-- Select One -- | | Peer-Reviewed

An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City

Received: 31 March 2025     Accepted: 19 June 2025     Published: 26 June 2025
Views:       Downloads:
Abstract

Vegetables are foods everyone, very nutritious and necessary for the men in life, they can’t be insufficient, especially, vegetables cure the diseases, too. Here, we want to speak to the pumpkins. This is a kind agricultural produce which are planted generally in Vietnam country, the flowers, leaves, buds and fruits are used in order to eat, too. Pumpkins have the vitamins A, vitamins B and another nutrient, delicious. Fruits of pumpkin are not only eaten but also cure diseases such as: Brighten eyes, headache, tonic, help a strong memory; and grains can cure the worms. Pumpkins – vegetables, everyone provides the from the suburbs district such as: Binh Chanh, Hoc Mon, Cu Chi, Go Vap … and the provinces such as: Long An, Tien Giang, Tay Ninh… very much. In a season of epidemic Covid-19 ago, at the year 2021, the population of Ho Chi Minh City have many, many hard works because they are an insulation, the market assembles, it is that the autos do not run, the population of many provinces do not can transmit to the city, total works hold back many activities are stopped, the foods are rare, vegetables do not remain because they are destroyed, especially, there are only the kinds of Autum Squash, the gourd family, which the pumpkins they have money nutrient to eat, can to get many days, they do not destroy or they are destroyed rarely, everyone can put them many days in the house, the population likes eat the pumpkins, these are reasonable foods for the pours. In the report, we present food to plant, observe, analyze and study about heavy metals, insects, epidemics on the pumpkin in order to sure the health and give the nutrient for the persons.

Published in International Journal of Applied Agricultural Sciences (Volume 11, Issue 3)
DOI 10.11648/j.ijaas.20251103.14
Page(s) 94-100
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2025. Published by Science Publishing Group

Keywords

Vegetables, Heavy Metals, Nutrients, Pumpkins, Persons

1. Introduction
Pumpkins had a source from Middle of American, everyone planted all of year and a good Plantation from the South to North of Vietnam, pumpkins having :
1) General name: Bí đỏ, bí rợ.
2) Scientific: Cucurbita pepo L.
3) Foreign name: Pumpkin, Autumn Squash.
4) Family: Cucurbitaceae .
Formerly to now, the pumpkins were known and used for the riches or poor persons by a lot of vitamin such as: vitamin A, in the fruits had from 85 to 91% of water; 0,8 – 2g of protein; 0,1 – 0,5g of lipid; 3,3 – 11g glucose; an energy was from 85 to 170kcalo/100g. Besides, the leaves and the flowers were eaten because everyone boiled vegetables or vegetable soup .
By Covid – 19, the last time, 2021 it was rare vegetables in the Ho Chi Minh City, stagnated or vegetables did not transfer to the city, to the downtown, here that was not appeared vegetables while the rounding area had more and more of vegetables. In the long time, except pumpkins, everyone kept them only because they did not destroy. The other authors did not take care about this issue. Thus, we must study to plant in order to save the health for men .
2. Materials and Methods
2.1. Materials
1) Seeds of pumpkins were purchased from Hoa Sen Company.
2) The experiment was implemented in Dong Thanh village, Hoc Mon district, Ho Chi Minh City, of year 2022.
3) Vegetable samples were collected from vegetable growing households surrounding areas
2.2. Methods
Pumpkins were planted by using only organic fertilizers, such as: soil herbs, animal fertilizer, powder lime, ash of husk, biological fertilizer.
Plantation (Summary)
1) Current/events: everyone sow seeds since October, September of last year to January of new year.
2) Everyone makes herbs, soil, manures and plans the pumpkins .
3) Everyone waters, he manures (it must have from 50 – 60% of humidity for garden ).
4) Everyone cuts tops, he cuts branches, trims the male flowers of pumpkins .
5) Female flowers were received pollens with a completion.
6) At last: harvesting and everyone keeps the races of pumpkin. Pumpkins are nutritiuos, we must plant and eat them very much .
3. Results and Dicussion
1) Model of water
Table 1. Result analyzed of water sample.

