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. 2018 Apr 16;6:e4623. doi: 10.7717/peerj.4623

Table 1. Effects of fertilizations on the soil chemical properties.

De Tr OC g kg−1 TN g kg−1 C/N AN mg kg−1 AP mg kg−1 pH
June 2016
0–10 cm CK 10.09 ± 0.23a 0.87 ± 0.02a 11.57 ± 0.05a 98.70 ± 1.21a 3.58 ± 1.31c 7.83 ± 0.11a
P 9.69 ± 0.23a 0.98 ± 0.03a 9.92 ± 0.36b 100.80 ± 5.28a 14.43 ± 0.51a 7.75 ± 0.09a
N 10.85 ± 0.68a 1.07 ± 0.02a 10.13 ± 0.57b 103.60 ± 2.80a 6.33 ± 2.35bc 7.58 ± 0.16a
NP 9.96 ± 0.13a 1.16 ± 0.01a 8.59 ± 0.13c 107.10 ± 3.21a 13.91 ± 0.55a 7.75 ± 0.09a
M 10.80 ± 0.29a 1.12 ± 0.02a 9.67 ± 0.17b 101.50 ± 12.38a 10.48 ± 3.27ab 7.82 ± 0.06a
10–20 cm CK 8.34 ± 0.59a 0.88 ± 0.06a 9.56 ± 0.56ab 79.80 ± 4.85a 1.83 ± 0.80b 7.99 ± 0.09a
P 7.77 ± 0.29a 0.91 ± 0.05a 8.53 ± 0.17bc 83.13 ± 3.20a 6.25 ± 1.09a 7.71 ± 0.12a
N 8.38 ± 0.09a 0.94 ± 0.03a 8.97 ± 0.36bc 72.80 ± 1.40a 4.17 ± 0.36ab 7.82 ± 0.09a
NP 7.67 ± 0.01a 0.92 ± 0.01a 8.33 ± 0.11c 86.63 ± 6.26a 2.83 ± 0.36ab 8.02 ± 0.12a
M 9.52 ± 0.12a 0.91 ± 0.02a 10.45 ± 0.38a 72.80 ± 1.40a 3.67 ± 2.10ab 8.04 ± 0.08a
July 2016
0–10 cm CK 10.51 ± 0.40a 1.05 ± 0.02a 10.00 ± 0.47c 88.90 ± 9.42a 2.92 ± 0.10c 7.85 ± 0.19a
P 12.13 ± 0.47a 0.88 ± 0.001a 13.84 ± 0.55a 97.30 ± 3.90a 19.44 ± 1.83a 7.75 ± 0.14a
N 12.44 ± 0.18a 1.03 ± 0.05a 12.15 ± 0.64b 98.70 ± 9.15a 3.79 ± 0.83c 7.37 ± 0.15a
NP 12.13 ± 0.83a 1.18 ± 0.04a 10.28 ± 0.61c 109.90 ± 5.47a 11.25 ± 2.66b 7.59 ± 0.16a
M 10.83 ± 0.18a 1.19 ± 0.05a 9.12 ± 0.21c 93.10 ± 8.94a 4.23 ± 1.51c 7.63 ± 0.15a
10–20 cm CK 9.46 ± 0.24a 0.88 ± 0.02a 10.71 ± 0.12a 72.10 ± 2.80a 2.52 ± 0.12b 8.05 ± 0.12a
P 9.60 ± 0.14a 0.85 ± 0.03a 11.32 ± 0.47a 74.90 ± 9.10a 4.16 ± 0.38a 8.19 ± 0.16a
N 9.77 ± 0.65a 0.91 ± 0.01a 10.74 ± 0.78a 77.70 ± 9.92a 2.15 ± 0.34b 7.86 ± 0.03a
NP 8.53 ± 0.42a 1.00 ± 0.03a 8.55 ± 0.29b 89.60 ± 6.22a 2.75 ± 0.66b 8.04 ± 0.09a
M 10.38 ± 0.65a 0.99 ± 0.06a 10.51 ± 0.31a 90.3 ± 10.57a 1.98 ± 0.19b 8.00 ± 0.07a
August 2016
0–10 cm CK 9.25 ± 0.05a 1.26 ± 0.03a 7.37 ± 0.18a 92.17 ± 6.27a 3.38 ± 0.57c 7.78 ± 0.12a
P 11.32 ± 0.08a 1.23 ± 0.01a 9.23 ± 0.14a 94.73 ± 3.06a 15.17 ± 3.47a 7.64 ± 0.10a
N 10.29 ± 0.87a 1.42 ± 0.12a 7.28 ± 0.41a 106.6 ± 15.16a 3.22 ± 0.50c 7.45 ± 0.12b
NP 9.00 ± 0.44a 1.36 ± 0.01a 6.61 ± 0.35a 107.10 ± 8.17a 11.85 ± 2.49ab 7.44 ± 0.06b
M 10.15 ± 0.00a 1.23 ± 0.04a 8.29 ± 0.24a 92.26 ± 2.03a 8.17 ± 2.23bc 7.49 ± 0.03a
10–20 cm CK 9.50 ± 0.16a 1.09 ± 0.003a 8.75 ± 0.12b 80.73 ± 3.93a 2.31 ± 0.30c 8.07 ± 0.15a
P 10.66 ± 0.21a 1.02 ± 0.01a 10.43 ± 0.15b 77.93 ± 2.63a 5.32 ± 1.64ab 8.00 ± 0.08a
N 8.78 ± 0.32a 1.15 ± 0.07a 6.88 ± 0.21b 74.20 ± 10.01a 2.28 ± 0.27c 8.04 ± 0.28a
NP 7.91 ± 0.13a 1.12 ± 0.03a 7.06 ± 0.27b 72.80 ± 1.85a 7.35 ± 1.02a 7.92 ± 0.03a
M 9.78 ± 0.02a 1.00 ± 0.05a 9.82 ± 0.50a 78.26 ± 7.40a 3.62 ± 0.18bc 7.76 ± 0.01a

Notes.

Different lowercase letters after the data within each soil layer represented significance at P < 0.05 (l.s.d).

De, depth; Tr, treatment; CK, Control; P, 60 kg P ha−1; N, 100 kg N ha−1; NP, 60 kg P ha−1 plus 100 kg N ha−1; M, 4,000 kg sheep manure ha−1. OC, organic C; TN, total N; AN, alkali dispelled N; AP, available P. Values were the means of three replicates ±  SE.