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A bioszén anyagában a tápanyagok három jellemző, hasznosulási sebességüket meghatározó formában lehetnek jelen. A hamu frakcióban lévő elemek gyakorlatilag azonnal, a labilis frakcióban lévők a mineralizáció után heteken, hónapokon belül, míg a perzisztens frakcióban lévők csak évszázadok során szabadulnak fel. A frakciók aránya a bioszén előállítási körülményeitől függ, így ezek alapvetően befolyásolják a végtermék tápanyag-szolgáltató képességét.

A foszfor és a kálium mindhárom frakcióban megtalálható, így a bioszén ezen elemek közvetlen forrása lehet a talajban. A nitrogén viszont csak a labilis és a perzisztens frakcióban található meg — koncentrációja a hamuban gyakorlatilag nullának tekinthető –, így a bioszén saját N-tartalmából növénytáplálási szempontból csak a labilis frakcióban lévő vehető számításba rövidtávon. Ezt figyelembe véve a bioszén alkalmazása mellett a nitrogén más forrásból történő pótlása szüksé-ges.

A bioszén azonban nem csak közvetlenül, saját tápelem-tartalma folytán, hanem közvetetten a talajtulajdonságokra (pH, kationcsere-kapacitás, vízgazdálkodás, stb.) és a mikrobiológiai folyamatokra gyakorolt hatása révén is befolyásolja a talaj táp-anyag-szolgáltató képességét. A közvetlen és közvetett hatás a tápanyagok felvehe-tősége szempontjából gyakran ellentétes irányú. A bioszénnel bevitt elemtartalom révén a talajban mért összes mennyiség megnőhet, de a fokozottabb tápelem-megkötő képesség miatt a könnyen felvehető, vízoldható mennyiségek lecsökken-hetnek. A két hatás eredője határozza meg, hogy egy adott elem felvehetősége javul-e a talajban.

Hosszú távon azonban csakis a közvetett hatásokkal számolhatunk, így a bioszén alkalmazásánál ezeket szem előtt tartva kell mérlegelni és dönteni a felhasználásáról.

A bioszén olyan mértékű alkalmazása, hogy az a Föld klímája szempontjából befolyásoló tényezőként jelentkezzen, egyelőre meglehetősen távolinak tűnik. A talajjavítási, tápanyag-utánpótlási szerepkörben azonban érdemes a bioszénnel foglalkozni. Az intenzív növénytermesztés során a bioszénnel történő tápanyag-utánpótlás nem biztosítható, de a konvencionális trágyaszerekkel együtt alkalmazva hasznos adalékanyag lehet, mivel azok hatékonyságának fokozása mellett talajjavító hatása is érvényesülni tud. A bioszén ezáltal a mezőgazdasági termelésben hosszú távú előnyöket biztosíthat.

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