N0

Parameters

Concentrations

Methods

Limitation values *

1

pH

5.35

Standard of VN 6442 - 2000

6.5 – 8.5

2

Color (Pt/10)

10

Standard of VN 6158 -1996

1.0

3

Degree of dirty (NT)

8

Standard of VN 6184 - 1996

2.0

4

N-NH4 (mg/l)

0.3

Standard of VN 5988 - 1995

0.3

5

N-NO2- (mg/l)

0

Standard of VN 6178- 1996

0.05

6

N-NO3- (mg/l)

0.3

Standard of VN 6180 – 1996

0.05

7

Cl- (mg/l)

88.8

Standard of VN 6194 – 1996

250

8

Ca2+ (mg/l)

24

Standard of VN 6224 – 1996

4.0 – 6.0

9

Mg 2+ (mg/l)

15.4

Standard of VN 6224 – 1996

2.0 – 3.0

10

SO42-

51.01

Standard of VN 6200 – 1996

≤ 0.5

11

PO43-

0.6

Standard of VN 6178 – 1996

≤ 0.1

12

Coliform (MPN/100ml)

2 x 103

Standard of VN 4882 – 2001

≤ 1000

13

E. Coli (MPN/100ml)

<0.02

Standard of VN 6846 – 2001

20

Note: *According to Vietnam standard/ National technical regulation on the limits of heavy metals contamination in food (Vietnamese Technical Regulation 8 -2:2011/ Medicinal Ministry)
In Table 1: pH was low; Color and Dirty: high; NO2-: no appear; NH4: was average; NO3-: high; Cl-: low; Ca2+ and Mg 2+: high; SO42- and PO43-: were high; Coliform: very high; E. Coli: low.
2) Model of soil
Table 2. Result analyzed of soil samples.

N0

Parameters

Concentrations

Methods

Limitation values *

1

pH (H2O) 1:5

4.43

Standard of VN 5979:1995

6.5 – 8.5

2

pH (KCl) 1:5

3.99

6.0

3

EC (µS/cm) 1:5

106.3

Standard of VN 6650:2000

10 - 20

4

Ca2+ (mg/100g)

1.89

AOAC 2000

4.0 – 6.0

5

Mg2+ (mg/100g)

0.37

2.0 – 3.0

6

N total (%)

0.159

Standard of VN 6445-2000

0.1 – 0.15

7

SO42- (mg/100g)

14.71

Standard of VN 6456-2000

10 – 2.0

8

P2O5 (%)

0.41

AOAC 2000

0.06 – 0.08

9

K2O (%)

0.016

AOAC 2000

0.3 – 1.5

10

Emery

Sand (%)

4

AOAC 2000

-

Clay (%)

70

Flesh (%)

26

Note: *According to Vietnam standard/ National technical regulation on the limits of heavy metals contamination in food (Vietnamese Technical Regulation 8 -2:2011/ Medicinal Ministry) .
In Table 2: pH: low; Ca2+ and Mg2+: low; N total: average; SO42-: high; P2O5: high; K2O: low. The soil was poor and sour, we planted difficultly, therefore, we had to add powder lime. ash of husk…
3) Model of round pumpkin
Table 3. Result analyzed of round pumpkins.

N0

Parameters

Concentrations

Methods

Limitation values *

Chemical fertilizer

Organic fertilizer

(1)

(2)

(3)

(4)

(5)

(6)

1

Wet degree (%)

90.17

91.27

AOAC & Standard 2000

80 - 90

2

NO 3- (mg/kg)

289.18

210.2

AOAC & Standard 2000

≤ 400

3

Protein (%)

0.96

0.98

AOAC 987.04-1997

0.5

4

Lipid (%)

0.28

0.56

AOAC 871.01-1997

0.5

5

Glucose total (%)

13.02

14.12

AOAC 974.06-1990

1.0

6

Substance of filament (%)

0.90

0.96

AOAC 973.18-1990

-

7

As (µg/kg)

