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Chemical and Biological Technologies in Agriculture

Table 1 Some chemical characteristics of soil samples are collected in two places (São Carlos and Brotas, São Paulo, Brazil) at the crow projection (considered treated = HS) and between the lines defined as control

From: Humic substances trigger plant immune responses

 

São Carlos-12y

Brotas-6y

 

Control

HS

control

HS

 

0–20 cm

20–40 cm

0–20 cm

20–40 cm

0–20 cm

20–40 cm

0–20 cm

20–40 cm

pH (H2O)

6.90

6.10

6.6

6.7

6.4

6.5

4.8

5.1

OM (g dm−3)

8.0

9.4

18.8

9.4

10.5

9.4

12.7

6.7

P (mg dm−3)

7.9

2.3

48.3

11.4

6.7

4.4

39.8

10.6

K (Cmolc dm−3)

0.18

0.08

0.23

0.09

0.05

0.04

0.46

0.39

Ca (Cmolc dm−3)

2.3

0.4

2.4

1.3

1.1

1.4

0.70

0.60

Mg (Cmolc dm−3)

0.7

0.5

0.5

0.5

0.5

0.5

0.5

0.4

H + Al (Cmolc dm−3)

1.5

1.7

1.62

1.5

1.6

1.6

1.9

2.3

Fe (mg dm−3)

49.3

91.4

41.5

72.1

14.8

48.7

34.2

34.0

Cu (mg dm−3)

6.2

nd

19.5

5.5

12.1

5.8

19.2

18.2

Zn (mg dm−3)

11.0

0.9

36.0

8.5

1.75

0.46

4.7

5.0

Mn (mg dm−3)

44.6

24.9

53.6

31.1

55.3

46.5

39.8

39.3

  1. The values correspond to the average of three compost samples (n = 3). Each sample was composed of 10 subsamples. The values in bold correspond to significant differences at the same soil layer by LSD test p < 0.05
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