Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2003
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No abstract has been registered
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Halvor SolheimAbstract
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Risto Seppälä Thomas RimmlerAbstract
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Petter Nilsen Gunnar AbrahamsenAbstract
Results from two fertilizer experiments in coniferous forest in south and southeast Norway with applications of nitrogen (N), magnesium (Mg) and phosphorous (P) are presented. A Scots pine stand has been fertilized annually for 9 years and one Norway spruce stand has been fertilized annually for 4 years. The aim of the study has been to investigate to what extent N fertilization in middle-aged stands of Scots pine and Norway spruce stimulates tree growth, and whether Mg and P counteract possible induced nutrient imbalances caused by high N doses. Both stands responded strongly to N addition and application of 30 and 90kgNha-1yr-1 resulted in a relative volume increment of 150 and 250%, respectively, compared to control. The increment effect in the pine experiment ceased after 4 years, but the difference between the two N doses was still significant after 9 years. The application of 1.5kgMgha-1yr-1 had just a slight significant positive effect on volume increment in two of the 9 years in the pine experiment, while no effect of 5.3kgPha-1yr-1 on volume increment was found. Needle nutrient concentrations were mainly affected by the N treatment and concentrations above 30mgg-1 was detected in the pine experiment. The concentration of P, Mg and K was negatively affected by the highest N dose in the spruce experiment, but not in the pine experiment. The imbalanced nutritional status created by N application was partly reduced by the P and Mg addition, but no substantial effect on tree growth has been detected so far. The stands have a large potential for accumulating N in the standing biomass and judged from the effect on nutrient concentrations and growth, Mg might be the next element that could limit tree growth by a continued high N atmospheric input.
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Halvor B. Gjærum Mary Namaganda Kåre LyeAbstract
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Vibeke LindAbstract
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Erlend Ystrøm Haartveit Dag FjeldAbstract
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Arne Sandnes Toril Drabløs EldhusetAbstract
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Arne Sandnes Toril Drabløs EldhusetAbstract
With small seedlings and dilute nutrient solutions, the use of glass beads as growth medium alters pH, conductivity and elemental composition of the solution to an extent that may affect the glass beads\" suitability as growth medium in plant cultivation experiments.
Authors
John DeromeAbstract
No abstract has been registered