This study was aimed to determine the effect of utilising sewage sludge and urban organic waste compost for cultivating onion using urban farming system. The experiment factors were sewage sludge and dosage of urban organic waste compost. The results showed that there was no correlation between the both treatment factors. Besides, there was no significant difference for all experimental variables: the treatment of sewage sludge and garden soil as comparisons. Meanwhile, the treatment of urban waste compost dosage had a significant effect on the height of the onion plant, the weight of the harvest, the number of bulbs, and the dry weight of onion. In addition, the treatment of urban waste compost as much as 10%, 20% and 30% was not significantly different from each other. For plants that were given urban waste compost, the plant height was 36-38 cm, harvest weight was 75-92 g/plant, the number of bulbs was 10-12 fruits/plant and the dry weight of onion was 50-60 g/plant.
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