Özet:

Under irrigated conditions, a significant portion of the nitrogenous fertilizers used in the production of sugar beet (beta vulgaris saccarifera) are washed away, polluting the groundwater, which is extremely important for the local people. In order to prevent further contamination, there is a need for methods that quickly and accurately estimate the amount of fertilizer nitrogen moving below the root zone. This study was conducted to estimate the nitrate leaching parameters in 18 plots (total 252 m²) under irrigation conditions using the computer model NLEAP (Nitrate Leaching and Economic Analysis Package) at 0, 8.9, 15.5, 22.1, 31.0 and 44.5 kg N/ha nitrogen fertilizer treatments. The results showed that significant amounts of nitrate were leached under all fertilizer treatments except the control, posing a very high risk for groundwater contamination. In order to reduce nitrate leaching under the conditions of the study, it was recommended that nitrogen fertilizers should be divided, deep-rooted crops with high transpiration efficiency but not less economic value than sugar beet should be rotated and nitrogen fertilizer forms with lower mobility in the soil should be used in addition to limited water application.

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