4.48

-

ACIAR-AAS 001-2007

0.015

8

Cu (mg/kg)

3.50

-

ACIAR-AAS 007-2007

0.1

9

Pb (mg/kg)

6.70

-

ACIAR-AAS 015-2007

0.02

10

Zn (mg/kg)

53.51

1.98

ACIAR-AAS 019-2007

0.5

11

Cd (mg/kg)

1.41

-

ACIAR-AAS 004-2007

0.015

Note: *According to Vietnam standard/ National technical regulation on the limits of heavy metals contamination in food (Vietnamese Technical Regulation 8 -2:2011/ Medicinal Ministry) .
In Table 2: Wet degree: high; NO 3-: low; protein: high; glucose: high; heavy metals such as: As, Cu, Pb, Zn, Cd at a column (3) were higher at column (4); that means at the column (3): we bought fertilizer in the magazine; at column (4): we made with wild herbs * or +++ (see APPENDIX), algae, biological fertilizer…
4) Model of long pumpkins
Table 4. Result analyzed of long pumpkins.

N0

Parameters

Concentrations

Methods

Limitation values *

Chemical fertilizer

Organic fertilizer

(1)

(2)

(3)

(4)

(5)

(6)

1

Wet degree (%)

92.14

92.18

AOAC & Standard 2000

80 – 90

2

NO3- (mg/kg)

238.35

188.70

AOAC & Standard 2000

≤ 400

3

Protein (%)

0.45

0.51

AOAC 987.04-1997

0.5

4

Lipid (%)

0.23

0.29

AOAC 871.01-1997

0,5

5

Glucose total (%)

12.49

13.12

AOAC 974.06-1990

1.0

6

Substance of dirty (%)

0.86

0.98

AOAC 973.18-1990

-

7

As (µg/kg)

0.21

0.01

ACIAR-AAS 001-2007

0.015

8

Cu (mg/kg)

0.58

0.02

ACIAR-AAS 007-2007

0.1

9

Pb (mg/kg)

0.97

0.01

ACIAR-AAS 015-2007

0.02

10

Zn (mg/kg)

78.65

0.05

ACIAR-AAS 019-2007

0.5

11

Cd (mg/kg)

0.56

-

ACIAR-AAS 004-2007

0.015

Note: *According to Vietnam standard/ National technical regulation on the limits of heavy metals contamination in food (Vietnamese Technical Regulation 8 -2:2011/ Medicinal Ministry) .
In Table 4: It is similar in Table 3, that means at the column (3), fertilizer was bought in the magazine having chemicals, therefore, heavy metals were higher than column (4): not chemicals, we had a choice of wild herbs biological herbs…
4. Conclusion
At the water, soil samples that we analyzed were poor, sour; in the plantation if we buy the chemical fertilizers, it is certain that heavy metals will higher; here we had the organic fertilizer; a choice of wild herbs, we had a good result, heavy metals were little or no appear .
Abbreviations

pH

Potential of Hydrogen

N

Nitrogen

P2O5

Phosphor pentoxide

K2O

Kali oxide

Cl

Clor

Fe

Ferrum, Iron

Al

Aluminum.

Ca

Calcium

Mg

Magnesium

SO42 -

Sulfate

PO43-

Phosphate

N

Nitrogen

NO2

Nitrite

NO3

Nitrate

NH4

Ammonium

Cu

Copper

Pb

Lead

Cd

Cadmium

As

Arsenic

Zn

Zinc

Author Contributions
An Nguyen Thi Ngoc is the sole author. The author read and approved the final manuscript.
Conflicts of Interest
We declare no conflicts of interest.
Appendix
Table 5. Wild herbs .

N0

Quantity

Vietnamese names

Scientific names

Families

1

++

Ô rô

Acanthus ebracteus Vahl

Acanthaceae

2

++

Trái nổ

Ruella tuberosa L

Acanthaceae

3

+

Cỏ sướt

Achyranthes aspera L.

