Table 3 The chemical properties of pig manure at different sampling stage.

From: Preliminary design for establishing compost maturity by using the spectral characteristics of five organic fertilizers

Sampling time

pH

OM3 (%)

HA4 (%)

C/N

C (%)

N (%)

P (%)

K (%)

Ca (%)

Mg (%)

Mn (mg/kg)

Fe (mg/kg)

Cu (mg/kg)

Zn (mg/kg)

Na (mg/kg)

W02

7.2 ± 0.2a1

88.8 ± 5.8a

0.7 ± 0.4c

26.3 ± 0.4

61.2 ± 1.6a

2.33 ± 0.12a

0.32 ± 0.07b

0.16 ± 0.03b

10,842 ± 1035b

1604 ± 166c

113 ± 61b

217 ± 96d

152 ± 49c

434 ± 123c

596 ± 93b

W2

7.1 ± 0.3a

85.9 ± 3.2a

1.4 ± 0.4b

26.0 ± 0.3a

58.1 ± 1.2a

2.23 ± 0.11a

0.47 ± 0.18ab

0.32 ± 0.04a

16,817 ± 988b

2751 ± 889bc

202 ± 32b

423 ± 175c

261 ± 56b

743 ± 139ab

1111 ± 166a

W4

6.8 ± 0.3a

78.1 ± 4.9a

1.6 ± 0.3a

24.1 ± 0.2a

54.9 ± 1.1a

2.28 ± 0.13a

0.68 ± 0.18a

0.35 ± 0.03a

25,773 ± 1125ab

3374 ± 955b

261 ± 18b

428 ± 236c

282 ± 58b

998 ± 83b

1427 ± 123a

W6

7.0 ± 0.1a

72.6 ± 5.8b

2.1 ± 0.3a

21.9 ± 0.2ab

51.9 ± 1.5ab

2.37 ± 0.12a

0.86 ± 0.16a

0.39 ± 0.04a

25,560 ± 1023ab

4914 ± 744b

308 ± 39a

1412 ± 1124b

278 ± 80b

1048 ± 90b

1203 ± 163a

W8

7.0 ± 0.2a

61.1 ± 5.4b

2.5 ± 0.5a

19.8 ± 0.4b

48.6 ± 2.4b

2.45 ± 0.14a

0.79 ± 0.15

0.32 ± 0.04a

38,424 ± 1321a

7361 ± 856a

406 ± 63a

4167 ± 1056a

568 ± 78a

2067 ± 89a

1057 ± 134a

  1. 1Different letters indicate significantly different results by LSD tests at p < 0.05.
  2. 20, 2, 4, 6, 8 week after compost.
  3. 3Organic matter.
  4. 4Humic acid.