Received: 12-06-2023 / Accepted: 07-03-2024
The purpose of this study was to determinethe effect offly ash ontheorganic substratesfor growing flower and ornamental plants in order to effectivelyreuse theagricultural and industrialwaste sources. The fly ash was added into rawmaterials toproduce organic substrate at different rates: 5%, 10%, 15% and 20% and incubated by the semi-aerobic method. The results indicated that the organic substrate from agricultural by-products supplemented with fly ash had goodnutritional content, limited presence of E. coliand Salmonella, withneutral pH, and acceptable heavy metal content(notexceeding QCVN 03-MT:2015/BTNMT standard) that ensures the growth and development of flowersand ornamentalplants. The experiment of growing Gerbera jamesoniion organic substrates supplemented with fly ash showed a cleareffect on growth rate, harvested yield, and the number of flowers harvested in the treatment supplemented with 15% fly ash with 1.75 flowers higher than the control without fly ash supplement 40%. Thefly ash rate of 10-15% appeared as appropriate range to add to the compost pile of organic substrates, of which 15% was most efficient for the growth of Gerbera jamesoniiand reduction of expenses during the crop care.