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ŠUMARSKI LIST 7-8/1969 str. 14     <-- 14 -->        PDF

LITERATURA


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Burger , H. (1948): Holz, Blattmenge und Zuwachs. IX. Die Föhre. .Mitt
Schweiz. Anst. forstl. Versuchw., 25, pp. 435—492.
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Dekanić , I. (1967): Intenziviranje proizvodnje proređivanjem mješovitih sastojina
nizinskih šuma. Jug. polj. šum. Centar, Beograd, 44 pp.
3.
Klepac , D. (1961): Rast i prirast, Zagreb, 299 pp.
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Kom leno vi ć, N. i Mart ino vic, J. (1966): Utjecaj plodnosti tla na rast
obične smreke u kulturi: »Vrelo« kod Jastrebarskog. Sum. List. 3/4, Zagreb, pp.
213—227.
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Krstinić , A. (1967): Varijabilnost i nasljednost boje izbojaka kod bijele
vrbe (S. alba L.) populacia Bakovci i Lipovljani. Šum. List, 5/6, Zagreb, pp.
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6.
Ley ton, L. (1958): The mineral requirements of forest plants. Band IV, Berlin,
pp. 1026—1039.
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Škorić , A. (1961): Pedološka istraživanja (priručnik), Zagreb.
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Ta mm, C. O. (1964): Determination of nutrient requirements of forest stands.
Int. Rev. For. Res., Vol. 1. New York, pp. 115—170.
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HEIGHT GROWTH AND CONTENT OF MINERAL NUTRIENTS
IN THE FOLIAGE OF INTRA — AND INTERSPECIFIC HYBRIDS
OF WHITE AND CRACK WILLOWS


Summary


When establishing forest cultures in the region of lowland forests an ever
increasing care has been paid recently to the arborescent species of the genus
Salix. For this reason an intensive work is under way in this country in the field
of selection and improvement of these species aiming at a production of clones
suitable for the cultivation in the mentioned localities. The authors are of the
opinion that for this purpose would serve best as initial stock spontaneous intraspecific
and interspecific hybrids of our autochthonous aborescent species of
Willows. Concurrently with the works on selection and improvement of arborescent
Willows it is also necessary to undertake intensive studies of their biological and
ecological characters. Within the framework of these problems an important
question is represented also by their requirements for mineral nutrients.


In this work was investigated the height growth of one- and twoyear-old intra-
and interspecific hybrids of White and Crack Willows in respect to the content of
N, P, K, Ca and Mg in the foliage.


The controlled intra- and interspecific hybridization was performed in the
open on grafted flowering branches and on one standing tree. Three clones were
used as female parents and four clones as male parents. When the cultivated
hybrid plants had developed the first pair of leaves they were set in beds at 10X20
cm. spacing in which they were cultivated for two years. The experiment was laid
out as a randomized block system (one-year seedlings in 4 replications and two-
year seedlings in 3 replications). The heights of plants were measured at the end
of the first and second growing seasons.


For the determination of mineral nutrient contents there were taken average
samples of leaves before they begun to yellow, and that from 18 plants per
replication (treatment). Immediately on taking samples of leaves, the leaves were
dried in a thermostat, first at 65°C, and after that at 105°C up to a constant weight.


The N-content in leaves was determined after K j e 1 d a h 1. For the determination
of the content of other biogenic elements in the foliage the dry matter
was burned by wet process (sulphuric and perchloric acids). From the solution K
and Ca were determined flame-photometrically, and P and Mg colorimetrically.