Publikationer

Artikler i internationale tidsskrifter
Andersen, M.K. and Jensen, L.S. Low soil temperature effects on short term gross N mineralization-immobilization turnover after incorporation of a green manure. Soil Biology & Biochemistry submitted January 2000

*Eriksen, J. og Høgh-Jensen, H. (1998) Variation in the natural abundance of 15N in ryegrass-white clover shoot material as influenced by cattle grazing. Plant and Soil, 205, 67-76.

Eriksen J., Askegaard M. & Kristensen, K. (1999) Nitrate leaching in an organic dairy/crop rotation as affected by organic manure type, livestock density and crop. Soil Use and Management 15: 176-182.

Eriksen J. & Søegaard K. (2000) Nitrate leaching following cultivation of contrasting temporary grassland. Grassland Science in Europe. In press.

Eriksen, J. and Jensen, L.S. Soil respiration and nitrogen mineralisation in situ following cultivation of temporary pastures. Biology and Fertilty of Soils submitted March 2000.

Hansen B., Kristensen E.S., Grant R., Høgh-Jensen H., Simmelsgaard S.E. og Olesen J.E. (1998) Nitrogen leaching from conventional versus organic farming systems – a modelling approach. European Journal of Agronomy, (in press).

*Høgh-Jensen, H (1998) System theory as a scientific approach towards organic farming. Biological Agriculture and Horticulture, 16, 37-52.

Høgh-Jensen, H. and Schjoerring, J.K. (2000) Below-ground nitrogen transfer between different grassland species: direct quantification by 15N leaf feeding compared with indirect dilution of soil 15N. Plant and Soil, submitted.

*Jørgensen, F.V. and Ledgard, S.F. (1997) Contributions from stolons and roots to the total amount of N2 fixed by white clover (Trifolium repens L.). Annals of Botany 80, 641-648

*Jørgensen, F.V., Jensen, E.S. and Schjørring, J.K. 1999. Dinitrogen fixation in white clover grown in pure stand and mixture with ryegrass estimated by the immobilized 15N isotope dilution method. Plant and Soil 208, 293-305.

Magid J., Henriksen O., Thorup-Kristensen K. and Mueller T.: Disproportionately high N-mineralization rates from green manures at low temperatures - implications for modeling and management in temperate agro-ecosystems. Plant and Soil, submitted January 2000.

*Vinther. F. P. (1998) Effects of animal excreta on biological nitrogen fixation in grass-clover. Plant and Soil 203, 207-215.

*Vinther, F. P. & Jensen, E. S (2000) Estimating legume N2 fixation in a grass-clover mixture of grazed organic cropping systems using two 15N methods. Agriculture, Ecosystems & Environment 78, 139-147.

Hansen, J. P. & Vinther, F. P. (2000) Spatial variability of symbiotic N2 fixation in grass-white clover pastures estimated by the 15N enriched method and the natural 15N abundance method. Plant and Soil (submitted)

* Artiklen er delvist baseret på denne bevilling.

Indlæg ved kongresser, symposier og lignende
Eriksen , J. and Askegaard, M. 1998. Nitrate leaching in a dairy crop rotation as affected by organic manure type and livestock density. Proceedings of the World Congress of Soil Science, Montpellier, August, 1998.

Eriksen J. 1998: Nyeste resultater vedr. kvælstofomsætning på økologiske brug. I ”Bilag til Efterårskonference” s 18-19. 29. september 1998, Hotel Nyborg Strand.

Eriksen J. 1998: Kløvergræssets forfrugtsværdi og udvaskning af næringsstoffer. I ”Bilag til Økologisk Konference 1998”, 23 november 1998, Vingstedcentret.

Eriksen, J., Høgh-Jensen, H. and Møller Hansen, E. (1999) Using natural abundance of 15N for estimating biological nitrogen fixation in animal-grazed grass-clover. Workshop transactions for 10th Nitrogen Workshop, 23-26 August 1999, held at KVL, Copenhagen. pp. III.21.

Hauggaard-Nielsen H., Ambus P. and Jensen E. S. (1999). Intercropping of pea and barley to improve nitrogen use-efficiency in low-input agricultural systems. Poster and short paper to the 10th Nitrogen Workshop, 23 - 26 August, Copenhagen, Denmark.

