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Controlled Drainage and Wetlands to Reduce Agricultural Pollution

A Lysimetric Study

M. Borin*, G. Bonaiti and L. Giardini

Dipartimento di Agronomia Ambientale e Produzioni Vegetali, Università di Padova, Via Romea 16, 35020 Legnaro (Pd), Italy



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Fig. 1. Meteorological parameters as measured on the experimental site compared with measures obtained in the meteorological station situated on farmland. Rainfall in October 1998 refers only to first 10 d of month.

 


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Fig. 2. Nitrate nitrogen concentration in water (drainage and ground water data considered together) during the experimental period. Field operations, growing seasons, and N fertilizations (in g m-2 of N) are indicated on top.

 


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Fig. 3. Regression lines, after log-probit transformation, for NO3–N concentrations in drainage and ground water during the experimental period. On the x axis are also indicated (1) the European Union safe drinking water standard and (2) the limit for discharge in surface water.

 


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Fig. 4. Simulated rainfall, water volumes added (simulated rainfall + irrigation), and water volumes drained from lysimeters during the experimental period.

 


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Fig. 5. Nitrate nitrogen losses from lysimeters during the experimental period.

 





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