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Chemical and Biological Technologies in Agriculture

Table 1 Typical chemical properties and texture of surface layer (0–0.2 m) of Argissolo Amarelo soil [Ultisols] in an agrarian settlement in the north of Rio de Janeiro State

From: Challenge of transition: the history of a case study involving tropical fruits polyculture stimulated by humic acids and plant-growth promoting bacteria

Site

pH H2O

H + Al

Al3+

P

K+

Ca2+

Mg2+

Na+

C

N

CEC

Sand

Silt

Clay

 

cmolc kg−1

mg kg−1

cmolC kg−1

(%)

(%)

cmolc kg−1

%

#1

5.4

7.7

0.3

8

0.10

2.4

1.9

0.10

2.4

0.2

12.2

54.0

10.0

36.0

#2

4.5

12.1

2.5

3

0.12

0.5

0.5

0.09

2.6

0.2

13.3

50.0

11.0

39.0

#3

5.0

9.7

0.9

2

0.15

2.3

0.8

0.04

2.2

0.2

13.0

56.0

7.0

37.0

#4

5.1

8.3

1.8

2

0.15

1.0

0.5

0.02

1.8

0.2

11.5

49.0

8.0

38.0

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