The relationship of arsenic in the soil of area studies in Chiang Rai Province found relationship clearly is the area of CR2 is the depth of the more quantity of arsenic increase too loud 3.4 graph.3 correspond to relations with natural mineral, and in the study area and SP1 SP2 CR1 CR3 also ไม่ค่อยแสดง effect clearly. But there is a tendency to the relationship of the quantity of arsenic of soil depth with natural mineral
.Analysis of arsenic content in soil relationship with depth of the study area CR2 displayed the trend of variation of the NRC organic according to the depth of soil obviously
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