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Beräkning av olika odlingsåtgärders inverkan på kväveutlakningen

beskrivning av ett pedagogiskt verktyg för beräkning av kväveutlakning från enskilda fält och gårdar

Aronsson, Helena and Torstensson, Gunnar (2004). Beräkning av olika odlingsåtgärders inverkan på kväveutlakningen. Technical Report. Uppsala: (NL, NJ) > Dept. of Soil Sciences > Div. of Water Quality Management, Sveriges lantbruksuniversitet. Ekohydrologi ; 78



An empirical method for estimation of nitrogen (N) leaching on field and farm level was presented. The work was financed by, and in corporation with, the Swedish Board of Agriculture. The method is a further development of a module in the data programme STANK (SJV, 2001) which is used for calculation of nutrient flows on farms. The main objective was to visualize important factors which contribute to the risk for N leaching, with focus on those which are easily influenced by measures taken in the field. To describe the general risk for N leaching, in a certain area on a specific soil, data were used from a project where N leaching in Sweden was estimated for different soils and crops (Johnsson & Mårtensson, 2002). Back‐ground leaching for different regions (289 communities) and soils (5 classes based on clay content) was calculated. The back‐ground leaching represented N leaching from a cereal crop with nitrogen applied as commercial fertilizer in appropriate amounts and with soil tillage in September to October. To estimate the total risk for N leaching under different conditions the following parameters were considered most important: Time for tillage Dose of fertilizer N in relation to recommended dose Time and technique for spreading of manure N fertilization during autumn N uptake in crops during autumn Residual effects of crops To calculate the effect of time for tillage, a factor (based on 5 soil texture classes and 6 classes for tillage) was multiplied with the back‐ground leaching. The other parameters were additive and based on an attempt to estimate the amounts of mineral N in the soil in comparison with the conditions in the "back‐ground" situation. Of the mineral N in the soil a certain fraction (0.1‐0.3, depending on clay content and climatic conditions) was assumed to contribute to N leaching. N uptake in crops during autumn was varied depending on the amount of mineral N present in the soil during autumn (including fertilization). The model was mainly based on an empirical approach but partly also process based. Results from field leaching experiments in Sweden, data in literature, experiences and numerous assumptions were used to make an overview of the different factors contributing to N leaching. With this model it is possible to estimate the risk for N leaching and to extract the effect of different measures taken in the field. The model showed good agreement with measurements in field experiments.

Authors/Creators:Aronsson, Helena and Torstensson, Gunnar
Title:Beräkning av olika odlingsåtgärders inverkan på kväveutlakningen
Subtitle:beskrivning av ett pedagogiskt verktyg för beräkning av kväveutlakning från enskilda fält och gårdar
Series/Journal:Ekohydrologi (0347-9307)
Year of publishing :2004
Number of Pages:27
Place of Publication:Uppsala
Publisher:Avdelningen för vattenvårdslära, Sveriges lantbruksuniversitet
Additional Information:Bilagorna saknas i filen.
Publication Type:Report
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Keywords:kväve, växtnäringsläckage, utlakning, avrinning, beräkningsmodell
Permanent URL:
ID Code:5378
Department:(NL, NJ) > Dept. of Soil Sciences > Div. of Water Quality Management
Deposited By: Melle Andersson
Deposited On:21 Sep 2010 00:00
Metadata Last Modified:02 Dec 2014 10:39

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