1.2. Artificial origin:
This is the cause of pollution of land across the world as well as in Vietnam. Firstly due to:
- The pressure of population growth requires increased food demand, food growing and to enhance the exploitation of soil fertility by several measures:
• Increase the use of chemicals such as fertilization muscle, herbicides, insecticides.
• use of growth stimulants reduce losses and generate resources for harvest.
• Expansion of irrigation systems.
- the acceleration of urbanization, industrialization and transportation network make the contaminated soil.
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