Abstract
Summary Yeast densities in soil and rhizosphere of different crops ranged from 10 to 8.6 × 104 cells/g, depending on the physicochemical conditions of the soil. Population density correlated significantly with the organic carbon and organic nitrogen content of the soils tested. Except in few cases, the stimulating effect of plant roots was observed, and yeast counts in the rhizosphere of 26 tested plants were 2–15 times those in the corresponding root-free soils. Yeasts isolates (153), obtained from different soils and rhizospheres, were identified as: Cryptococcus albidus (58), Crypt, diffluens (10), Candida curvata (12), C. humicola (5), Rhodotorula glutinis (43), Torulopsis famata (9), T. aeria (2), Debaryomyces hansenii (3), Deb. kloeckrii (10) and Saccharomyces rosei (1).
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