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Articles by W.A. Ismail
Total Records ( 1 ) for W.A. Ismail
  L.C. Ng , W.A. Ismail and M. Jusoh
  Background and Objective: Roselle (Hibiscus sabdariffa L.) is an important crop used in confectionery, cosmetic and pharmaceutical industries and vascular wilt caused by Fusarium oxysporum is the obstacles in roselle production. Compost has been use to control disease infection in various crops through several suppression mechanisms. However, the bio-efficacy of agro-waste compost in suppression of F. oxysporum in roselle is still unknown. The aim of this study was to evaluate the bio-efficacy of agro-waste compost that would be potential soil suppressive amendment to control F. oxysporum of roselle. Materials and Methods: Three types of agro-waste composts: Vermicompost, crop residue and horse manure compost were used in this study. The direct suppression effects of compost and compost extract on the growth of F. oxysporum were determined. The total microbial population in compost was also evaluated. Results: Generally, the non-sterilized agro-waste compost shown prominent suppressive effects on mycelial growth of F. oxysporum over sterilized compost. Similar results were observed when non-sterilized agro-waste compost extracts at 5, 10, 25 and 50% concentrations were used to suppress the growth of F. oxysporum. Non-sterilized horse manure compost extracts significantly inhibit in vitro mycelial growth of F. oxysporum with 70.84%. The total microbial activity in vermicompost was recorded significantly high with 6.46 μg/mL/0.5 h. However, the total microbial activity in vermicompost was not associated with the suppression effect against F. oxysporum. Conclusion: The suppression activities of compost against F. oxysporum was mainly caused by the biotic factor. However, the total microbial activity in agro-waste compost is not sorely contributed to the suppressive activity against F. oxysporum. The present of the strong antagonist in the non-sterilized agro-waste compost was the key factor to explain the high suppressiveness of the horse manure compost. Whereas, the abiotic factor involved indirectly influent the compost property and the colonization ability of the microorganisms. All composts used have potential to suppress the growth of F. oxysporum, especially the non-sterilized agro-waste composts have higher potential to be developed as soil suppressive amendment against F. oxysporum.
 
 
 
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