Current issue: 54(4)
This study deals with significance of the number of needle year classes in estimating the nitrogen, phosphorus, potassium and magnesium status of Scots pine (Pinus sylvestris L.) plants on the basis of needle analysis. Due to the nutrient retranslocation deficiencies in these nutrients are best determined by analysing separately the needles of the topmost branch whorls possessing one, two or three needle year classes. The concentrations of those nutrients which are not scarce will then increase as needle year classes decrease. In cases of deficiency, on the other hand, the content of the nutrient concerned will remain the same or decrease. Only severe deficiencies are revealed by the examination of the nutrient concentrations of only the youngest or the oldest needles.
The PDF includes an abstract in English.
Fertilizer factory has been found to be harmful to the surrounding area through its fertilizing effect, mainly due to nitrogen compounds in the form of NOx and ammonium. In this study, pH, K, Ca and Mg contents in the humus layer were monthly monitored around a fertilizer industry in Oulu, Northern Finland, in 1975 and 1976. In addition, nutrient analyses were made in the leaves of Vaccinium vitis-idaea, V. myrtillus and Empetrum Nigrum.
The calcium, magnesium and potassium present in the emission of airborne fertilizer dust brought about an increase of the nutrient content of the surface top soil humus compared with the control samples. The nutrient contents of dwarf shrub leaves increased near the industrial site as compared with the controls. The potassium contents of Vaccinium myrtillus and Empetrum nigrum were exceptionally high. The results of this pilot study show that the overfertilization must have had an increasing effect on the nutrient status changes in the forest environment.