Íslenskar landbúnaðarrannsóknir - 01.09.1977, Page 23

Íslenskar landbúnaðarrannsóknir - 01.09.1977, Page 23
ÁHRIF BRENNISTEINSÁBURÐAR 21 HEIMILDIR — REFERENCES Arni Jónsson og Hólmgeir Björnsson (1964): Skýislur tilraunastöðvanna 1959—1960. Rit Landbúnaðardeildar. A. fl. nr. 16. Björnsson, H.: Sjá Hólmgeir Björnsson. Boald, C. (1963): Mineral nutrition of plants in soil. I, Plant Physology, A treatise. Ed. by F. C. Steward. Academica Press, N.Y. Cowling, D. W., og Jones, L. H. P. (1970): A deficiency in soil sulphur supplies for perennial ryegrass in England. Soil Sci. 110: 34'6—354. Dijkshoorn, W., Lampe, J. E. M., og Van Bnrg, P. F. J. (1960): A method of diagnosing the sulphur nutrition status of herbage. Plant and Soil 13: 227—241. Friðrik Pálmason (1972): Fosfór og kalíum í tún- grösum og grasspretta. Isl. landbúnaðarrann- sóknir 4: 15—31. Goodall, D. W., og Gregory, F. G. (1947): Chemical composition of plants as an index of their nutritional status. Techn. Comm. Imp. Bureau of Horticulture and Plantation Crops. No. 17. Hólmgeir Björnsson (1978): Analysis of responses to long-term P-fertilizer application when the errors are autoregressive. Obirt handrit. Jóhannes Sigvaldason (1966, 1967): Rannsóknir á brennisteinsskorti í íslenzkum túnum. I. Til- raunir með brennisteinsáburð á tún sumarið 1966. Ársrit Ræktunarfélags Norðurlands 63: 49—64. II. Tilraunir og athuganir með brenni- steinsáburð á tún sumarið 1967. Ársrit Rækt- unarfélags Norðurlands '64: 65—77. III. Nokkrar athuganir á brennisteinsmagni í jarð- vegi. Ársrit Ræktunarfélags Norðurlands 64: 113—126. Jones, L. H. P., Cowling, D. W., og Lockyer, D. R. (1972): Plant-available and extractable sul- phur in some soils of England and Wales. Soil Sci. 114: 104—114. Jónsson, Á.: Sjá Árni Jónsson. Knauer, N. (1970): Úber den Einsatz der Pflan- zenanalyse zur Lösung verschiedener Pflanzen- baulicher Fragen. Die Phosphorsáure 28: 236 —257. _ Magnús Oskarsson (1977): Persónulegar heim- ildir. McNaught, K. J. (1958): Potassium deficiency in Pastures. I. Potassium content of legumes and grasses. New Zealand J. Agr. Res. 1: 148—181. Metson, A. J. (1973): Sulphur in Forage Crops. Plant analysis as a guide to the sulphur status of forage grasses and legumes. Technical bul- letin No. 20, The Sulphur Institute. Möller-Nielsen, J., og Friis-Nielsen B. (1976): Evaluation and control of the nutritional status of cereals. I. Dry matter weight level. Plant and Soil 45: 317—-338. II. Pure effect of nutrient. Plant and Soil 45: 339—351. III. Methods of diagncsis and yield prognosis. Plant and Soil 45: 647—658. O’Connor K. F., og Vartha, E. W. (1969): Re- ponses of grasses to Sulphur fertilizers. New Zealand J. Agr. Res. 12: 97—118. Oskarsson, M.: Sjá Magnús Oskarsson. Pálmason, F.: Sjá Friðrik Pálmason. Sigvaldason, J.: Sjá Jóhannes Sigvaldason. Simán, G., og Jansson, S. L. (1976): Sulphur ex- change between soil and atmosphere, with special attention to sulphur release directly to the atmosphere. 2. The role of vegetation in sulphur exchange between soil and atmosphere. Swedish J. Agr. Res. 6: 135—144. Sumner, M. E. (1977): Preliminary NPK foliar diagnostic norms for wheat. Comm. in Soil Sci. and Plant Analysis 8: 149—67. Ulrich, A., og Hylton, L. O. (1968): Sulphur nutrition of Italian ryegrass measured by growth and mineral content. Plant and Soil 29: 274—• 284. Veðráttan: Ársyfirlit 1958—1962, 1967, 1970 og 1974. Veðurstofa íslands.
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