Skip to main content

Table 7 Effect of tillage and cropping sequence combination on soil Zn concentration and cation exchange capacity at the 0–120 cm depth in 2013

From: Dryland soil chemical properties and crop yields affected by long-term tillage and cropping sequence

Tillage and cropping sequencea

Soil depth

0–7.5 cm

7.5–15 cm

15–30 cm

30–0 cm

60–90 cm

90–120 cm

Zn concentration (mg Zn kg−1)

 NTCW

2.33abAc

0.42B

0.14B

0.16B

0.14B

0.21B

 STCW

1.88abA

0.40B

0.21B

0.17B

0.17B

0.36B

 FSTCW

1.71abA

0.52B

0.19B

0.21B

0.23B

0.38B

 FSTW-B/P

1.15bA

0.56B

0.25B

0.21B

0.18B

0.20B

 STW-F

0.96bA

0.35B

0.20B

0.24B

0.32B

0.30B

 Contrast

  NT vs. T

0.54

−0.04

−0.06

−0.03

−0.06

−0.16

  CW vs. W-F

0.92*

0.05

0.01

−0.07

−0.15

0.06

  CW vs. W-B/P

0.56

−0.04

−0.06

−0.00

0.05

0.18*

CEC (cmolc kg−1)

 NTCW

14.3aC

11.6C

22.2B

32.8A

33.9A

33.1A

 STCW

14.5aC

12.9C

19.3B

29.0A

34.0A

33.5A

 FSTCW

14.6aC

13.3C

25.1B

34.0A

34.2A

33.8A

 FSTW-B/P

13.4aC

14.2C

23.5B

30.0A

32.0A

33.9A

 STW-F

11.9bC

15.9BC

24.3AB

29.7A

33.2A

33.3A

 Contrast

  NT vs. T

−0.3

−1.5

0.0

1.3

−0.2

−0.6

  CW vs. W-F

2.6**

−3.0

−5.0

−0.7

0.8

0.2

  CW vs. W–B/P

1.2

−0.9

1.6

4.0

2.2

−0.1

  1. NTCW no-till continuous spring wheat, STCW spring till continuous spring wheat and STW-F spring till spring wheat-fallow. CW represents continuous wheat, NT no-till, T till, W–B/P spring wheat–barley/pea and W-F spring wheat-fallow.
  2. * and ** Significant at P = 0.05 and 0.01, respectively.
  3. aTillage and cropping sequence are FSTCW fall and spring till continuous spring wheat, FSTW–B/P fall and spring till spring wheat–barley (1994–1999) followed by spring wheat–pea (2000–2013).
  4. bNumbers followed by different lowercase letters within a column among treatments in a set are significantly different at P ≤ 0.05 by the least square means test.
  5. cNumbers followed by different uppercase letters within a row among soil depths in a set are significantly different at P ≤ 0.05 by the least square means test.