Table 1 Organic carbon contents in soil aggregates of all size fractions (g·kg−1 soil).

From: Impacts of Long-term Fertilization on the Molecular Structure of Humic Acid and Organic Carbon Content in Soil Aggregates in Black Soil

Treatment

Aggregate size fraction

>2 mm

2 mm–0.25 mm

0.25 mm–0.053 mm

<0.053 mm

CK

11.49 ± 0.04 cB

11.61 ± 0.03 cB

13.46 ± 0.04 cA

9.61 ± 0.04 cC

NPK

13.56 ± 0.07 bB

13.49 ± 0.03 bB

15.55 ± 0.05 bA

10.65 ± 0.13 bC

M

14.82 ± 0.08 aB

13.29 ± 0.04 bBC

16.46 ± 0.05 abA

11.32 ± 0.11 aC

MNPK

14.35 ± 0.07 abB

13.76 ± 0.08 aB

16.88 ± 0.05 aA

10.55 ± 0.11 bC

  1. CK, no fertilizer treatment; NPK, chemical NPK fertilizers; M, organic manure treatment; MNPK, treatment of organic manure combined with chemical NPK fertilizers. Different lowercase letters in the same column indicate significant difference among different treatments at P < 0.05. Different uppercase letters in the same row indicate significant difference among different aggregate sizes at P < 0.05.
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