Artikkelit jotka sisältää sanan 'physical properties'
Physical properties of organic soil in Sto owe Mountains National Park (Poland).
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The aim of this work was to determine physical properties of organic soils developed in different sites of the mountain area of Stolowe Mountains National Park, Poland. The profiles with different botanical composition of peat were analysed and classified by types and species of peat. Peat, muck and peat-mud were identified (9 profiles) at chosen locations. Investigation showed that top plateau organic soils were developed on a sandy-loam or sand weathered sandstone base. Organic soils in valleys and slopes were developed on a loamy-silt or clay basement. Peat horizons developed according to different types of sites (mesotrophic and eutrophic, sometimes oligotrophic). Generally, these soils are ombrotrophic, i.e. fed by atmospheric water only. These soils were classified as Fibric Histosols and Terric Histosols. Organic soils within the main regions of the park were over-desiccated, with advancing muck-forming processes being noted.
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Bogacz,
Institute of Soil Science and Agricultural Environment Protection, Agricultural University of Wroc aw 50-357 Wroc aw, ul. Grunwaldzka 53, Poland
Sähköposti:
ei.tietoa@nn.oo
Turvepohjaisten kasvualustojen tiivistyminen yksivuotisessa paakkutaimikasvatuksessa.
English title: Compaction of growth media based on Sphagnum peat during one-year culturing of container seedlings.
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Changes in bulk density and water retention during one-year culturing of container seedlings were studied in pure, low-humified Sphagnum peat and in peat-based two-component growth media. In all growth media, the bulk density increased slightly with time. The corresponding decrease in total porosity was negligible (< 1 %-unit for pure peat). At matric potentials < -1 kPa, water retention of growth media tended to increase somewhat with time. On the other hand, shrinkage at desorption decreased during seedling culturing. The results suggest that, from the standpoint of seedling growth, the structure of growth media based on Sphagnum peat does not markedly change or deteriorate during one-year culturing of seedlings. However, in seedling culturing peat growth media containing hydrogel may possess restricted aeration due to excess water retention, while addition of coarse textured materials, such as perlite, to peat can increase aeration.
Key words: nursery management, soil physical properties, shrinkage, substrate, water retention
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Heiskanen,
The Finnish Forest Research Institute, Suonenjoki Research Station, FIN-77600 Suonenjoki, Finland
Sähköposti:
ei.tietoa@nn.oo
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