Các nhân tố ảnh hưởng đến sự tích lũy chì trong đất canh tác và rau tại phường Túc Duyên, thành phố Thái Nguyên, Việt Nam

Nguyễn Ngọc Sơn Hải và Đtg Tạp chí KHOA HỌC & CÔNG NGHỆ 85(09)/1: 111 - 117

Số hóa bởi Trung tâm Học liệu – Đại học Thái Nguyên 111 http://www.lrc-tnu.edu.vn

FACTORS AFFECTING LEAD ACCUMULATION IN CULIVATED SOIL AND

VEGETABLES IN TUC DUYEN WARD, THAI NGUYEN CITY, VIETNAM

Nguyen Ngoc Son Hai

1

, Chanchai Sangchayoswat2

,

Attachai Jintrawet2

, Nguyen Ngoc Nong1

*

1

Thainguyen University of Agriculture and Forestry - TNU

2ChiangMai University, Thailand

SUMMARY

This study was conducted with the purpose of determining the accumulation of lead (Pb) in

cultivated soil and three selected vegetables. Seventy five farmers who planted three selected

vegetables (jute, basella alba, and bitter melon) along Cau river in Tuc Duyen ward were randomly

selected for the study. Primary data were collected through formal interview questionnaires and

field survey. The data from field survey and formal questionnaires were analyzed using factor and

multiple regression analysis to determine the factors affecting Pb accumulation in cultivated soil

and the three selected vegetables. The main cause leading to the Pb accumulation in vegetables

highly due to vegetables absorbed Pb from farming environment, especially from cultivated soil

environment. Cultivated soil environment in the study area effected by the supplement of

substances containing Pb such as irrigation water source contaminated by wastewater sources from

sewage sludge, residential waste water, industrial waste water, etc. In addition is the solubility of

Pb in the acidic cultivated soil environment. We recommend that key stakeholders must be

participated in decision making process to reduce the accumulation of lead in both vegetables and

cultivated soils in Tuc Duyen ward.

Key words: Accumulation, lead (Pb), factor analysis, multiple regressions, vegetable, soil.

INTRODUCTION*

Thai Nguyen province is an industrial center

in northern region of Vietnam. It is the

headquarters of many factories, enterprises,

many major universities, colleges, schools

and large hospitals. Thai Nguyen city is

located on the bank of Cau river. Tuc Duyen

ward is the main vegetable production area of

Thai Nguyen city, with the largest vegetable

producing area and with the highest yield.

Problem about vegetable quality receives

much concern from consumers and

management organizations here, especially

accumulation of heavy metals in vegetable

products. Production process in many years

and quality of vegetables are much affected

by quality of water and soil contaminated

heavy metals, especially lead (Pb) due to this

area has affected by waste water sources from

many industrial zones, residential areas

around the study area through Cau river. The

purposes of this study were to determine the

*

Tel: 0983 640215

accumulation of lead (Pb) in cultivated soil

and in the three selected vegetables and to

determine the factors affecting lead (Pb)

accumulation in cultivated soil and the

selected vegetables.

METHODOLOGY

Seventy five farmers who planted three

selected vegetables (jute, basella allba and

bitter melon) along Cau river at Tuc Duyen

ward were selected for the study by using a

simple random sampling method. Location of

the fields where planting selected vegetables

was determined by GPS (Global Positioning

System) when collecting vegetables, water

and soil samples. Descriptive statistic, factors

and multiple regression analysis were used to

fulfill both objectives. Statistical Package for

Social Science (SPSS) and LIMDEP, a

program for factor analysis and multiple

regression, were used for data analysis.

RESEARCH RESULTS AND DISCUSSION

The accumulation of lead (Pb) in three

selected vegetables and in cultivated soil