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Values for the assessment of the supply of macro- and micronutrients
Values for the assessment of the supply of macro- and micronutrients

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.
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