Soybean is one of he most valuable plants cultivated in the world. Soybean seeds and its products contain fibre, lecithin, vitamins, especially from the B group, mineral elements, isoflavones (genistein and daidzein), phytic acid, proteanase and saponin inhibitors. The object of the studies were the plants of soybean ‘Aldana’ cv. grown from the seeds dressed directly before the sowing with post-culture liquids Pseudomonas sp. Ps 255 and Bacillus sp. B 73. The studies also considered a combination with chemical seed dressing with Zaprawa Oxafun T and a combination without any dressing. The effectiveness of post-culture liquids of antagonistic bacteria was estimated in protecting soybean from soil fungi. Post-culture liquids had a positive effect on the number, health status and yielding of the studied plants. Soybean was mainly infected by Fusarium culmorum, F. oxysporum, Phoma exigua, Rhizoctonia solani and Sclerotinia sclerotiorum. Species Phomopsis sojae was additionally isolated from the infected plants. Those fungi were isolated much less frequently from the plants in combinations with post-culture liquids of antagonistic bacteria than from reference plants. A reverse relation was observed in the case of the occurrence of saprobiotic fungi from genera Gliocladium, Penicillium and Trichoderma.

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