本研究主要在探討山葵園的非點源污染，由現場監測結果，得6場採集之地表逕流水各項水質平均濃度為：SS＝511 mg/L，PO43－-P＝2.56 mg/L，TP＝4.7 mg/L；NO3－-N＝1 mg/L，NH4+-N＝0.13 mg/L，Org-N＝0.45 mg/L，TN＝1.94 mg/L。
在地表逕流污染物年輸出量上，以模式法及回歸法推估。在模式法上，是應用降雨逕流之水文模式，配合土壤沖刷模式、溶解性營養鹽模式及沉積性營養鹽等水質模式模擬降雨期間地表逕流各污染物產量，並且以實測值率定模式中所需之參數。回歸法則以實測資料做回歸的推估，以此二法推估結果差異不大，由二法平均求得之地表逕流污染物年輸出量（單位：kg/ha-year）為：SS＝597，PO4－-P＝4.49，TP＝6.70，NO3－-N＝1.11，NH4+-N＝0.92，Org-N＝1.39，TN＝3.30。
以根區氮磷的收支平衡式及一維平流延散反應方程式（ADR），評估根區滲漏氮量及土壤累積量為667 kg N/ha-yr，而滲漏磷量及土壤累積量為243 kg P/ha-yr。
本研究評估營養鹽污染途徑除地表逕流外，滲漏水亦為一重要的非點源污染途徑，期望建立地表逕流水及滲漏水之水質模式架構，以作為農地非點源污染推估之參考。

This study aims at the simulation of non-point source(NPS) loading for a wasabi farmland. The model combines Distributed Rainfall-Runoff Model, soil erosion model, and nutrient model to simulate temporal variability of contamination loading during rainfall events. Furthermore, the calibration and verification process have been test in this study. On the other hand, the regression method is used based on the observed data and to compare with the results of the NPS model. The geometric mean concentration of surface runoff from 6 rainfall events is presented as follows: SS＝511 mg/L, PO43－-P＝2.56 mg/L, TP＝4.7 mg/L, NO3－-N＝1 mg/L, NH4+-N＝0.13 mg/L, Org-N＝0.45 mg/L, TN＝1.94 mg/L.
The export coefficients of surface runoff estimated by using the NPS model and the regression method. The results indicate that the two methods are similar. The export coefficients of surface runoff estimated by using the two methods indicated as(unit: kg/ha-year): SS＝597, PO4－-P＝4.49, TP＝6.70, NO3－-N＝1.11, NH4+-N＝0.92, Org-N＝1.39, TN＝3.30.
The infiltration term caused by leaching and accumulating in the soil is also evaluated by nutrient budget for the root zoon and one-dimensional advection-dispersion reaction equation (ADR). The amounts of N- and P-leaching and accumulation are 667 kg N/ha-yr and 243 kg P/ha-yr, respectively.
This study perhaps first confirmed that the leaching form is important for the non-point source pollution except for surface runoff. This study also establishes a framework of water quality models including surface runoff and infiltration terms to be a consultation for non-point source pollution within a watershed.

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