Hauggaard-Nielsen H., Ambus P. and Jensen E. S. (1999). Improved use of N sources by pea-barley intercropping in low-input systems. Short paper and oral presentation to the 12th Australian Nitrogen Fixation Conference, 17 - 22 October, Wagga Wagga, NSW, Australia

Hauggaard-Nielsen H., Ambus P. and Jensen E. S. (2000). Using 15N and 32P methodology to study temporal and spatial root dynamics in pea-barley sole and inter-cropping. Short paper and poster to the International Symposium on Nuclear Techniques in Integrated Plant Nutrient, Water and Soil Management, 16 - 20 October, Vienna, Austria.

Hauggaard-Nielsen H., Ambus P. and Jensen E. S. (2001). Improved use of field N sources using pea-barley intercropping – how to choose the right pea variety to increase input from N fixation. Short paper and oral presentation to the 4th European Conference on grain legumes: Towards the sustainable production of healthy food, feed and novel products, 8 - 12 July, Cracow, Poland. (in prep.)

Høgh-Jensen, H., Ralf Loges, Erik Steen Jensen, Finn V. Jørgensen og Finn P. Vinther (1998) Empirisk model til kvantificering af symbiotisk kvælstoffiksering i bælgplanter. Page 69-82. In Kvælstofudvaskning og -balancer i konventionelle og økologiske planteproduktionssystemer (eds.: Kristensen E.S. og Olesen J.E.). FØJO Rapport nr. 2.

Høgh-Jensen, H.: Water and Nitrogen stress on N2 fixation, N transfer, and Water Use in mixtures of clover and grass. At: “Studying Stress in Ecological Systems: Pure and Applied Perspectives”, afholdt på Roskilde University Center, 21-24 june, 1997.

Høgh-Jensen (1999) An optimal proportion of green fallow in stockless farming systems: grain yield, nitrogen leaching and soil organic matter. In: Designing and testing crop rotations for organic farming (eds.: Olesen J.E., Eltun R., Gooding M.J., Jensen E.S. & Köpke U.). DARCOF Report no. 1. pp. 223-234.

Høgh-Jensen, H. and Jan K. Schjørring (1998) Biological nitrogen fixation in grass-clover leys and its transfer to subsequent crops. In Mixed Farming Systems in Europe (eds.: Van Keulen H., Lantinga E.A.& Van Laar H.H.).. Workshop Proceedings, Dronten, The Netherlands, 25-28 May 1998. A.P. Minderhoudhoeve-reeks nr. 2. pp. 185-190.

Høgh-Jensen, H. and Schjoerring, J.K. (1999) Biological nitrogen fixation under phosphorus and potassium limiting conditions. Workshop transactions for 10th Nitrogen Workshop, 23-26 August 1999, held at KVL, Copenhagen. pp. I.9.

Høgh-Jensen H., Rubæk G. and Schjørring J. K. (2000) The effect of P- and K-deficiencies on the structure and quality of grass-clover communities. In: Grassland Farming. Balancing environmental and economic demands. Proceedings of the International Occasional Symposium of the European Grassland Federation, Aalborg, Denmark, 20-25 May 2000. pp. xx-xx.

Jensen, E. S., Høgh-Jensen, H., Jørgensen, F., Schjoerring, J. K. and Vinther, F. P. (1996) Management of biological nitrogen fixation in grass/clover pastures. In ‘New Research in Organic Farming’. Eds. N.H. Kristensen and H.Høgh-Jensen, Proceedings from 11th IFOAM Scientific Conference, Copenhagen 11-16 August 1996, IFOAM, Tholey-Theley, ISBN 3-930720-99-X., pp. 89-96.

Jensen, E.S. 1998. Competition for and utilisation of nitrogen sources by intercrops of pea and barley. In: Van Cleemput, O., Haneklaus, S. Hofman, G. Schnug, E. and Vermoesen, A. Proceedings of the 11th International World Fertilizer Congress, Gent 7-13 Sept. 1997, volume II, p652-659.

