Table 1 Effect of organic amendments on the physicochemical characteristics of the pear orchard acid red soil

Soil properties in 2018 yr

 pH

4.6 (0.21) b

4.8 (0.13) b

5.3 (0.08) a

5.4 (0.13) a

 SOM g kg⁻¹

19.4 (0.72) b

20.1 (0.37) ab

22.7 (1.47) a

22.1 (1.92) a

 TN g kg⁻¹

0.9 (0.06) b

1.2 (0.11) ab

1.3 (0.20) ab

1.5 (0.11) a

 NH₄⁺-N mg kg⁻¹

17.5 (3.00) b

28.1 (2.53) a

27.7 (1.51) a

35.9 (4.59) a

 NO₃⁻-N mg kg⁻¹

35.6 (2.92) b

36.6 (2.12) b

28.8 (1.38) b

48.6 (5.29) a

 AP mg kg⁻¹

91.4 (8.27) b

115.2 (11.40) b

158.7 (7.7) a

181.2 (19.03) a

 AK mg kg⁻¹

123.7 (17.87) b

148.3 (21.1) b

222.9 (22.82) a

281.7 (22.65) a

 C/N

12.2 (0.92) a

10.3 (1.15) a

10.4 (1.99) a

8.7 (0.83) a

Soil properties in 2019 yr

 pH

4.7 (0.16) a

4.9 (0.07) a

5.4 (0.10) b

5.5 (0.12) b

 SOM g kg⁻¹

20.9 (1.56) b

21.3 (0.91)a

23.7 (1.59) a

24.5 (2.37) a

 TN g kg⁻¹

1.0 (0.08) b

1.3 (0.24) ab

1.3 (0.19) ab

1.6 (0.10) a

 NH₄⁺-N mg kg⁻¹

21.0 (2.30) b

32.0 (2.27) b

44.2 (3.97) a

56.6 (4.79) a

 NO₃^—N mg kg⁻¹

27.9 (1.69) d

46.9 (4.27) c

68.1 (4.31) b

87.0 (5.72) a

 AP mg kg⁻¹

84.9 (6.08) b

104.9 (5.58) b

166.2 (26.85) a

187.2 (22.97) a

 AK mg kg⁻¹

152.9 (25.47) b

198.4 (18.61) b

265.9 (32.42) ab

348.0 (55.90) a

 C/N

12.3 (1.20) a

10.6 (1.94) a

10.7 (1.05) a

8.9 (0.32) a