%0 Research article
%T Cell wall thickness and tangential and radial cell diameter of fertilized and irrigated Norway spruce
%A Lundgren, Christina
%D 2004
%J Silva Fennica
%V 38
%N 1
%R doi:10.14214/sf.438
%U https://silvafennica.fi/article/438
%X Two Norway spruce nutrient trials were used to evaluate the effects of  fertilization and irrigation on transverse tracheid dimensions. Three  different treatments and a control (C) were used; daily irrigation (I),  daily liquid fertilization (IL) and an annual solid fertilization (F).  The nutrient optimisation was based on foliage analysis and both liquid  and solid fertilization essentially comprised the same amount of  nutrients but the latter was applied annually in solid form. The cell  measurements; cell wall thickness, radial and tangential cell widths,  were obtained using image analysis (SilviScan at CSIRO, Melbourne,  Australia). Mean annual cell wall thickness was decreased by  fertilization (F and IL) on both sites whereas no effect of the  irrigation on wall thickness could be detected. Radial cell width was  increased by treatment at Flakaliden but at Asa the effect of irrigation  and fertilization was reversed when the data structure i.e. development  from pith and out and annual ring width was taken into account.  Tangential cell width was not significantly affected by treatment at  Flakaliden. At Asa fertilization caused a small increase on tangential  cell width. Ring width was positively affected by treatment and is an  important factor explaining the effects on primarily cell wall thickness  and radial cell width.