Fjölrit RALA - 15.12.2000, Síða 39

Fjölrit RALA - 15.12.2000, Síða 39
37 REFERENCES Bjömsson, H., 1993. Zones for performance testing of timothy (Phleumpratense L.) In the Nordic Countries. Acta Agric. Scand. Sect. B, Soil andPlant Sci. 43, 97-113. Deinum, B. & Dirven, J.G.P, 1975. Climate, nitrogen and grass. 6. Comparison of yield and chemical composition of some temperate and tropical grass species grown at different temperatures. Neth. J. agric. Sci. 23, 69-82. Eaton, G.W. & Meehan, C.N., 1971. Effects of leaf position and sampling date on leaf nutrient composition of eleven highbush bluebery cultivars. Journal of the American Society of Horticultural Science 96 (3), 378-380. Gillet, M., 1982. Carbon and nitrogen relationships in plants. Some practical consequences for grass. Proc. 9 th. Meeting ofEGF, Reading, England, 43-47. Helgadóttir, Á. & Bjömsson, H., 1994. Cooperative breeding for the northern marginal areas. Euphytica 77, 221-230. Knauer, N., 1970. Uber den Ersatz der Pflanzenanalyse zur Lösung verschiedener pflanzenbaulicher Fragen. Die Phosphorsáure 28, 236. Óskarsson, M. & Gudmundsson, B., 1971. Rannsóknir á vallarfoxgrasi (Engmo). Áhrif sláttutíma, köfnunarefnisáburðar og sambýlis við túnvingul á uppskeru og efnamagn vallarfoxgrass og gildi þess til heyverkunar. Journal of Agricultural Research in Iceland 3(2), 40-73. Simon, U. & Park, B.H., 1983. A descriptive scheme for stages of development in perennial Forage Grasses. XIV Internat. Grassl. Congr., pp. 416-418. Smith. D. & Jewiss, O.R., 1966. Effects of temperature and nitrogen supply on the growth of timothy (Phleumpratense L.).Ann. Appl. Biol. 58, 145-157. Thorsteinsson, I. & Ólafsson, G., 1965. The chemical composition and digestibility of some Icelandic range plants. Icelandic with english summar; University Research Institute, Department of Agriculture. Report, series A no. 17. Thorvaldsson, G., 1987. The effects of weather on nutritional value of timothy in northem Sweden. ActaAgric. Scand. 37, 305-319. Thorvaldsson, G., 1988. The Morphological and phenological development of timothy as affected by weather, and its relation to nutritional value. Acta. Agric. Scand. 38, 33-48. Thorvaldsson, G. & Fagerberg, B., 1988. Effects of weather on nutritional value and phenological development of timothy. SwedishJ. agric. Res. 18, 51-59.

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