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Latvia University of Agriculture - Latvijas Lauksaimniecības ...

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V. Jansons, R. Sudārs Dimensions <strong>of</strong> Agri-Environmental Research in the Department <strong>of</strong>Environmental Engineering and Water ManagementFig. 6. Probability curves for NO 3-N winter concentration in the drainage field run-<strong>of</strong>f.Recommendations for water quality (N totand P tot)standards in agricultural areasTable 2Qualityfielddrainagerun-<strong>of</strong>fN tot(mg L -1 ) P tot(mg L -1 )channel andmain drain run<strong>of</strong>ffielddrainagerun-<strong>of</strong>fchannel and maindrain run-<strong>of</strong>fHigh 0.250water quality standards. The research showed that in small agricultural streams goodchemical status represents concentrations <strong>of</strong>

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