This study was conducted to introduce organic greenhouse tomato production by comparing different organic fertilizers during the autumn and spring seasons of 2001 and 2002. The tested fertilizers were (1) poultry manure, 30 tons ha(-1), (2) farmyard manure, 30 tons ha(-1), (3) farmyard manure, 50 tons ha(-1), and (4) commercial (biofarm) organic manure, 2.5 tons ha(-1). Seedlings of tomato cultivars Beril 7314 and Celeya were planted on 31 August 2001 and 13 March 2002, in the autumn and spring season production, respectively. The highest total yield (7.48 kg m(-2)) was obtained from commercial (biofarm) organic manure, 2.5 tons ha(-1) in autumn, whereas in spring season total yields did not differ statistically significant according to the organic fertilizers and the average total yield was between 9.37 and 10.67 kg m(-2). During the harvest period, fruit samples were taken twice and analysed for their quality (total dry matter content, total soluble solids, titratable acidity, pH and vitamin C). Beside the yield and fruit quality parameters, soil properties and leaf nutrients of each treatment are presented.