Tõnu Oga kirjutas:
Rocca-al-mares müüdav JBL pinnaseväetis on samuti mingi savi. Kuigi vaevalt et ta just vermikuliit on (otsustades internetis leiduvate vermikuliidi piltide järgi).
Kõik mis ma sellest tean, riputasin siia:
http://www.hot.ee/vanavares/akvaarium/pinnas_jbl/Kirjutad seal et " Vees muutub pehmeks ja laguneb pikkamööda laiali nagu savi (ilmselt see ta ongi).".
Ma kahjuks ei tea kuigi palju savi "hingeeelust", kuid usun et see vermikuliidile siiski ei sarnane - tegu on vingelt vettimava materjaliga millel lisaks mitmeid huvitavaid eriomadusi.
http://www.aquarticles.com/articles/pla ... ation.html räägib:
Vermiculite is a commonly used inorganic media component which is mined in the U.S. and Africa. This mineral, comprised of an aluminum/iron/magnesium/silicate mixture, is excavated as a material composed of thin layers. Processing includes heating the vermiculite to temperatures upwards of 1000 degrees C, which converts water trapped between the layers of the material into steam. The production of steam results in a pressure that expands the material, increasing the volume of the pieces 15 to 20 times their original size.
Vermiculite is sterile because of these high heating temperatures used during processing. Vermiculite is characterized by a high water-holding capacity as a result of its large surface area: volume ratio, a low bulk density, nearly neutral pH, and a high cation exchange capacity attributed to its structure. Because it compacts readily when combined with heavier materials, vermiculite is sometimes recommended more for propagating material than container media.
Vermiculite gradually releases nutrients for plant absorption; on average it contains 5-8% available potassium and 9-12% magnesium. This inorganic media component can adsorb phosphate - some of which remains in an available form for plant uptake - but cannot adsorb nitrate, chloride, or sulfate. Vermiculite can fix ammonium into a form that is not readily available for plant absorption. This fixed nitrogen is gradually transformed to nitrate by micro-organisms, making it available for plant uptake.
Vermiculite is manufactured in four different grades, differentiated by particle size. Insulation grade vermiculite and that which is marketed for poultry litter (which has not been treated with water repellents) has been used with some success. Vermiculite which has been treated with water repellent, such as block fill should not be used as growing media. Because vermiculite tends to compact over time, it should be incorporated with other materials such as peat or perlite to maintain sufficient porosity. It should not be used in conjunction with sand or as the sole media component, because as the internal structure of vermiculite deteriorates, air porosity and drainage decreases (Landis, 1990).
Siit on lihtne teha oletusi et ehitusmaterjalina müüdav vermikuliit ilmselt akvaariumis kasutamiseks ei sobi kuna võib olla repellentidega (mingite vetttõrjuvate vahenditega) töödeldud.
Substrates for Aquarium Plants
http://home.infinet.net/teban/substrat.htmVermiculite - "VERMICULITE and the SMECTITES are called expanding clays
since water and cations are allowed to move between the layers, forcing
them apart. This creates an internal surface area which exceeds the
external and gives them their large pH-independent CEC's. ILLITE,
CHLORITE, and KAOLINITE do not expand in this way, resulting in lower
CEC's. Approximately half of vermiculite CEC is pH-dependent. Vermiculite
and the smectites can hold NH4+ (ammonium) in both exchangeable and fixed
(unavailable for plants) positions. (See Brady for fixation details.)
There is a reversible equilibrium between the amounts of ammonium held in
these two states (although equilibrium shifts happen much more slowly than
ion exchange), so that an addition of ammonium to the solution will
quickly change the percentage of the CEC occupied by ammonium, some of
which will slowly take up fixed positions. Similarly, if plants take in
NH4+ from exchange sites, more will be released from fixed positions
(slowly) and become available to plants. Thus, NH4+ fixation can be viewed
as a storehouse of N which helps to buffer changes." - JK
It should be noted that CEC is determined by ratio with mass. Expanded
vermiculite has a very low density and so it's contribution to the cation
exchange capacity of a volume of substrate will be much less. The fine
particles of vermiculite tend to float around in the tank for a while and
settle upon the leaves of plants when the substrate is disturbed. It has
attracted a great deal of interest and speculation; however,, its
usefulness remains to be proven conclusively.
Vermiculite is readily and cheaply available at almost all gardening
supply outlets in North America, Europe and Australia. It is also
available in many other places but may be more difficult to locate or
identify. Before addition to an aquarium substrate, it should be soaked in
water for several days or weeks to allow the water to saturate between its
layers so that it will sink. It should be stirred and kneaded to help
break apart the particles. When it has been processed into a fine texture
and sinks, it is ready to be mixed with other substrate materials.
Mõnel pool on asja müüa sellistes kotikestes:
http://amos.catalogcity.com/cc.class/cc ... 95&ccsyn=1Mõned lingid veel:
http://fins.actwin.com/aquatic-plants/m ... 00074.htmlhttp://fins.actwin.com/aquatic-plants/m ... 00079.htmlPisut seotud huvitav jutuke jäi ühtlasi silma perliidi edukast
kasutamisest filtrites:
http://www.schundler.com/aquariumfilters.htm