Minerālā slāpekļa monitorings augsnē Vecaucē
2017
Lipenite, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Karklins, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture | Ruza, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture
Nitrogen fertiliser use is important factor for increase of crop yield and its quality parameters. However, environmental consequences, especially leaching of mineral forms of nitrogen in post-harvest period, should be taken into account. One of the risk areas is usage of equal fertiliser norms for fields where some areas are covered by mineral, but some – with organic soils. Therefore, field experiment was carried out in such situation where mineral nitrogen content in soil was monitored during vegetation separately for three layers: 0 – 30, 30 – 60 and 60 – 90 cm. Nitrogen off-take by crops’ yield and balance were calculated. Pattern of mineral nitrogen content in both soils was similar – rapid increase after the use of fertiliser, than decrease during vegetation due to its consumption and then increase again after harvesting. Amount of soil nitrogen pool for organic soil was significantly higher if compared with mineral one. Finally, the non-used nitrogen in organic soil after harvesting was also high, that might cause environmental risk due to its leaching. Therefore, differentiation of nitrogen norms is necessary measure to apply for fields where mineral soils alternates with organic ones.
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