Jensen, E.S., Jørgensen, F.B., Vinther, F.P., Høgh-Jensen, H. & Schjoerring, J.K. (1997) Biologisk kvælstoffiksering, -recirkulering og -udvaskning. Temadag i Økologisk Jordbrug d. 10. juni, SP Rapport nr. 15., pp. 101-106.

Jensen L.S., Andersen M.K. (1999) Short term N mineralization-immobilization turnover in soil after incorporation of green manures as a function of plant litter quality and soil temperature - A comparison of analytical models with the numerical model FLUAZ. In: 10th Nitrogen Workshop – Programme and Abstracts. Copenhagen, Denmark.

Jensen L.S., Andersen M.K., Thorup-Kristensen K., Mueller T. and Magid J. (1999): In situ measurements of gross N-mineralisation-immobilization turnover in soil as related to soil biological activity after incorporation of catch crops. In: 10th Nitrogen Workshop – Programme and Abstracts. Copenhagen, Denmark.

Jensen L.S, Mueller T, Eriksen J, Thorup-Kristensen K and Magid, J (1999) Simulation of plant production and N fluxes in organic farming systems with the soil-plant-atmosphere model DAISY In: J.E Olesen, R. Eltun, M.J. Gooding, E.S. Jensen and U. Köpke (Eds.) 1999: Designing and Testing Crop Rotations for Organic Farming. DARCOF Report no. 1. Research Centre for Organic Farming, Denmark. 235-247.

Jensen L.S., Haugaard-Nielsen H., Eriksen, J., Mueller T. and Magid J. (1999) Modelling carbon and nitrogen turnover in soil and crop growth after incorporation of clover

Jørgensen, F.V. (1999) Effect of defoliation on N-remobilization during regrowth in white clover. Poster og abstract præsenteret ved 10th Nitrogen Workshop 23 – 26 august 1999. Den Kongelige Veterinær og Landbohøjskole, København.

Magid J., Askegaard M., Jensen E.S., Kristensen E.S. and Kristensen K.T. (1996). N efficiency in organic food production - considerations for the future. In ‘New Research in Organic Farming. Eds. N.H. Kristensen and H. Høgh-Jensen, Proceedings from 11th IFOAM Scientific Conference, Copenhagen 11-16 August 1996, IFOAM, Tholey-Theley, ISBN 3-930720-99-X. pp. 56-57.

Magid J., Jensen L.S., Mueller T. and Nielsen N.E. (1998) Dynamics of Carbon, Nitrogen and Quality Indicators in Particulate Organic Matter - applicability of size and size-density separation in process studies. Poster presented at the 16th World Congress of Soil Science, 20. - 26. August 1998 in Montpellier.

Magid J., Mueller T., Luxhøj J., Henriksen O., Lyshede O. and Thorup-Kristensen K. (1999): Decoupled N and C cycling at low temperatures - implications for green manure efficiency in temperate agro-ecosystems. In: 10th Nitrogen Workshop – Programme and Abstracts. Copenhagen, Denmark.

Mueller T., Jensen L.S., Thorup-Kristensen K. and Magid J. (1999): Nitrogen turnover in soil after incorporation of plant materials with different quality in organic farming systems - Simulation of Lab- and field experiments with the DAISY Model. . In: 10th Nitrogen Workshop – Programme and Abstracts. Copenhagen, Denmark.

Mueller T., Thorup-Kristensen K., Stoumann Jensen L and Magid J. (1998): The decomposition of green manure and catch crop residues in soils from organic farming. Poster presented at the 16th World Congress of Soil Science, 20. - 26. August 1998 in Montpellier.

Søgård, K., Petersen, S. O. & Vinther, F. P. (1996). The effect of N in urine on herbage production, N-fixation and ammonia volatilization. In: Grassland and land use systems (Eds. G. Parente, J. Frame and S. Orsi), 16th EGF Meeting, Italy, Vol 1, p. 615-620.

Thorup-Kristensen K., Müller T. and Magid J. (1997). Cover crops and nitrogen management - exploring limitations and the applicability of the DAISY model. In: Schröder J.J. (ed.): Long term reduction of nitrate leaching by cover crops, Second progress report of EU concerted action (AIR3) 2108, Wageningen, p.207-216.

