The significance of the number of needle year classes of Scots pine in interpreting needle analysis results

Raitio, Hannu

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Silva Fennica vol. 21 no. 1 article id 5303 | 1987 | Article

Hannu Raitio

Neulasvuosikertojen merkitys neulasanalyysin tulkinnassa.

Raitio H. (1987). Neulasvuosikertojen merkitys neulasanalyysin tulkinnassa. Silva Fennica vol. 21 no. 1 article id 5303. https://doi.org/10.14214/sf.a15460

English title: The significance of the number of needle year classes of Scots pine in interpreting needle analysis results

Abstract

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.

Original keywords
mänty; ravinnepitoisuus; neulasvuosikerta; neulasanalyysi

English keywords
Pinus sylvestris; nitrogen; Scots pine; phosphorus; needle analysis; potassium; magnesium; needle year classes

Published in 1987

Available at https://doi.org/10.14214/sf.a15460 | Download PDF

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