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

From: Organic amendments alleviate early defoliation and increase fruit yield by altering assembly patterns and of microbial communities and enzymatic activities in sandy pear (Pyrus pyrifolia)

  Treatments
CK CK-HA BIO BIO-HA
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
 NO3N 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
  1. CK conventional fertilization, HA humic acid amendment, CK-HA conventional fertilization combined with HA, BIO bio-organic fertilizer, BIO-HA mixed application of BIO and HA, SOC soil organic carbon, TN total nitrogen, NH4+-N ammonium nitrogen, NO3-N nitrate-nitrogen, AP available phosphorus, AK available potassium, C/N ration of soil carbon content to nitrogen content
  2. Each value represents the mean (n = 6), and standard error values are indicated with ± 
  3. Different letters indicate significant difference (P < 0.05) in every column among the four treatments as determined by Fisher’s least significant difference test (LSD) at α = 0.05