Íslenskar landbúnaðarrannsóknir - 01.03.1979, Qupperneq 56

Íslenskar landbúnaðarrannsóknir - 01.03.1979, Qupperneq 56
54 ISLENZKAR LANDBÚNAÐARRANNSÓKNIR ÍSLENSKT YFIRLIT Smitun Lúpínu (Lupinus Nootkatensis Donn) með niðurnámsbakteríum á Islandi. Guðni Harðarson °g D. Gareth Jones Deþartmmt of Agricullural Botanji, University College of Wales, Aberystwyth SY23 3DD. Smitun lúpínu með niturnámsbakteríum var reynd í jarðræktartilraun í Keldna- holti, Gunnarsholti og á Skógarsandi, eftir að virkni nokkurra bakteríustofna við nit- ur (könnunarefnis) nám haíði verið reynd í ræktunarklefa í Wales. REFERENCES — HEIMILDIR: Einarsson, Þorleifur, 1962: Vitnisburður frjógrein- ingar um gróður, veðurfar og landnám á íslandi. Saga III: 442-469. (English summary). Einarsson, Þorleifur, 1963: Pollen analysis on the vegetation and climate history of Iceland in late postglacial times. In LOVE, A. and LOVE, D. (ed) North Atlantic biota and their history. Per- gamon Press, Oxford. p 355-367. Gadgil, R. L., 197la: The nutritional role ofLuþinus arboreus in coastal sand dune forestry. I. The pot- ential influence of undamaged lupin plants on nitrogen uptake by Pinus radiata. Plant and Soil, 34:357-367. Gadgil, R. L., 1971 b: The nutritional roleofLupinus arboreus in coastal sand dune forestry. II. The potential influence of damaged lupin plants on nitrogen uptake by Pinus radiata. Plant and Soil, 34:575-593. Stofn 3211 frá Rothamsted í Englandi reyndist virkastur við niturnám við 12°C hita í ræktunarklefa. Sami stofn myndaði einnig flest rótarhnýði og var virkastur við niturnám í jarðræktartilraunum á Islandi. Uppskera plantna í tilraunareitum smit- uðum með besta stofninum (3211) var u. þ. b. þrisvar sinnum meiri, eftir þriggja mánaða ræktun, heldur en í reitum þar sem ekki var smitað. Er því augljóst mikil- vægi smitunar lúpínufræs með virkum niturnámsbakteríum fyrir sáningu. Niðurstöður tilraunanna eru ræddar svo og hugsanleg notkun lúpínu við upp- græðslu. Gadgil, R. L., 1971 c: The nutritional role ofLupinus arboreus in coastal sand dune forestry. III. Nitrog- en distribution in the ecosystem before tree planting. Plant and Soil, 35:113-126. Gibson, A. H., 1963: Physical environment and symbiotic nitrogen fixation. I. The effect of root temperature on recently nodulated Trifolium sub- terraneum L. plants. Auslralian Journal of Biological Science, 16:28-42. Hardarson, Gudni and Jones, D. Gareth, 1977: The inoculation of white clover (Trifolium repens L.) with Rhizobium trifolii in Iceland .Journal of Agric- ultural Research in Iceland, 9 (2):39-46. Jensen, H. L., 1942: Nitrogen fixation in leguminous plants, II. Is symbiotic nitrogen influenced by Azotobacter? Proceedings of the Linnean Society of New South Wales, 67:205-212. Þorsteinsson, Ingvi, 1972: Gróðurvernd. Landvernd, Reykjavík. 128p.
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