Summary
Nitrogenase activity was measured in young grey alder plantations in a peat bog in central Sweden. The stands were treated in three ways: (1) daily irrigation during the growing season with a complete nutrient solution, including N; (2) application of bark ash or wood ash before planting; and (3) fertilization every second year with solid PK fertilizers. Acetylene reduction assays were performed on (1) detached nodules and attached nodules, either on (2) whole enclosed plants or (3) enclosed nodules. The acetylene reduction rate for the enclosed plants showed a maximum in July when mean values of nearly 80 μmol C2H4 (g nodule dry matter)-1 h-1 were reached. No diurnal patterns were observed. The irrigated stands, with an N supply, showed overall nitrogenase activities that corresponded well with those of the other treatments. Only in the case of temporarily increased soil nutrient concentrations in the irrigated stands did the nitrogenase activity fall considerably. In 6-to 7-year-old intensively managed irrigated stands N2-fixation was estimated as 85–115 kg N ha-1 year-1 which was about 55% of the total N uptake of the trees.
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Rytter, L., Arveby, A.S. & Granhall, U. Dinitrogen (C2H2) fixation in relation to nitrogen fertilization of grey alder [Alnus incana (L.) Moench.] plantations in a peat bog. Biol Fert Soils 10, 233–240 (1991). https://doi.org/10.1007/BF00337373
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DOI: https://doi.org/10.1007/BF00337373