## 3 Results
### Overall Effect of Organic Fertilizer on Tomato Yield and Quality
The numbers on the right side of the confidence intervals represent the sample sizes. AOF, animal organic fertilizer; MOF, mixed animal-and-plant organic fertilizer; POP, plant organic fertilizer; OOF, other organic fertilizer. Effect of Organic Fertilizer Combined with Soil Organic Matter, Total Soil Nitrogen, and Organic-Fertilizer Type on Lycopene  
The soil organic matter had no significant effect on tomato lycopene under organic fertilizers (Figure 8a). When the total soil nitrogen was >1 g\(\cdot\)kg\({}^{-1}\), the lycopene increased by 29.67%, while when it was <0.1 g\(\cdot\)kg\({}^{-1}\), there was no statistically significant difference (Figure 8b). The plant organic fertilizer significantly improved tomato lycopene, with a percentage change of 35.38% (Figure 8c). Animal organic fertilizer and other types had no significant effect on tomato lycopene improvement, with percentage changes of 25.60% and 10.56%, respectively. The soil pH had a significant effect on lycopene under organic fertilizers (Figure 8d). When the pH was < 7, the percentage change of adding organic fertilizers to lycopene was 18.42%; at a pH \(\geq\) 7, the percentage change was 28.30%. The improvement effect on lycopene in tomatoes cultivated in the open field was significantly higher (27.58%) than that in facility cultivation (14.09%) under organic fertilizers' application (Figure 8e). Figure 6: Organic fertilizers combined with soil organic matter (**a**), total soil nitrogen (**b**), type of organic fertilizers (**c**), soil pH (**d**), and cultivation type (**e**) on tomato SS (soluble sugar) percentage changes. Points represent the mean effect, while bars represent 95% confidence intervals. The numbers on the right side of the confidence intervals represent the sample sizes. AOF, animal organic fertilizer; MOF, mixed animal-and-plant organic fertilizer; POF, plant organic fertilizer; OOF, other organic fertilizer. Effect of Organic Fertilizer Combined with Soil Organic Matter, Total Soil Nitrogen, and Organic-Fertilizer Type on VC  
The organic fertilizers increased tomato VC content when the soil organic matter was < 20 g\(\cdot\)kg\({}^{-1}\), which increased by 10.09%. The soil organic matter was \(\geq\)20 g\(\cdot\)kg\({}^{-1}\) and had a significant positive effect on tomato VC content, which increased by 32.02% (Figure 9a). Total soil nitrogen content had no effect on tomato VC rise when organic fertilizers was applied versus no fertilizer application (Figure 9b). Among the organic-fertilized types, animal organic fertilizer, plant organic fertilizer, and mixed animal-and-plant organic fertilizer all had significant effects on the improvement of tomato VC content, with percentage changes of 16.66%, 20.84%, and 24.45%, respectively; mixed animal and plant organic fertilizer had the most significant effect (Figure 9c). At a soil pH < 7, the increase of organic fertilizers had a significant effect on the increase of tomato VC, increasing by 31.26%, while at a soil pH \(\geq\) 7, the percentage change was 18.84% (Figure 9d). Other organic fertilizers had no significant effect on tomato VC content. The effect of organic fertilizers applied in the open field was significantly higher than that in the greenhouse, with a percentage change of 27.01% and 15.28%, respectively (Figure 9e). Figure 7: Organic fertilizers combined with soil organic matter (**a**), total soil nitrogen (**b**), type of organic fertilizers (**c**), soil pH (**d**), and cultivation type (**e**) on tomato SAR (sugar/acid content ratio) percentage changes. Points represent the mean effect, while bars represent 95% confidence intervals. The numbers on the right side of the confidence intervals represent the sample sizes. AOF, animal organic fertilizer; MOF, mixed animal-and-plant organic fertilizer; POP, plant organic fertilizer; OOF, other organic fertilizer.