Nitrate caused by decomposition of the fossil fuels, chemical fertilizers, animal husbandry, and human activities such as dumping into the river, which the EPA standard surface water respectively. NO3-N not exceeding 5.00 mg / L study found that the value of the most valuable NO3-N Site 1 (0.65 mg / L), followed by 3 Site, 2 Site, and Site 5 Site 4 which equals 0.49 edge, edge, 0.10 0.46 0.06 0.44 vector and vector 0.04 0.37 0.04 mg / L respectively. The increase of the concentration NO3-N may be caused by the degradation and human activities are main by Site 1 was NO3-N. Most due to the influence from the decomposition of litter the headwaters forestNitrate into water, the Site 3 have NO3-N followed by the first sampling point. There is a pool which this area soils are clones. The decomposition of litter and NO3-N valuable, including Site.It may be leaching into water, fertilizer, so the NO3-N higher Site 2 in fact แล้วค่า such should be higher Site 3 (if considering the degradation of vegetation areas upstream). But the Site 2 stream water is diluted.1 late. Therefore lower NO3-N Site 1 Site 3 and the Site 5 have high NO3-N scaled down. This may be due to the area is far from agricultural areas are reduced, but it may have been contaminated from other sources such asWhile Site 4 was NO3-N low compared to all Site from field survey, they were the highest since NO3-N near agricultural areas. This may be caused by errors in the experiment, which need to be further study
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