SURVEY OF SOIL MICROFUNGI IN RELATION TO EDAPHIC CHARACTERISTICS IN SELECTED RICE ADDIES OF THE PROVINCE OF ALBAY, ISLAND OF LUZON, PHILIPPINES

Jonathan Jaime G Guerrero, Daryl B Alfante

Abstract


 Soil fungi are a part of the normal microflora and are major actors of the nutrient cycle in the ecosystem. Their diversity is a good indicator of soil health especially in agriculture. In this study, the fungal abundance of rice paddy soils in nine towns and eighteen barangays in the province of Albay have been investigated in relation to edaphic characteristics including pH, nitrogen, phosphorus and potassium levels, organic matter, moisture content, carbon-nitrogen ratio and soil texture. Soil samples were taken from a depth of 15 centimetres from the surface. Composite soil samples were divided into two sub-replicates for soil analysis and soil plating techniques. Fungal population was expressed in colony-forming units per gram of soil. Identification of soil fungi employed the use of available taxonomic keys. Colony-forming units from different sampling sites were significantly different from one another. A total of 117 isolates were obtained belonging to seven (7) genera and twenty three (23) species. These are the following: Aspergillus (A.flavus, A.fumigatus, A.nidulans, A.niger, A.oryzae, A.parasiticus, Aspergillus sp., A.tamarii, A.terreus, A.ustus, A.versicolor), Botrytis (B. cinerea), Byssochlamys (B.fulva), Mucor (M.racemosus), Fusarium (F. acuminatum), Penicillium (P.glabrum, P.funiculosum, P.nalgovienze, P.rugulosum, P.variabile),and Trichoderma (T.harzianum, Trichoderma sp., T.viride). Fungal population increased as pH, organic matter and moisture content values increased while a clayey soil texture held the most CFU/g of soil. Microfungi and edaphic characteristics are, therefore, linked and affect each other. Further studies are recommended to test individual potentials of the Microfungi in many applications such as biocontrol and bioremediation.


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Bicol University
Research and Development Center
Legazpi City