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Silva Fennica 1926-1997
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Acta Forestalia Fennica
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Silva Fennica 1926-1997 vol. 8 no. 2 | 1974

Category: Article

article id 4903, category Article
Olavi Luukkanen. (1974). Esikokeita kinetiinin vaikutuksesta männyn hypokotyylien kallus- ja juurimuodostukseen. Silva Fennica vol. 8 no. 2 article id 4903. https://doi.org/10.14214/sf.a14747
English title: Effect of kinetin on the formation of callus and roots in hypocotyls of Scots pine; preliminary experiments.

After 64 days of aseptic culture, germlings of Pinus Syvestris L. were cut at the middle of the hypocotyl and above the root. The upper and lower halves of the hypocotyls were transferred onto agar medium RM-196 of Linsmaier & Skoog (1964) including 2 mg/l IAA and 0.1, 1 or 10 mg/l kinetin, one or both halves being put in each vial. Callus growth and root formation was observed after 55 days.

The lower ends of basally cut seedlings generally formed callus tissue and 20% of them also formed roots from this callus. No roots and less callus growth were observed in the lower hypocotyle halves excised at both ends. In the latter hypocotyles callus growth was promoted by the presence in the same vial of a basally excised germling, including cotyledons and plumule. Increasing amounts of kinetin slightly enhanced callus formation of basally excised germlings but seemed to inhibit callus growth in hypocotyls excised at both ends and placed alone on the growth medium. The total amount of callus was greatest in hypocotyls which included intact cotyledons and plumule.

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  • Luukkanen, ORCID ID:E-mail:
article id 4902, category Article
Carl Johan Westman. (1974). Urealannoituksen vaikutus metsämaan kasveille käyttökelpoiseen typpimäärään. Silva Fennica vol. 8 no. 2 article id 4902. https://doi.org/10.14214/sf.a14746
English title: Effect of urea application on nitrogen available for plants in forest soil.

The paper describes a preliminary attempt to assess the long-term effect of urea application on the quantity of nitrogen available for plants in forest soil. The soil samples required for the study were collected from an experimental area which had been set up for investigations into both the single and joint effect on tree growth of two levels of each of urea and phosphorus application. The stand was a mixed forest of Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) H. Karst.) on Myrtillus type site with an average volume of 217.5 m3/ha.

According to the results, the nitrogen available for plants of the humus layer was significantly higher in fertilized than in unfertilized plots as late as four years after application. In terms of absolute values, the quantities were extremely small, only 3–4% of the amounts applied. In comparison with these results it was interesting to notice that urea application seemed to increase the C/N ratio.

The PDF includes a summary in English.

  • Westman, ORCID ID:E-mail:
article id 4901, category Article
Veli Pohjonen. (1974). Istutustiheyden vaikutus eräiden lyhytkiertoviljelyn puulajien ensimmäisen vuoden satoon ja pituuskasvuun. Silva Fennica vol. 8 no. 2 article id 4901. https://doi.org/10.14214/sf.a14745
English title: Effect of spacing on the first-year yield and height increment of some species undergoing short rotation culture.

The effect of spacing on the first-year yield and height increment of Alnus incana (L.) Moench, Populus tremula L. x Populus tremuloides Michx. (Populus x wettsteinii), Salix ’Aquatica Gigantea’, and Salix phylicifolia L. was studied at the Arctic Circle Agricultural Experimental Station in Northern Finland. S. ’Aquatica Gigantea’ gave yields which were twice as high as those of the other species in the study. The highest yields were of the order of 60 tons per hectare (fresh yield including foliage). The annual height growth in S. ’Aquatica Gigantea’ was about 100 cm, in the others about 30–50 cm. S. ’Aquatica Gigantea’ had a maximal height growth when the distance between the seedlings was 25 cm.

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  • Pohjonen, ORCID ID:E-mail:
article id 4900, category Article
Pertti Harstela. (1974). Eräiden koneellistamisennusteiden herkkyydestä kustannustason muutoksiin. Silva Fennica vol. 8 no. 2 article id 4900. https://doi.org/10.14214/sf.a14744
English title: The influence of the change of cost level on some mechanization prognosis.

In this study a formula has been developed to describe the influence of the change of cost level on such a mechanization prognosis, where is assumed that wages and machine costs bear compound interest. In the study there are some numerical examples.

In the formula p1 = annual per cent increase of wages, p3 = annual per cent increase of machine costs, p2 = sudden and incident per cent increase of machine costs, and tv = delay in the profitability of mechanization.

The PDF includes a summary in English.

  • Harstela, ORCID ID:E-mail:
article id 4899, category Article
Matti Kärkkäinen. (1974). Näkökohta tyvi- ja latvaläpimitan keskiarvoon perustuvasta mäntypölkkyjen kuutioinnista. Silva Fennica vol. 8 no. 2 article id 4899. https://doi.org/10.14214/sf.a14743
English title: Note on the volume based on the mean of butt and top diameters of Scots pine bolts.

In this paper the use of butt and top diameters of pulpwood bolts for volume determination is analysed. The study is based on the taper data of Scots pine (Pinus sylvestris L.) stems. According to the results, the use of the mean of butt and top diameters in the volume determination under Finnish condition causes a positive error in small stems. If the stems are so big that the butt portions of the stems can be used as saw logs, the remaining top bolts, used as pulpwood, are estimated to be smaller than they are in reality. Accordingly, there is a negative error.

The PDF includes a summary in English.

  • Kärkkäinen, ORCID ID:E-mail:

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