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Using GLOBE hydrosphere protocols, we assessed how cultivated farmlands around Jõulumäe influence nearby trench water quality at four sites spanning forest-adjacent trenches, a field-adjacent roadside trench, and a confluence with Leina stream. We measured the following parameters: pH, dissolved oxygen, conductivity, and water temperature, using Vernier sensors; transparency using a Secchi tube; and nitrate and alkalinity concentrations using Macherey-Nagel kits.  Nitrate concentration increased the more agricultural effect the trench had (growing from ≈0.2 mg/L at Jõulumäe trenches to ≈0.45 mg/L within fields and ≈0.7 mg/L at the downstream confluence), while conductivity and alkalinity were also rising in the same order (from ≈163 to 385 to 782 µS/cm, and from ≈155–210 to 310 to 450 mg/L CaCO₃). In contrast, dissolved oxygen tended to be lower at field-adjacent sites (≈1.7–2.6 mg/L) compared to Jõulumäe trench segments (≈3.1–4.3 mg/L). pH varied modestly (≈6.2–6.7), offering little evidence of alkaline fertilizers influence during the sampling window.  Overall, results indicate subtle agricultural signals (nitrate and ionic increases; lower dissolved oxygen) without visible nitrate pollution at the time of sampling. We recommend adding phosphate and ammonium measurements, reporting replicate statistics, quantifying trench geometry and flow for future monitoring.