Silva Fennica

Fig. 1. Height (A) and diameter at breast height (DBH) (B) of fertilized and control Norway spruce in winter of 2012 at the age of 34 years. Line shows median, box represents 1st and 3rd quartile, whiskers mark range (not exceeding 150% of interquartile distance) and circles denote outliers of the datasets.

Table 1. Statistics of tree-ring parameters (minimum (MIN), maximum (MAX) and mean (MEAN) values and their standard deviation (SD) and coefficient of variation (VAR)) of crossdated datasets and p-values of differences (DIFF) in mean values of mean time series of tree-ring parameters of fertilized and control Norway spruce in Kalsnava, Latvia.
	MIN	MAX	MEAN	SD	VAR	DIFF
Maximum density, kg m^–3
Fertilized	258	1087	832	128	0.15
Control	376	1061	811	116	0.14	< 0.01
Mean density, kg m^–3
Fertilized	170	713	489	82	0.17
Control	144	760	495	86	0.17	0.69
Mean earlywood density, kg m^–3
Fertilized	84	638	400	86	0.22
Control	39	649	399	96	0.24	0.42
Mean latewood density, kg m^–3
Fertilized	229	931	692	113	0.16
Control	276	881	672	108	0.16	< 0.01
Tree-ring width, mm
Fertilized	0.59	9.20	3.54	1.65	0.47
Control	0.37	9.85	3.37	1.54	0.46	0.65
Proportion of latewood
Fertilized	0.06	0.88	0.32	0.15	0.49
Control	0.05	0.94	0.37	0.16	0.45	< 0.01

Table 2. Pearson correlation (r) and Gleichläufigkeit (GLK) coefficients calculated between mean time series of crossdated datasets of tree-ring parameter of fertilized and control Norway spruce in Kalsnava, Latvia for 1987–2013.
	r	GLK
Maximum density	0.40	0.77
Mean density	0.70	0.81
Earlywood density	0.66	0.69
Latewood density	0.53	0.55
Tree-ring width	0.88	0.81
Proportion of latewood	0.80	0.58

Fig. 2. Mean measurement (tree-ring width (A); proportion of latewood in tree-ring (B); maximum (C) and mean (D) wood density of tree-ring; earlywood (E) and latewood (F) density) time series and sample depth (G) of fertilized (black line) and control (grey line) Norway spruce. Asterisks indicate significance (p-value < 0.05) of differences between fertilized and control trees.