#####18.97.14.89#####

Values for the assessment of the supply of macronutrients in g/100g (%)

Element	Spruce			Pine
	deficiency	not sufficient	sufficient	deficiency	not sufficient	sufficient
Nitrogen	< 1.31	1.31-1.50	> 1.50	< 1.31	1.31-1.60	> 1.60
Phosphorous	< 0.12	0.12-0.13	> 0.13	< 0.12	0.12-0.13	> 0.13
Potassium	< 0.34	0.34-0.42	> 0.42	< 0.43	0.43-0.50	> 0.50
Calcium	< 0.11	0.11-0.36	> 0.36	< 0.06	0.06-0.29	> 0.29
Magnesium	< 0.08	0.08-0.11	> 0.11	-	<= 0.06	> 0.06

These values are based on the values provided by GUSONNE 1964. They are still accepted and have been reconfirmed in the newer literature by BONNEAU 1988, VAN DEN BURG 1988 and FOERST et al. 1987.

Values for the assessment of macronutrient-ratios

Apart from the absolute concentrations of the macronutrients, their ratios to each other play an important role in the assessment of the nutritional situation as well. The following ratios describe the harmonious range in spruces (HÜTTL 1985):

Nutrient Ratio	Harmonious Range
N/P	>7 bis <10
N/K	>1 bis <3
N/Ca	>2 bis <7
N/Mg	>8 bis <14
K/Ca	>0,8 bis <2,4
K/Mg	>2,2 bis <6,4
Ca/Mg	>2,5 bis <5

Values for the assessment of the supply of micronutrients in mg/kg (ppm)

Element	Spruce				Pine
	deficiency	not sufficient	optimum	above optimum	deficiency	not sufficient	optimum	above optimum
Iron	< 20	20-29.9	30-180	> 180	< 20	20-29.9	30-180	> 180
Manganese	< 20	20-49.9	50-6000	> 6000	< 20	20-49.9	50-6000	> 6000
Zinc	< 15	15-29.9	30-60	> 60	< 15	15-19.9	20-70	> 70

These values are based on the values provided by BERGMANN 1993, VAN DEN BURG 1988 and FOERST et al. 1987.