Íslenskar landbúnaðarrannsóknir - 01.09.1977, Side 23

ÁHRIF BRENNISTEINSÁBURÐAR 21
HEIMILDIR — REFERENCES
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Boald, C. (1963): Mineral nutrition of plants in
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Dijkshoorn, W., Lampe, J. E. M., og Van Bnrg,
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Friðrik Pálmason (1972): Fosfór og kalíum í tún-
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Goodall, D. W., og Gregory, F. G. (1947):
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Hólmgeir Björnsson (1978): Analysis of responses
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Jóhannes Sigvaldason (1966, 1967): Rannsóknir
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Jónsson, Á.: Sjá Árni Jónsson.
Knauer, N. (1970): Úber den Einsatz der Pflan-
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Magnús Oskarsson (1977): Persónulegar heim-
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McNaught, K. J. (1958): Potassium deficiency in
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Möller-Nielsen, J., og Friis-Nielsen B. (1976):
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Oskarsson, M.: Sjá Magnús Oskarsson.
Pálmason, F.: Sjá Friðrik Pálmason.
Sigvaldason, J.: Sjá Jóhannes Sigvaldason.
Simán, G., og Jansson, S. L. (1976): Sulphur ex-
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Sumner, M. E. (1977): Preliminary NPK foliar
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Veðráttan: Ársyfirlit 1958—1962, 1967, 1970 og
1974. Veðurstofa íslands.