Effect of long-term organic fertilizer replacing chemical fertilizer on rhizosphere soil fertility and fruit quality in citrus (Citrus sinensis Osbeck cv. Newhall)

The experiment was set up as five fertilization treatments with different N dose ratios, including 100% chemical fertilizer N (T1), 70% chemical fertilizer N + 30% organic fertilizer N (T2), 50% chemical fertilizer N + 50% organic fertilizer N (T3), 30% chemical fertilizer N + 70% organic fertilizer N (T4), and 100% organic fertilizer N (T5), and the non-fertilizer treatment was used as the control (CK).