engleski

Nitrogen and phosphorus leaching from the hydromorphic soils of Bidj-Bosut field in Croatia

Aim of this study was to investigate nitrogen (N) and phosphorus (P) leaching from five hydromorhic soils of Bidj-Bosut field in the 2004- 2008 period. Total ten lysimeters were installed for percolate collection. Area covered by percolate flowing to 55 cm of depth was 0.2 m2 in form of plate (ø 50 cm). Average yearly applied fertilization (kg/ha) for the crops in different rotations (alfalfa, maize, wheat, barley and soybean) was 195 and 104, for N and P2O5, respectively. Average collected percolate was 172 mm with average variations among the years from 58 to 264 mm and among the sites from 135 to 201 mm. In average 172 mm or close to one fourth part of total precipitation (740 mm) were removed by percolation. Average N and P leaching by percolation (kg/ha) were 20.83 (N) and 0.77 (P) with average variation among the years from 9.11 to 43.46 (N) and from 0.45 to 1.34 (P) and among the sites from 7.22 to 29.51 (N) and from 0.52 to 0.98 (P), respectively. Average 13.79 kg N/ha or 66.2% of total N and 0.36 kg P/ha or 46.8% were leached in the autumn-winter period. Depended on the year, from 6.6% to 20.5% N and from 1.16 to 2.30% P added by fertilization were leached by percolation. General conclusion is that management practice of tested area is potential danger regarding ground and surface water pollution with nitrogen and considerably lower with phosphorus.

nitrogen ; phosphorus ; lysimeter ; leaching ; hydromorphic soils

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