Seasonal Fluctuation Of Non-Rhizosphere Soil Fungi In Wheat Fields In Egypt

Abstract

The study aims at intensive survey of fungal floras of non-rhizospheric soil in wheat fields in El-Minya Governorate over the periods December 1976 - May 1977 and December 1977 - May 1978. At 28°C, using 1% glucose-Czapek's agar the soil samples were rich in fungal population during May 1977 and 1978. Also the periods of February 1978 and December and April 1977 showed fairly high fungal population. These high fungal counts were mainly contribution of Aspergillus. The most frequent species were A. niger. A. terreus. A. fumigatus. A. flavus. A. versicolor, Humicola grisea, Fusarium so/am. F. oxysporum. Trichoderma viride and Stachybotrys chartarum. On 50% sucrose-agar the highest fungal counts were recorded during May and April 1978. A. niger. A. terms. A. fumigatus. A. flavus, A. chevalieri. A. sydowii, P. lilacinum. P. citrinum. P. chrysogenum. P. cyclopium, P. jensenii. P. nigricans, Epicoccum purpurascens. Humicola grisea. Fusarium so/an/. Stachybotrys chartarum and Scopulariopsis brevicaulis were the most common species. At 45°C, on both media, the highest counts were recorded in March and January 1978. These high fungal populations were basically contributed by Aspergillus. The most frequent species on 1% glucose agar were A. niger. A. fumigatus, A. terreus. A. flavus, E. purpurascens. S. brevicaulis and H. grisea var. thermoidea.