Nitrogen fixation, recycling and leaching

International publications

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 Agricul-ture 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)