Current issue: 55(1)
Under compilation: 55(2)
In attempts to improve the autumn cereals, wheat and rye, hibernation plays an essential role. Those varieties that hibernate well should be marketed and others rejected. Concerning roots, it seems that varieties that hibernate well have more extent root system than those hibernating poorly.
Four varieties of rye were chosen for experiments, two that knowingly hibernate well and two that don’t. The experiments were grown in the Botanical gardens of the university and at the same time in experiment field in Tikkurila.
The results proof that plant hibernating well have more extensible roots than others and hence they survive better in frosting soil that extents.
The PDF contains a summary in English and in Finnish.
The growth of a tree or a forest stand can be only fully understood when the form, encroachment and development of the root s in different environments are known. Research on roots has already yielded in practical silvicultural improvements and the purpose of this study is to discuss different factors about the roots.
The literature review deals with the depth of root system, extent of it, the relation between root system and the soil structure, the form and volume of roots and the phenomenon where roots from several tree individuals grow together.
The PDF contains the article also in Finnish.
The root systems of 192 Scots pine (Pinus sylvestris L.) sample trees were dug out and measured in Säyneinen, Rautavaara and Pielijsäjvi in the Central Finland and Orivesi, Teisko and Hämeenkyrö in the Southern Finland. The volume of root system of Scots pine was always smaller than the stem, varying from 15% to 94% of the stem volume. The ratio is smaller in dense stands. The type of soil of the site affects how the central root system (tap root and the inner vertical roots) develop. This reflect the adaptability of the root system to different growth conditions. The root system may, for instance, substitute the tap root with stronger inner roots.
PDF includes a summary in English.