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Fungal Populatlon of Some Crop Field Soils

M. Mahboob Hossain
Department of Plant Pathology, Bangladesh Agricultural University

M. A. Wadud Mian
Department of Plant Pathology, Bangladesh Agricultural University

Abstract/ Executive Summary:

Estimated fungal populations in soils from potato, sweet potato, tomato, bean, cabbage and papya fields showed 34,625, 37,250, 50,375, 37,625, 46,813 and 44.000 colonies of dry soil, respectively, in potato dextrose agar medium and the corresponding figures obtained for peptone dextrose agar medium were 45,000, 53,375, 68,626, 135,625, 100,260 and 99,375. Significant differences in levels of fungal population among the fields indicated influence of crop sequence on build up of fungal population. Relatively higher recovery of fungi from bean field soils strongly suggested that bean root secretions enhanced rhizosphere fungal population. Maximum number of sclerotia of Sclerotium rolfish was recovered from potato field soils followed by cabbage, tomato, sweet potato, papaya and bean fields. High sclerotial population in potato, cabbage and tomato fields was due to continuous cultivation of crops susceptible to S. rolfish.

Keywords: Fungal, Soil, Crop

Location: Department of Plant Pathology, Bangladesh Agricultural University

Start Date:

End Date:

Program Area: Pest Management

Commodity: Diseases and insects

Objectives:

To obtain some preliminary information on population levels of fungi occurring in soils under different crops.

Methodology:

Soil samples were collected from six different crop fields (potato, tomato, cabbage, papaya, sweet potato and bean). Four composite samples were collected from each field with a 10 cm, auger to a depth of 15 cm, Fungal populations were estimated by dilution plate method preparing soil dilution of 1:5000. Each of the composite samples was divided into two sub-samples and the diluents were plated in two culture media [acidified potato dextrose agar (PDA) and peptone dextrose agar modified with rose bengal and streptomycin (PDR)]. Population of fungi per gram of soil on dry weight basis was estimated by multiplying the number of colonies observed by the dilution factor. Distribution of sclerotia of Sclerotium rolfish Sacc. was determined.

Source of Information: Bangladesh J. Agril. Sci. 2 (2) : 136-139: 1975

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Relatively higher recovery of fungi from bean field soils strongly suggested that bean root secretions enhanced rhizosphere fungal population. Maximum number of sclerotia of Sclerotium rolfish was recovered from potato field soils followed by cabbage, tomato, sweet potato, papaya and bean fields. High sclerotial population in potato, cabbage and tomato fields was due to continuous cultivation of crops susceptible to S. rolfish.

Knowledge Management: Journal