Figure 6

Pearson’s correlations of soil organic matter with the Chao 1 index (a, n = 12) and Shannon index (b, n = 12); the soil nitrate nitrogen with root weight (c) and root/shoot ratio (d) of rice seedlings on D10 (dotted line, n = 6) and D20 (solid line, n = 6); the soil alkali-hydrolyzed nitrogen with root weight (e) and root/shoot ratio (f) of rice seedlings on D10 (dotted line, n = 6) and D20 (solid line, n = 6); and the soil alkali-hydrolyzed nitrogen (g, n = 12) and available potassium (h, n = 12) with soluble sugar content of rice seedlings. * and ** denote significant differences at the 0.05 probability level and 0.01 probability level, respectively.