Vinther, F. P. (1997). Biological nitrogen fixation in grass-clover affected by animal excreta. 11th World Fertilizer Congress, 7 - 13 September, Gent, Belgium. p.327.

Vinther, F. P. (2000). Symbiotic nitrogen fixation and N-transfer in a grass-white clover mixture. 18th General Meeting for the Eurpoean Grassland Federation (EGF2000), 22 – 25 May, Aalborg, Denmark. In press.

Vinther, F. P. & Jensen, E. S. (1996). Biological nitrogen fixation in an organic farming system. International Federation of Organic Agriculture Movements, 11th IFOAM Scientific Conference, 11-15 August, Copenhagen, Denmark.

Vinther, F. P. & Aas, O. (1996) Effects of urine on biological nitrogen fixation in a grass-clover pasture. Transactions of 9th Nitrogen Workshop, 9-12 Sept., Braunschweig, Germany, p. 173-176.

Vinther, F. P., Søgaard, K. & Aas, O. (1997). Biological nitrogen fixation in a grass-clover pasture grazed by dairy cows. Proc. 18th Int. Grassland Congr., Manitoba, Canada, June 8 - 19 . Vol. 1, pp. 10.17-10.18.

Faglige artikler
Eriksen J., Olesen J.E. & Hansen B. (1999) Hvordan kan kvælstofudvaskningen reduceres. Effektiv landbrug, Special, nr. 22:47-49.

Hauggaard-Nielsen H, Ambus P og Jensen E S (1999). Bland afgrøderne og høst mange fordele. Økologisk Jordbrug, nr. 198, 19.årgang.

Hauggaard-Nielsen H (1999). Forskning og formidling – bland afgrøderne og lad naturen klare resten. Personalebladet for Forskningscenter Risø, Riposten, 5. august.

Høgh-Jensen, H. (1997) Når kløvergræsset arbejder. Økologisk Jordbrug, 152, 13 juni. p. 5.

Høgh-Jensen, H. (1998) Kløverbestanden bestemmer systemets produktivitet. Forskningsnytt om økologisk landbrug i Norden, Nr. 7, pp. 6-7.

Jensen, E.S. og Jørgensen, F. (1997) Dansk forskningsprojekt: Kvælstoffiksering ved afgræsning. Forskningsnytt om Øekologisk Landbruk i Norden. Nr. 2, pp. 10-11.

Jensen, E.S. 1999. Kløvergræsmarkens økologi. Miljøforskning 29, 37-41

Jensen L.S. (2000) Høj kvælstofmineralisering fra fangafgrøder og grøngødninger selv ved lave vintertemperaturer. Forskningsnytt om økologisk landbruk i Norden. April 2000

Mødeindlæg/foredrag uden abstract
Høgh-Jensen, H.: The role of N2-Fixation, Water and Phosphor Limitations in Structuring White Clover-Ryegrass Communities. At “Effect of atmospheric CO2 increase on carbon fluxes in grassland ecosystems”. COST 619 ACTION meeting, Research Centre Foulum 18-21 June, 1998.

Høgh-Jensen, H.: Biological Nitrogen Fixation in Clover/Grass Leys and its Transfer to Subsequent Crops. At: “Workshop on Mixed Farming Systems in Europe”, Dronton/Wageningen, 25-28 May, 1998.

Schjørring, J.K.: Effects of elevated CO2 on carbon allocation in plants. At “Effect of atmospheric CO2 increase on carbon fluxes in grassland ecosystems”. COST 619 ACTION meeting, Research Centre Foulum 18-21 June, 1998.

Specialer, afhandlinger etc.
Christian Andreasen: N-strategi i kløvergræs. Vækst, morfologi og N2-fiksering. (Speciale, delprojekt 1.1)

Jacob P. Hansen: Variationer i N2-fixering i afgræsset kløvergræs. (Speciale, delprojekt 1.1)

Gitte Holm. Indflydelse af kvælstof, fosfor og kalium på etablering og symbiotisk N2 fiksering i Trifolium repens L. (speciale, delprojekt 1.3)