Acanthaceae

4

+

Nở ngày đất

Gomphrena celosioides Mart

Acanthaceae

5

++

Từ cô thon

Sagittaria sagittaefolia L

Alismaceae

6

++

Dền gai

Amaranthus spinosus L

Amaranthaceae

7

+

Mướp xác vàng

Cerbera odollarn Gaertn

Apocynaceae

8

++

Lòng mức lông

Wrightia pubescens R.Br subsp lanati (Bl) Ngân

Apocynaceae

9

++

Môn nước

Colocasia esculenta (L) Schott

Araceae

10

++

Bèo cái

Pistia stratiotes L

Lemnaceae

11

+

Cỏ cứt heo

Ageratum conyzoides L

Asteraceae

12

+

Cỏ mực

Eclipta prostrata L

Asteraceae

13

+

Chân voi nhám

Elephantepus scaber L

Asteraceae

14

+

Cỏ chua lè

Emilia sonchifolia (L) DC

Asteraceae

15

*

Cỏ hôi

Eupatorium odoratum L

Asteraceae

16

++

Lúc

Pluchea indica Lees

Asteraceae

17

++

Cúc hoang

Tridax procumbens L

Asteraceae

18

+

Bèo dâu

Azolla pinnata BR

Azollaceae

19

+

Vòi voi

Heliotropium indicum L

Boraginaceae

20

++

Màng màng tím

Cleome viscosa L

Capparaceae

21

+

Đầu riều, trai Ấn

Commelina bengalensis L

Commelinaceae

22

++

Trai thường

C. communis L

Commelinaceae

23

++

Bìm long

Ipomaea eriocarpa R. Br

Convolvulaceae

24

++

Bìm 3 thùy

I. triloba L

Convolvulaceae

25

++

Bìm vàng

Jacquemontia paniculata (Burm) Hall. F

Convolvulaceae

26

++

Bìm trắng

Merremia hederacea (Burm. f) Hall.F

Convolvulaceae

27

++

Cứt quạ

Gymnopetalum cochinchinensis (L) Kurz

Cucurbitaceae

28

++

Lác nước

Cyperus malaccensis Lamk

Cyperaceae

29

+

Cỏ cú

C. rotundus L

Cyperaceae

30

+

Cỏ chác

Fimbristylis miliacea (L) Vahl

Cyperaceae

31

+

Tai tượng Ấn

Acalypha indica L

Euphorbiaceae

32

+

Cỏ sữa lông

Euphorbia hirta L

Euphorbiaceae

33

+

Cỏ sữa lá nhỏ

E. thymifolia L

Euphorbiaceae

34

+

Chó đẻ

Phyllanthus urinaria L

Euphorbiaceae

35

+

Thầu dầu

Ricinus communis L

Euphorbiaceae

36

+

Thủy thảo

Hydrilia verticillata (L.f) Royle

Hydrocharicaceae

37

*

Bèo cám Nhật

Lemna japonica L

Lemnaceae

38

*

Nhĩ cán vàng

Utricularia aurea Lour

Lentibulariaceae

39

++

Trinh nữ, mắc cỡ

Mimosa pudica L

H/P Mimosoideae

40

++

Sục sục tái

Crotalaria pallida Aiton

H/P Mimosoideae

41

+

Sục sạc lõm

C.retusa L

H/P Mimosoideae

42

++

Cóc kèn

Derris trifolia Lour

H/P Mimosoideae

43

+

Mắc mèo

Mucuna pruriens (L) DC

H/P Mimosoideae

44

+

Đậu ma

Pueraria phaseloides (Roxb)

