The effect of cultivar and soil substrate on tomato yield was studied in an experiment conducted over the years 2004–2006 in an unheated plastic tunnel at the Experimental Station of the University of Warmia and Mazury in Olsztyn. The experimental materials comprised eight tomato cultivars, i.e. ‘Atut F1’, ‘Baron F1’, ‘Bekas F1’, ‘Carmello F1’, ‘Gracja F1’, ‘Ognik F1’, ‘Słonka F1’, ‘Terra F1’, two types of soil substrate purchased from Hollas (peat medium) and hotbed soil. Each year cv. Terra F1 was characterized by the highest total and marketable yields. The soil substrate purchased from Hollas was found to be more suitable for tomato growing than hotbed soil.
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