Vibeke Fabricius. Fosfors og kaliums indflydelse på vækst og udvikling i kløver og græs i renbestand og i blanding Botanisk sammensætning samt indhold og fordeling af kvælstof, fosfor og kalium i indsamlede plantefraktioner i hvidkløver (Trifolium repens L.) og alm. rajgræs (Lolium perenne L.) i løbet af en vækstsæson og en genvækstperiode efter slæt (speciale delprojekt 1.3)

O. Henriksen. Grøngødning I Økologisk Jordbrug - Temperaturens indflydelse på kvælstofmineraliseringen. (Bacheloropgave, delprojekt 2)

O. Tyrsted Jørgensen O. Green Manures as a Source of Nitrogen for a Succeeding Early Vegetable Crop (Speciale, delprojekt 2)

Lena Tinghuus. Speciale: Inkubationsforsøg i laboratoriet på KVL af semiintakte jordprøver fra Årslev og Foulum forsøgene (delmål 2)

Jens Pedersen Speciale vedrørende effekten af temperatur på N-mineralisering fra grøngødning (jord og plantematerialer fra Årslev) på KVL (delmål 2)

Claus Mose. Speciale om nedpløjningstidspunktet af kløvergræs med et markforsøg udført på Årslev og målingerne udført på KVL (delmål 2)

Mette Klint Andersen (ÅU) Speciale med bestemmelse af brutto-mineralisering og -immobilisering efter nedmuldning af grøngødninger både i laboratorie inkubationer og under feltforhold (delmål 2)

Jesper Luxhøi. Speciale vedrørende tidsmæssig variation i enzymaktiviteter samt kvalitetsparametre på grøngødning under nedbrydning (jord og plantematerialer fra Årslev) på KVL (delmål 2)

Oversigt over planlagte videnskabelige publikationer og faglige artikler
Hauggaard-Nielsen H, Ambus P and Jensen E S (2000). A field study of pea-barley intercrop dynamics and N use –increasing input of fixed N to the agro-ecosystem? (In prep).

Hauggaard-Nielsen H, Ambus P and Jensen E S (2000). Temporal root competition in pure and mixed pea-barley cropping – a field study using 32P methodology. (In prep.)

Hauggaard-Nielsen H and Jensen E S (2000). Genotype effects in relation to pea and barley performance in intercropping systems. Field Crops Research (In prep.)

Hauggaard-Nielsen H, Ambus P and Jensen E S (2001). The role of mixed pea-barley cropping in the N economy of rotation systems – a semi-field study using lysimeters. (In prep.)

Hauggaard-Nielsen H, Peoples M B, Ryan M, Jones T, McCallum M H, Angus J F, Ambus A and Jensen E S (2001). Effect of preceding crop species on post-harvest N mineralisation and subsequent crop growth in Australian Mediterranean agriculture. (In prep.)

Hauggaard-Nielsen H, Peoples M B, Ryan M, Reid B, Angus J F, Ambus A and Jensen E S (2001). Evaluating residual chemical indices of nitrogen mineralization when dealing with residues from legume-nonlegume sole and inter-cropping. An incubation study of carbon and nitrogen dynamics. (In prep.)

Jensen L.S., Thorup-Kristensen K., Mueller T and Magid J.: Gross N mineralisation-immobilisation turnover in soil as related to soil biological activity after incorporation of catch crops. To be submitted for Biology and Fertility of Soils.

Jensen L.S. and Eriksen J.: Simulation of N turnover and spring barley growth with the DAISY model following incorporation of grazed clover-grass pastures of varying quality. To be submitted for European Journal of Agronomy.

Luxhøi J., Magid J., Tscherko D. and Kandeler E.: Dynamics in Invertase, Xylanase and couled quality compounds of decomposing green and brown residues. To be submitted for Soil Biology and Biochemistry.

Mueller T. und Thorup-Kristensen K.: N-fixation of selected green manure plants. To be submitted for Plant and Soil.

Mueller T, Jensen L.S. and Magid J.: Does nitrogen turnover during decomposition of different plant residues depend on their quality parameters? – Experimental data and model simulations of a laboratory study. To be submitted for Biology and Biochemistry.

Mueller T, Jensen L.S. and Magid J.: Modelling the turnover of different green manure plants in the soil of an organic crop rotation - A field study. To be submitted for Ecological Modelling.