Table 2 Chemical soil analysis at depths of 0–0.2 m and 0.2–0.4 m from the experimental field sites in Guarapuava, Parana State, Brazil measured before the 2016/2017 and 2017/2018 growing seasons.

From: Changes in soybean cultivars released over the past 50 years in southern Brazil

Season

Depth

pH

Organic matter

P

K+

Ca2+

Mg2+

H + Al

Al3+

CEC†

SO4-S

m

CaCl2

g dm−3

mg dm−3

-mmolc dm−3

mg dm−3

2016/2017

0–0.2

5.3

37

35

1.2

36

12

34

0

82

11

0.2–0.4

4.5

32

5

1.2

21

10

80

1

112

56

2017/2018

0–0.2

4.7

39

39

3.5

33

13

64

2

114

12

0.2–0.4

4.8

27

4

1.2

19

13

58

0

91

29

  1. CEC Cation exchange capacity; Organic matter was determined by the Walkley–Black method; P, K+, Ca2+, and Mg2+ were extracted by ion exchange resin; Al3+ was extracted by KCl 1 mol L−1; H + Al was extracted by SMP method.
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