H/P Mimosoideae

45

+

Cối xay

Abytilon indicum (L) Sweet

Malvaceae

46

+++

Chổi đực

Sida aucuta Burm f

Malvaceae

47

+

Bái tà

S. rhombifolia ssp retusa (L) Boss

Malvaceae

48

+++

Ké hoa đào

Urena lobata L

Malvaceae

49

++

Muôi đa hùng

Melastoma affine D. Don

Melastomaceae

50

++

Muôi lông

M. saigonense (Kuntze) Merr

Melastomaceae

51

*

Lục bình

Eichhornia crassipes (Maret) Solm

Pontederiaceae

Note:
Classifying according to Professor Pham Hoang Ho, book: “Trees of Vietnam country”, (1991 -1993), chapter 1 – 5, Montreal Publishing.
The list of names according to order: A, B, C, D
Symbol: +: little ++: average
+++: much : very much
References
[1] National Library of Medicine “Medicinal plants”, Available from:
[2] National Library of Medicine “Medicinal plants”, Available from:
[3] James Shelton (1953), “Vegetable Growing”, Agricultural Publishing, pages 15, 16.
[4] Lee Sing Kong (1984), “From garden to kitchen: Grow your own fruit and vegetables”, Agricultural Publishing, pages 4-5, 18.
[5] An Nguyen Thi Ngoc (1996), Book: “The necessaries trees on garden in the South of Vietnam”, Agriculture Publishing, Ho Chi Minh City, pages 12,13,14.
[6] An Nguyen Thi Ngoc (2010), Book: “The trees to cure the diseases and an environment”, Agriculture Publishing, Ho Chi Minh City, pages 30-32.
[7] An Nguyen Thi Ngoc (2020), Book: “Study about an environment to plant the clean vegetables in order to serve the people”, Agricultural Publishing, Ho Chi Minh City, ISBN 978-604-60-3251-9, pages 25-31.
[8] An Nguyen Thi Ngoc (2022), Book: “Food safety and hygiene and environment”, Agricultural Publishing, Ho Chi Minh City, ISBN 978-604-60-3575-6, pages 88- 92.
[9] An Nguyen Thi Ngoc (2022), Book: “Nutritional food and environment”, Agricultural Publishing, Ho Chi Minh City, ISBN 978-604-60-3579-4, pages 43- 49.
[10] An Nguyen Thi Ngoc (2022), Book: “Study about the clean vegetables on the mountainous areas and the planting method”, Agricultural Publishing, Ho Chi Minh City, ISBN 978-604-60-3470-4, pages 20-30.
[11] Chinh Nguyen Manh – Mai van Quyen – Nguyen van Nghia (2005), “Doctor of the planting trees”, Agricultural Publishing, Ho Chi Minh City, pages 18, 19.
[12] Ho Pham Hoang (1991 - 1993), Book: “The vegetables of Vietnam country”, Montreal Publishing, Chapter 2: pages 570, 571; Chapter 3: pages 241, 245, 247, 351.
[13] Ho Pham Hoang (2006), Book: “The medical trees at Vietnam”, Tre Publishing, Ho Chi Minh City, pages 720, 721.
[14] Hoan Nguyen Van (2001), Book: “The nutrient vegetable gardens of households”, Agricultural Publishing, Hanoi City, pages 43, 44.
[15] Journal of Popular science (2007), “Valuable remedies from medicinal plants”, number 87 (825), Ho Chi Minh City, pages 23,24.
[16] Medicinal Ministry (2011), Book: “National Technical regulation on the limits of heavy metals contamination in food”, pages 4, 6, 8.
[17] Tuc Tran The (1994), Book: “The men plant gardens", Agricultural Publishing, Ho Chi Minh City, pages 145,146.
Cite This Article
  • APA Style

    Ngoc, A. N. T. (2025). An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City. International Journal of Applied Agricultural Sciences, 11(3), 94-100. https://doi.org/10.11648/j.ijaas.20251103.14

    Copy | Download

    ACS Style

    Ngoc, A. N. T. An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City. Int. J. Appl. Agric. Sci. 2025, 11(3), 94-100. doi: 10.11648/j.ijaas.20251103.14

    Copy | Download

    AMA Style

    Ngoc ANT. An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City. Int J Appl Agric Sci. 2025;11(3):94-100. doi: 10.11648/j.ijaas.20251103.14

