EN
Experiment with pot-grown tomato ‘Admiro F1’ was carried out in 2011. Tomatoes were grown in the substrate with peat and compost soil infected with following pathogens: Pyrenochaeta lycopersici, Fusarium oxysporum f. sp. lycopersici, and Phytophthora parasitica var. parasitica. Some plants were treated with 1% of liquid potassium silicate Silvit (150 g SiO3 per 1 dm3), two times per 0.5 dm3 per plant. The yields of plants treated with silicon were better than in control, but more fruit with blossomend rot were indicated. These plants and their roots were significantly healthier than in control. Poor yielding and plant vigour in control plants was connected with root infection by identified pathogens.