Íslenskar landbúnaðarrannsóknir - 01.09.1977, Page 49

Íslenskar landbúnaðarrannsóknir - 01.09.1977, Page 49
THE INOCULATION OF WHITE CLOVER 47 ÍSLENZKT YFIRLIT Smitun hvítsmára (Trifolium repens L.) með Niturnámsbakteríum {Rhizobium trifolii) á Islandi. Guðni Harðarson and D. Gareth Jones Department of Agrigultural Botany, University College of Wales, Aberystwyth Dyfed, Wales, U.K. Virkni niturnámsbaktería (Rhizobium trifolií) í samlífi við hvítsmára (Trifolium repens L.) var athuguð við mismunandi hitastig. Bakt- eríustofnarnir frá Islandi og Svíþjóð reynd- ust nema meira nitur (köfnunarefni) úr lofti REFERENCES Ek-Jander, J. and Eáhraeus, G., 1971: Adaptation of Rhizobium to subaraic environment in Scandinavia. Plant and Soil, Special Volume 1971: 129—137. Jensen, H. L., 1942: Nitrogen fixation in legumi- nous plants. II. Is symbiotic nitrogen fixation influenced by Azotobacter? Proceedings of the Linnean Society of New South Wales, '67: 205 —212. Jones, D. G., 1966: The contribution of white clover to a mixed upland sward. II. Factors af- fecting the density and effectiveness of Rhizo- bium trifolii. Plant and Soil, 24: 250—260. Jones, D. G., Druce, R. G. and Williams, G., 1967: Comparative trials of seed pelleting, inoculation and the use of high lime dressing in upland reclamation. Journal of applied Bac- teriology, 30: 511—517. Jones, D. G. and Harðarson, Guðni: Variation in the preference fo.r isolates of Rhizobium trifolii by homogenous and heterogenous populations of two white clover varieties. (Unpublished.) Jones, D. G. and Thomas, S. B., 1966: The use of inoculation and pelleting in the establish- ment of white clover under mountain condi- tions. Journal of applied Bacteriology, 29: 430 —437. við lágt hitastig en stofnar frá Bretlandi. Mikilvægt er að taka tillit til þessarar að- lögunar þegar smit er valið fyrir belgjurtir. Einnig er skýrt frá jarðræktartilraun á Korpu, þar sem smitun hvítsmára með nitur- námsbakteríum var reynd. Notaðir voru bakteríustofnar er best reyndust í fyrrnefndri athugun. Fáar Rhizobium bakteríur voru fyrir í jarðveginum og mikilvægi smitunar er auð- séð af niðurstöðum. Notkun kalks reyndist hvorki hafa marktæk áhrif á uppskeru né fjölda rótarhnýða. Notaðir voru hvítsmára- stofnarnir Aberystwyth S 184 og Pajbjerg smalbladet. Þeir reyndust ekki sem skyldi og lifðu ekki af fyrsta veturinn. Athugun þessi gefur ærið tilefni til að rannsaka fleiri er- lenda hvítsmárastofna jafnframt fræsöfnun og kynbótum á íslenzka hvítsmárastofninum. Jónsson, Ólafur, 1939: Belgjurtir, Áburðarsala ríkisins, Reykjavík, 118. Lie, T. A., 1974: Environmental effects on nodu- lation and symbiotic nitrogen fixation. ln the Biology of Nitrogen Fixation. Ed. Quispel, A. North Holland Publishing Company, Amster- dam and Oxford: 555—582. Norris, D. O., 1963: A porcelain-bead method for storing Rhizobium. Empire Journal of Experi- mental Agriculture, 31: 255—258. Pate, J. S., 1961: Temperature characteristics of bacterial variation in legume symbiosis. Nature, 192: 637—639. Steindórsson, Steindór, 1962: On the age and immigration of the Icelandic flora. Vísindafélag Islendinga, 35. Vincent, J. M., 1965: Environmental factors in the fixation of nitrogen by the Legume. In Soil Nitrogen. Eds. Bartholomew, W. V. and Clark, F. E., American Society of Agronomy, Madison. 384—435. Vincent, J. M., 1970: A manual for the practical study of root-nodule bacteria. Blackwell Scien- tific Publications, Oxford and Edinburgh. 164.
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