A The effects of different fertilization treatments on the relative abundance of protistan and bacterial OTUs in the rhizosphere. B Correlations between key indicator protistan and bacterial OTUs of different fertilization treatments in the rhizosphere multi-bipartite model of the food web. C, D Correlations between the relative change of the relative abundance of protistan functional groups and the relative change of Fusarium oxysporum density (C), Bacillus density and the ratio of Bacillus density to total bacteria density (D) in the rhizosphere. In panels A, B, the relative abundances of protistan and bacterial OTUs were significantly higher in the organic and chemical fertilizer treatments based on linear discriminant analysis (higher relative abundance in the organic fertilizer treatment: LDA score > 3.0 and p < 0.05; higher relative abundance in the chemical fertilizer treatment: LDA score < −3.0 and p < 0.05). OF Organic fertilizer treatment; CF Chemical fertilizer treatment. Circles are proportional to the average relative abundance of each OTU. RA Relative abundance, relative change = (OF-CF)/CF. In panels C, D, RC = relative change ((OF-CF)/CF); Bacillus/ bacteria = the ratio of Bacillus density to total bacteria density.