## 3 Results  
No significant differences were recorded between the two research years referring to the variables examined, and therefore, only their average values are reported. In Table 1, the main effects of the experimental factors applied on the variables examined are presented, whereas no significant interactions arose. The highest fruit yield was achieved in the loamy soil (8.84 kg m\({}^{-2}\)), compared to clayey and sandy soils (7.95 and 7.73 kg m\({}^{-2}\)), respectively. The loamy soil also showed higher numbers of rotten waste fruits and green waste fruits than the clayey soil, but not significantly different from the sandy soil. In the loamy soil, the number of fruits per area was about 5% higher than that of both the clayey and sandy soils. The average fruit weight provided by the loamy soil was 8.2% higher than that under sandy soil, with no significant differences compared to the clayey soil. In our study, higher plant fresh and dry weights were recorded in the loamy soil, but this was not significant compared to the clay soil in terms of fresh weight. In our study, the effect of the fertilizers applied led to significant differences in the tomato fruit yield: the highest production was achieved under the application of the mineral fertilizer, followed by the compost-mineral mixture and the compost, respectively. The mineral fertilizer resulted in a 1.12-fold higher yield than the compost-mineral fertilizer and a 1.60-fold higher yield than the application of compost alone. The application of compost alone showed significantly lower values of rotten waste fruits, while there was no significant difference in the yield of green waste fruits. Despite the yield losses due to the rotten waste fruits, the marketable yield showed the same trend as the total yield, with the highest values corresponding to mineral fertilizer, followed by compost-mineral and compost. In our study, we observed that the plants grown in loamy soil showed the highest average fresh weight, although it was not significantly different from that of the clayey soil, and dry weight. The number of fruits per square meter was higher with the mineral fertilizer, by 35% and 16% compared to the compost and compost-mineral, respectively. The average fruit weight reached the lowest values with the compost application, while there were no significant differences between the other two fertilizer types. Mineral fertilization positively influenced plant fresh weight the most, followed by the compost-mineral mixture, whereas compost had the same effect on plant dry weight. In Table 2, the main effects of the experimental treatments on the variables measured are shown, whereas no significant interactions arose. The loamy soil led to the highest tittatable acidity and dry residue (\"Brix) in tomato fruits, as well as a more intense red color. No significant differences were recorded between the clayey and sandy soils for all the variables examined. The soluble solids content was higher in the loamy soil than in the sandy one. Color followed the same trend as the variables described above. The application of compost fertilizer resulted in a higher dry residue level (\"Brix) by 4% and 10% compared to the compost-mineral and mineral fertilizers, respectively. The fruit color reached higher levels with the compost and the compost-mineral mix, with no statistically significant differences between them. In this study, a significant interaction arose between the applied experimental treatments regarding fruit dry matter (Figure 1). The highest fruit accumulation of dry matter was recorded under the loamy soil x compost interaction, whereas the lowest was recorded upon sandy soil x mineral fertilizer (\(-27\%\) compared to the loamy soil x compost interaction). In clayey soil, the amount of dry matter in the fruit remained unchanged, with no significant interaction with the fertilizer type. Figure 1 shows the dry matter drop with the decrease of compost supply both in loamy and sandy soils.