    Copy | Download

  • @article{10.11648/j.ijaas.20251103.14,
      author = {An Nguyen Thi Ngoc},
      title = {An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City},
      journal = {International Journal of Applied Agricultural Sciences},
      volume = {11},
      number = {3},
      pages = {94-100},
      doi = {10.11648/j.ijaas.20251103.14},
      url = {https://doi.org/10.11648/j.ijaas.20251103.14},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijaas.20251103.14},
      abstract = {Vegetables are foods everyone, very nutritious and necessary for the men in life, they can’t be insufficient, especially, vegetables cure the diseases, too. Here, we want to speak to the pumpkins. This is a kind agricultural produce which are planted generally in Vietnam country, the flowers, leaves, buds and fruits are used in order to eat, too. Pumpkins have the vitamins A, vitamins B and another nutrient, delicious. Fruits of pumpkin are not only eaten but also cure diseases such as: Brighten eyes, headache, tonic, help a strong memory; and grains can cure the worms. Pumpkins – vegetables, everyone provides the from the suburbs district such as: Binh Chanh, Hoc Mon, Cu Chi, Go Vap … and the provinces such as: Long An, Tien Giang, Tay Ninh… very much. In a season of epidemic Covid-19 ago, at the year 2021, the population of Ho Chi Minh City have many, many hard works because they are an insulation, the market assembles, it is that the autos do not run, the population of many provinces do not can transmit to the city, total works hold back many activities are stopped, the foods are rare, vegetables do not remain because they are destroyed, especially, there are only the kinds of Autum Squash, the gourd family, which the pumpkins they have money nutrient to eat, can to get many days, they do not destroy or they are destroyed rarely, everyone can put them many days in the house, the population likes eat the pumpkins, these are reasonable foods for the pours. In the report, we present food to plant, observe, analyze and study about heavy metals, insects, epidemics on the pumpkin in order to sure the health and give the nutrient for the persons.
    },
     year = {2025}
    }
    

    Copy | Download

  • TY  - JOUR
    T1  - An Accumulation of Heavy Metals on the Planting Pumpkins After COVID-19 in Ho Chi Minh City
    AU  - An Nguyen Thi Ngoc
    Y1  - 2025/06/26
    PY  - 2025
    N1  - https://doi.org/10.11648/j.ijaas.20251103.14
    DO  - 10.11648/j.ijaas.20251103.14
    T2  - International Journal of Applied Agricultural Sciences
    JF  - International Journal of Applied Agricultural Sciences
    JO  - International Journal of Applied Agricultural Sciences
    SP  - 94
    EP  - 100
    PB  - Science Publishing Group
    SN  - 2469-7885
    UR  - https://doi.org/10.11648/j.ijaas.20251103.14
    AB  - Vegetables are foods everyone, very nutritious and necessary for the men in life, they can’t be insufficient, especially, vegetables cure the diseases, too. Here, we want to speak to the pumpkins. This is a kind agricultural produce which are planted generally in Vietnam country, the flowers, leaves, buds and fruits are used in order to eat, too. Pumpkins have the vitamins A, vitamins B and another nutrient, delicious. Fruits of pumpkin are not only eaten but also cure diseases such as: Brighten eyes, headache, tonic, help a strong memory; and grains can cure the worms. Pumpkins – vegetables, everyone provides the from the suburbs district such as: Binh Chanh, Hoc Mon, Cu Chi, Go Vap … and the provinces such as: Long An, Tien Giang, Tay Ninh… very much. In a season of epidemic Covid-19 ago, at the year 2021, the population of Ho Chi Minh City have many, many hard works because they are an insulation, the market assembles, it is that the autos do not run, the population of many provinces do not can transmit to the city, total works hold back many activities are stopped, the foods are rare, vegetables do not remain because they are destroyed, especially, there are only the kinds of Autum Squash, the gourd family, which the pumpkins they have money nutrient to eat, can to get many days, they do not destroy or they are destroyed rarely, everyone can put them many days in the house, the population likes eat the pumpkins, these are reasonable foods for the pours. In the report, we present food to plant, observe, analyze and study about heavy metals, insects, epidemics on the pumpkin in order to sure the health and give the nutrient for the persons.
    
    VL  - 11
    IS  - 3
    ER  - 

    Copy | Download

Author Information
  • University of Natural Science, Vietnam National University, Ho Chi Minh City, Vietnam