REFERENCES

• Bowes , M. J. , Smith , J. T. , Jarvie , H. P. and Neal , C. 2008 . Modelling the phosphorus inputs to rivers from diffuse and point sources . Sci. Total Environ. , 395 ( 2–3 ) : 125 – 138 .
   PubMedGoogle Scholar
• Central Institute for Supervising and Testing in Agriculture (2009) Vývoj základních agrichemických vlastností zemědělských půd v České republice. http://www.zeus.cz/Articles/8931-2-Agrochemicke+vlastnosti.aspx (http://www.zeus.cz/Articles/8931-2-Agrochemicke+vlastnosti.aspx) (Accessed: 7 May 2009 ).
   Google Scholar
• Clarke , R. T. 1990 . Statistical characteristics of some estimators of sediment and nutrient loadings . Water Resour. Res. , 26 ( 9 ) : 2229 – 2233 .
   Google Scholar
• Cohn , T. A. 1995 . Recent advances in statistical methods for the estimation of sediment and nutrient transport in rivers . Rev. Geophys. , 33 : 1117 – 1123 .
   Google Scholar
• Correll , D. L. 1998 . The role of phosphorus in the eutrophication of receiving waters: a review . J. Environ. Qual. , 27 : 261 – 266 .
   Web of Science ®Google Scholar
• Ferguson , R. I. 1986 . River loads underestimated by rating curves . Water Resour. Res. , 22 ( 1 ) : 74 – 76 .
   Web of Science ®Google Scholar
• Grygier , J. C. , Stedinger , J. R. and Yin , H. B. 1989 . A generalized maintenance of variance extension procedure for extending correlated series . Water Resour. Res. , 25 ( 3 ) : 345 – 349 .
   Google Scholar
• Haggard , B. E. , Soerens , T. S. , Green , W. R. and Richards , R. P. 2003 . Using regression methods to estimate stream phosphorus loads at the Illinois River, Arkansas . Appl. Engng Agric. , 19 ( 2 ) : 187 – 194 .
   Google Scholar
• Hansen , N. C. , Daniel , T. C. , Sharpley , A. N. and Lemunyon , J. L. 2001 . The fate and transport of phosphorus in agricultural systems . J. Soil Water Conserv. , 57 ( 6 ) : 408 – 417 .
   Google Scholar
• Hart , M. R. , Quin , B. F. and Nguyen , M. L. 2004 . Phosphorus runoff from agricultural land and direct fertilizer effects: a review . J. Environ. Qual. , 33 ( 6 ) : 1954 – 1972 .
   PubMedGoogle Scholar
• Helsel , D. R. and Hirsch , R. M. 1992 . Statistical Methods in Water Resources , Amsterdam : Elsevier, Studies in Environmental Science 49 .
   Google Scholar
• Hirsch , R. M. 1982 . A comparison of four streamflow record extension techniques . Water Resour. Res. , 18 ( 4 ) : 1081 – 1088 .
   Web of Science ®Google Scholar
• Johnes , P. J. 2007 . Uncertainties in annual riverine phosphorus load estimation: impact of load estimation methodology, sampling frequency, baseflow index and catchment population density . J. Hydrol. , 332 : 241 – 258 .
   Web of Science ®Google Scholar
• Kalff , J. 2002 . Limnology , San Francisco, CA : Benjamin-Cummings Publishing Company .
   Google Scholar
• Kenney , B. C. 1982 . Beware of spurious self-correlations . Water Resour. Res. , 18 ( 4 ) : 1041 – 1048 .
   Web of Science ®Google Scholar
• Klement , V. and Sušil , A. 2005 . Porovnání vývoje agrochemických vlastností půd za období 1993–1998 a 1999–2004 , Brno, , Czech Republic : Central Institute for Supervising and Testing in Agriculture .
   Google Scholar
• Klement , V. and Sušil , A. 2009 . Porovnání vývoje agrochemických vlastností půd za období 1999–2002 a 2005–2008 , Brno, , Czech Republic : Central Institute for Supervising and Testing in Agriculture .
   Google Scholar
• Nash , J. E. and Sutcliffe , J. V. 1970 . River flow forecasting through conceptual models. Part I – A discussion of principles . J. Hydrol. , 10 ( 3 ) : 282 – 290 .
   Google Scholar
• Robertson , D. M. 2003 . Influence of different temporal sampling strategies on estimating total phosphorus and suspended sediment concentration and transport in small streams . J. Am. Water Resour. Assoc. , 39 ( 5 ) : 1281 – 1308 .
   Google Scholar
• Robertson , D. M. and Roerish , E. D. 1999 . Influence of various water quality sampling strategies on load estimates for small streams . Water Resour. Res. , 35 ( 12 ) : 3747 – 3759 .
   Web of Science ®Google Scholar
• Salas , J. D. 1993 . “ Analysis and modeling of hydrologic time series ” . In Handbook of Hydrology , Edited by: Maidment , D. R. 19.1 – 19.72 . New York : McGraw-Hill .
   Google Scholar
• Toor , G. S. , Harmel , R. D. , Haggard , B. E. and Schmidt , G. 2008 . Evaluation of regression methodology with low-frequency water quality sampling to estimate constituent loads for ephemeral watersheds in Texas . J. Environ. Qual. , 37 ( 5 ) : 1847 – 1854 .
   PubMedGoogle Scholar
• Vogel , R. M. , Rudolph , B. E. and Hooper , R. P. 2005 . Probabilistic behavior of water-quality loads . J. Environ. Engng , 131 : 1081 – 1089 .
   Google Scholar
• Vogel , R. M. and Stedinger , J. R. 1985 . Minimum variance streamflow record augmentation procedures . Water Resour. Res. , 21 ( 5 ) : 715 – 723 .
   Google Scholar