Evaluation of the quantity of heavy metals in Sisaket Province rice field ecosystem. A Thai national survey research by collecting samples of soil in rice planting areas be 69. For example, water and irrigation districts, for example, 60, for example, rice 69 samples and grain samples 35, for example, to analyze the quantity of heavy metals (copper, zinc, manganese and cadmium) by Atomic Adsorption soil-type Spectrophotometer total density of the soil. The acid-alkaline electric conductivity by standard methods.
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