Macro element nutrition of pine, spruce, and birch seedlings in nutrient solutions

Abstract

In the present paper a series of investigations from the years 1954-1960 is described.Pine (Pinus silvestris, L.), spruce (Picea abies, Karst.), and birch (Betula verrucosa, Ehrh.), the three domirrating forest tree species in Sweden, have been grown under controHed light and temperature conditians in nutrient solutions with varied concentrations of the macro nutrients.The main purpose has been to study the leaf analysis method as a diagnostic instrument in these species and to compare their nutritional properties, and a surveying study was regarded desirable for later investigations.Most of the results have been published in three papers in Physiologia Plantarum ( 66, 68, 69), bu t the limited s pace there has permitted only brie f discussions of the problems.Further more, it has not been possible in these papers to compare the results of the three species.It was, therefore, regarded of interest to publish the earlier data concerning macro nutrients tagether with recent orres in a more comprehensive paper where the results are treated in an uniform way.