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The environmental impact of nopal (Opuntia ficus-indica) production in Mexico City, Mexico through a life cycle assessment (LCA)

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Abstract

Nopal (Opuntia ficus-indica) is widely cultivated in Mexico as a food raw material. However, the environmental impact caused by the growth and harvesting life cycle of this feedstock has been poorly studied. In this study, the environmental consequences of the growing, harvesting and transportation processes of nopal were evaluated with the aid of a life cycle assessment (LCA) method using SimaPro software version 8.5.2. The results showed that global warming (83.13%) and ozone depletion (99.25%) were significantly affected by the cultivation process due to current fertilization methods. The number of estimated gasses and chemicals emitted like ammonium (18.88 kgNH3/ha/year), nitrogen oxides (35.32 kgNOX–NO2/ha/year) and nitrous oxide (28.57 kgN2O/ha/year) were believed to be the result of the chemical fertilizers employed. The current cultivation process additionally reported emissions of nitrate (886.48 kgNO3/ha/year) and phosphorus (0.041 kg P/ha/year) caused by soil water erosion. The transportation process reported low levels of environmental impact; however, a significant amount of acidification (88.54%), mineral depletion (80.95%) and water consumption (84.06%) resulted from the process utilized to produce nopal in brine. In summary, the entire process resulted in a Global Warming Potential (GWP) of 0.562 kg/CO2 eq.

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Funding

This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Authors and Affiliations

Authors

Contributions

Guillermo Alexis Vergel-Rangel was involved in methodology, investigation and validation. Pablo Emilio Escamilla-García was involved in conceptualization, writing—original draft and project administration. Raúl Horacio Camarillo-López was involved in writing—review and editing and formal analysis. Jair Azael Esquivel-Guzmán was involved in resources, writing—review and editing. Francisco Pérez-Soto was involved in investigation.

Corresponding author

Correspondence to Pablo Emilio Escamilla-García.

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Appendix A: Main characteristics of Regosol soil in Milpa Alta, Mexico City

Appendix A: Main characteristics of Regosol soil in Milpa Alta, Mexico City

General data of the soil in Milpa Alta

General soil

Dominant soil

Associated soils and inclusions

Sequence

1

2

3

4

Share in Soil Mapping Unit (%)

55

30

10

5

Database ID

19,616

19,617

19,618

19,619

Soil unit symbol (FAO 74)

Soil unit name (FAO74)

Soil unit symbol (FAO 85)

Soil unit name (FAO 85)

Soil unit symbol (FAO 90)

RGe

PHh

RGe

ANu

Soil unit name (FAO 90)

Eutric Regosols

Haplic Phaeozems

Eutric Regosols

Umbric Andosols

Soil texture

Coarse

Fine

Coarse

Medium

Ref. floor depth (cm)

100

100

100

100

AWC (mm)

100

150

100

150

General data of surface soil (0–30 cm) in Milpa Alta

Surface soil (0–30 cm)

Dominant soil

Associated soils and inclusions

Sand fraction in soil (%)

73

25

73

50

Silt fraction in soil (%)

23

35

23

42

Clay fraction in soil (%)

4

40

4

8

USDA classification of soil texture

Sandy loam

Clay (light)

Sandy loam

Loam

Apparent density of the reference soil (kg/dm3)

1,7

1,27

1,7

1,56

Soil apparent density (kg/dm3)

1,52

1,18

1,52

1,41

Gravel content in soil (%)

19

4

19

10

Soil organic carbon (% weight)

0,41

2,74

0,41

4,19

Soil pH (H2O)

6

6,4

6

6,4

Topsoil CEC (clay) (cmol/kg)

140

21

140

140

Topsoil CEC (soil) (cmol/kg)

14

18

14

38

Soil base saturation (%)

80

90

80

80

Topsoil TEB (cmol/kg)

11,2

16,2

11,2

30,4

Soil calcium carbonate (% weight)

0

0,2

0

0

Soil gypsum (% weight)

0

0,1

0

0

Soil sodium (ESP) (%)

2

1

2

1

Soil salinity (ECe) (dS/m)

0

0,1

0

0

General data of surface soil (30–100 cm) in Milpa Alta

Surface soil (30–100 cm)

Dominant soil

Associated soils and inclusions

Sand fraction in soil (%)

73

21

73

51

Silt fraction in soil (%)

23

29

23

46

Clay fraction in soil (%)

4

50

4

3

USDA classification of soil texture

Sandy loam

Clay (light)

Sandy loam

Sandy loam

Apparent density of the reference soil (kg/dm3)

1,7

1,23

1,7

1,7

Soil apparent density (kg/dm3)

1,53

1,12

1,53

1,47

Gravel content in soil (%)

19

4

19

10

Soil organic carbon (% weight)

0,15

1,42

0,15

2,3

Soil pH (H2O)

6,4

6,2

6,4

6,3

Subsoil CEC (clay) (cmol/kg)

140

20

140

140

Subsoil CEC (soil) (cmol/kg)

13

15

13

30

Soil base saturation (%)

85

94

85

80

Subsoil TEB (cmol/kg)

11,1

14,1

11,1

24

Soil calcium carbonate (% weight)

0,2

0,1

0,2

0,1

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Vergel-Rangel, G.A., Escamilla-García, P.E., Camarillo-López, R.H. et al. The environmental impact of nopal (Opuntia ficus-indica) production in Mexico City, Mexico through a life cycle assessment (LCA). Environ Dev Sustain 23, 18068–18095 (2021). https://doi.org/10.1007/s10668-021-01428-7

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  • DOI: https://doi.org/10.1007/s10668-021-01428-7

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