DIGITALNA ARHIVA ŠUMARSKOG LISTA
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V. Roth, T. Dubravac, I. Pilaš, S. Dekanić, Z. Brekalo: KRUPNOĆA ŽIRA HRASTA LUŽNJAKA ... Šumarski list br. 5–6, CXXXIII (2009), 257-266 Jansen, S. J. 1993: Variation of growth in Danish zones and districts of Croatia. Rad. Šumar. inst. provenancetrials with oak (Quercus robur L. and 34 (2): 53–76, Jastrebarsko. Quercus petraea Liebl.). Ann. Sci. For. 50/ -Roth, V. 2001: Some characteristics of peduncled oak Suppl. 1: 203-207. Elsevier/INRA. (Quercus robur L.) Seedlings 1+0 originating Matić,S., N. Komlenović, S. Orlić, M. Orša -from different seed zones and seed units of Croa nić, 1996: Nursery production of pedunculate tia. U: Znanost u potrajnom gospodarenju hrvat oak. U: Hrast lužnjak u Hrvatskoj, 423–425. Hr-skim šumama. Znanstvena knjiga: 243–252, vatska akademija znanosti i umjetnosti, “Hrvat-Zagreb. ske šume” doo, Zagreb. Roth, V., T. Dubravac,2004: Results of an investiOrlić, S. 2000: Production of peduncled oak see-gation of the quality of acorn of peduncled oak dlings (Quercus robur L.) in Croatia from 1992 (Quercus robur L.) and sessile-flowered oak to 1998. Rad. Šumar. inst. 35 (1): 83–90, Jastre-(Quer cus petraea Liebl.) damaged by insects barsko. and fun gi. Rad. Šumar. inst. 39 (1): 5–18, Jastre barsko. Regent, B. 1972: U: Šumsko sjemenarstvo, 164–165. Poslovno udruženje šumsko privrednih organi-Vyscot, M. 1958: Pesteni dubu. Praha. zacija, Zagreb. Roth, V. 1999: Some characteristics of peduncled oak (Quercus robur L.) seed from different seed SUMMARY: Investigations were carried out on three samples of Peduncled oak (Quercus robur L.) and three samples of Sessile-flowered oak (Quercus petraea Liebl.), of different plumpness (Table 1). Seeding was performed on two locations in November 2003 in the forest nursery of the Division for Nursery Production, Forest Research Institute, Jastrebarsko (45o 40’ N, 15o 39’ E) and in the nursery “Zdenački Gaj” (45o 35’ N, 17o 05’ E), Forestry Office of “Grubišno polje”. At the end of the first vegetation (15th October, 2004) measurement of heights of the investigated samples was performed. At the end of the second vegetation (Autumn 2005) measurements of the heights were performed, and on an average sample determination was also made of the mass of dry matter in the above ground part of the investigated Peduncled oak and Sessile-flowered samples (2+0). Influence of the acorn plumpness on the height of one-year plants (1+0) and two-year plants (2+0) of Peduncled oak and Sessile-flowered oak, was evident on both localities in the nursery part of the test (Tables 1 & 2, 6 & 7, Graphs 3 & 4). Bigger acorns of pedunculate and sessile oak produce one- and two-year old seedlings of significantly greater height. The quantity (mass) of the dry matter in the above ground part of the investigated samples of Peduncled oak and Sessile-flowered oak, at the age of 2+0, also showed marked differences, conditioned by the plumpness of acorn (Table 8, Graphs 5 & 6). According to the acorn size, biomass of dry matter of above-ground parts of seedlings of pedunculate and sessile oak at age of two years can be two to five times greater. Increased ability of sorption in soils with greater clay content is probable cause for lower productivity of soil in “Jastrebarsko” nursery, inspite of its greater content of nutrients (N, P and K). Retention of nutrients on the surface of clay particles makes them inaccessible to the plants, and causes reduced growth of seedlings. Another probable cause of weaker growth of seedlings is the impaired water holding characteristics of soil in “Jastrebarsko” nursery. According to the soil texture, heavier soil in “Jastrebarsko” has a lower aeration in the rooting zone, which together with prolongation of reduction condi |