Table 2 Large macroaggregates (LMa), small macroaggregates (SMa) and microaggregates (Mi) in topsoil and subsoil under different treatments after 3 years of rice-wheat cropping rotation.

From: Effects of tillage and straw return on water-stable aggregates, carbon stabilization and crop yield in an estuarine alluvial soil

Treatments

LMa > 2 mm (%)

SMa 2-0.25 mm (%)

Mi 0.25–0.053 mm (%)

0–20 cm

20–40 cm

0–20 cm

20–40 cm

0–20 cm

20–40 cm

T1

7.59 ± 4.28 cd

1.13 ± 0.08 f

50.67 ± 1.36e

33.25 ± 0.84d

18.62 ± 2.12 cd

11.12 ± 0.24d

T2

7.05 ± 2.77d

7.62 ± 0.34ab

48.52 ± 0.85d

36.41 ± 0.29c

16.53 ± 0.04e

14.63 ± 0.48c

T3

5.31 ± 0.45e

3.46 ± 0.64d

56.46 ± 1.10c

37.42 ± 0.85c

18.04 ± 0.54d

15.49 ± 1.18bc

T4

9.81 ± 1.83ab

2.52 ± 1.18e

45.48 ± 0.19de

45.53 ± 1.67bc

22.65 ± 0.19a

12.64 ± 1.82d

T5

8.46 ± 0.74c

6.51 ± 1.39b

62.07 ± 0.46b

49.42 ± 2.57b

18.43 ± 0.46 cd

17.48 ± 1.29b

T6

7.56 ± 2.41 cd

4.68 ± 0.66c

59.87 ± 1.18bc

38.64 ± 2.60c

19.78 ± 1.83c

16.22 ± 1.20b

T7

9.61 ± 1.81b

6.38 ± 1.48b

62.11 ± 1.67b

46.20 ± 0.54bc

20.68 ± 1.42b

14.63 ± 0.40c

T8

10.26 ± 3.69a

8.21 ± 1.74a

67.65 ± 3.20a

56.48 ± 1.18a

19.64 ± 1.19c

19.74 ± 0.66a

T9

9.72 ± 2.77ab

8.16 ± 0.82a

66.87 ± 0.62a

55.77 ± 1.86a

20.53 ± 0.23b

20.35 ± 1.81a

Mean

8.36

5.07

58.07

44.32

19.42

15.81

  1. Mean values are shown ± SEs (n = 3), and different lowercase letters in the same column indicate significant differences at P < 0.05. Treatment abbreviations are as listed in Table 1.
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