Table 3 Impact of tillage practices and weed management options on concentration of various pools of carbon (g kg-₁) and total organic carbon (TOC) (g kg-₁) depth-wise after five years (after harvest of maize in winter) in the 10th cropping cycle, 2023-24.

From: Assessment of conservation agriculture on soil nutrient’s stratification ratio, carbon sequestration rate, management indices and crop productivity in Southern Telangana India

Treatments

0–15 cm

15–30 cm

CVL

CL

CLL

CNL

TOC

CVL

CL

CLL

CNL

TOC

Tillage practices

 T1: CT(C)-CT(M)-Fallow (NSr)

2.65

1.95

1.73

1.86

8.19

1.59

1.36

1.73

2.85

7.06

 T2: CT(C)-ZT(M)-ZT(Sr)

2.83

2.22

1.93

3.02

10.00

1.80

1.70

2.09

2.91

8.03

 T3: ZT(C) + SrR-ZT(M) + CR-ZT(Sr) + MS

3.35

2.68

2.42

3.24

11.69

2.21

2.17

2.13

2.92

8.78

SE(m)±

0.10

0.14

0.22

0.21

0.32

0.05

0.22

0.09

0.24

0.16

CD(P = 0.05)

0.40

0.56

NSs

0.85

1.29

0.20

0.80

NS

NS

0.63

Weed management options

 W1- Chemical weed control

2.89

1.95

2.15

2.29

9.28

1.71

1.43

1.72

3.42

7.63

 W2-Herbicide rotation

2.67

2.20

1.59

3.20

9.66

2.27

1.44

1.66

3.00

7.85

 W3- IWM

2.96

2.21

2.04

3.00

10.21

1.85

1.58

2.23

2.76

7.92

 W4- Single hand-weeded control

3.28

2.78

2.32

2.36

10.72

1.63

2.52

2.32

2.38

8.42

SE(m)±

0.18

0.18

0.17

0.08

0.41

0.15

0.16

0.15

0.28

0.18

CD(P = 0.05)

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

Interactions (TxW) CD(P = 0.05)

NS

NS

NS

NS

NS

NS

NS

NS

NS

NS

  1. CT = conventional tillage, ZT = zero tillage; R = crop residue retention; IWM = integration of chemical weed control + power and 1 hand weeding, C = cotton, M = maize, Sr = Sesbania rostrata, CVL= very labile carbon, CL= labile carbon, CLL = less labile carbon, CNL= non-labile carbon and TOC = total organic carbon, CD (P = 0.05) = critical difference at 5% probability level, Ns = non-significant, SE(m) = standard error of the mean.
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