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Catch Crops in Organic Farming Systems without Livestock Husbandry - Simulations with the DAISY model Organic Eprints
Müller, Torsten; Thorup-Kristensen, Kristian; Magid, Jakob; Jensen, Lars Stoumann; Hansen, Søren.
This paper presents simulations of the soil-plant-atmosphere model DAISY based on an organic crop rotation with incorporation of different catch crops following pea as a leguminous cash crop. Special emphasise was put on the simulation of N-mineralisation/-immobilisation and of soil microbial biomass N. The DAISY model was able to simulate soil mineral N and soil microbial biomass N after soil incorporation of catch crop plant residues to some extend. Several processes need further attention and may be integrated into the DAISY model: (1) soil tillage induced mobilisation of organic material including considerable amounts of organic N, (2) winter killing of sensitive plant species and varieties, (3) decomposition of plant residues at the soil surface as...
Tipo: Journal paper Palavras-chave: Nutrient turnover; Crop combinations and interactions; Production systems; Air and water emissions.
Ano: 2006 URL: http://orgprints.org/7886/2/7886.pdf
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SimDen - en simpel model til kvantificering af N2O-emission og denitrifikation. Organic Eprints
Vinther, Finn P.; Hansen, Søren.
Denitrifikationen, som er særdeles vigtig både i landbrugs- og miljømæssig henseende, er en af de vanskeligste processer i kvælstof kredsløbet at kvantificere, idet den er kendetegnet ved en stor rumlig og tidslig variation. Der er brug for mange ressourcekrævende målinger for med rimelig sikkerhed at kvantificere denitrifikationen på markniveau. Eksperimentel bestemmelse af denitrifikationen er derfor oftest udelukket, og man må ty til matematiske modeller, hvis man ønsker at estimere hvad denitrifikationen har været, eller ønsker at vide hvad denitrifikationen måtte blive ved en given ændring i landbrugspraksis. Også modeller kan dog være vanskelige at håndtere, idet de fleste modeller kræver adgang til flere baggrundsoplysninger end det oftest er muligt...
Tipo: Report Palavras-chave: Nutrient turnover; Air and water emissions.
Ano: 2004 URL: http://orgprints.org/3139/1/SimDen.pdf
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Sorption of dissolved organic C and P to agricultural top- and subsoil Organic Eprints
Gjettermann, Birgitte; Styczen, Merete; Hansen, Søren; Borggaard, Ole K.; Hansen, Hans C.B..
In order to study the mobility of dissolved organic carbon (DOC) and dissolved organic P (DOP) in soil, the pH-dependent sorption of dissolved organic matter to an agricultural top- and subsoil was investigated. In general, sorption isotherms had convex shapes and DOC and DOP sorption increased with time of reaction. There was a very pronounced effect of pH resulting in much higher sorption of DOC at pH 5 than at pH 7; actually extensive desorption was observed at pH 7 especially for the topsoil. Similar sorption patterns were observed for DOP, but they were not as pronounced as for DOC.
Tipo: Conference paper, poster, etc. Palavras-chave: Environmental aspects; Nutrient turnover; Soil biology; Soil quality.
Ano: 2004 URL: http://orgprints.org/5391/1/5391.pdf
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A model simulation analyses of nitrate leaching – does soil organic matter pool structure or catch crop growth parameters matter most? Organic Eprints
Pedersen, Anders; Petersen, Bjørn Molt; Eriksen, Jørgen; Hansen, Søren; Jensen, Lars Stoumann.
Modelling of soil organic matter (SOM) turnover has often been developed in order to or to predict crop fertilser demand or to analyse environmental impact of different agriculture management practices. Mechanistic simulation models can be used to predict the mineralization of nitrogen (N) in added organic matter, e.g. from animal manure or incorporated crop residues, and the timing of N availability to the succeeding crops. In this way, mechanistic models may be used to avoid excessive fertilisation and hence to minimise nitrate leaching. The objective of this work was therefore to analyse the consequences of applying different SOM and crop modules (differing in pool structure or parameterisation) in the soil-plant-atmosphere model Daisy on the simulated...
Tipo: Journal paper Palavras-chave: Nutrient turnover Crop combinations and interactions Recycling; Balancing and resource management Air and water emissions.
Ano: 2007 URL: http://orgprints.org/4622/2/4622.pdf
Registros recuperados: 4
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