Pošlji prispevek (e-pošta) Nekateri rastlinski izvlečki upočasnjujejo nitrifikacijo v tleh
Povzetek
V inkubacijskem poskusu je bil ovrednoten vpliv 17 vodnih rastlinskih izvlečkov na inhibicijo nitrifikacije dušika v urei primerjalno s kemijskim inhibitorjem diciandiamidom (DCD). Uporabljen rastlinski material je bil nabran na različnih območjih province Basrah v južnem delu Iraka. Vodni izvlečki so bili pripravljeni v razmerju 1:10 (rastlinski material:voda) in dodani v koncentracijah 0.05, 0.10 in 0.20 ml g-1 ilovnato-peščenim tlem. DCD je bil dodan tlem v razmerju 50 µg g-1 tal, urea pa v razmerju 1000 µg N g-1 tal. Tretirana tla so bila inkubirana pri 30O C 40 dni. Rezultati so pokazali, da je uporaba rastlinskih izvlečkov upočasnila nitrifikacijo v tleh, razen pri izvlečkih kazaurine, dateljeve palme in evkalipta. Izvlečki kaprovca, škrbinke, trave (Imperata cylindrica (L.) P. Beauv) in granatnega jabolka so se izkazali za bolj učinkovite inhibitorje (51, 42, 40 in 40 % inhibicija) kot DCD (33 %). Največja inhibicija je bila dosežena z uporabo izvlečkov v koncentraciji 0.1 ml g-1 tal, pri inkubaciji 10 dni. Rezultati so tudi pokazali, da se je v tleh obravnavanih s temi izvlečki značilno povečala količina NH4+–N in zmanjšala količina NO3-–N v primerjavi s tlemi, obravnavanimi z DCD in kontrolo. Rezultati te raziskave nakazujejo možnost uporabe izvlečkov preučevanih rastlin kot potencialnih inhibitorjev nitrifikacije v tleh.
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DOI: http://dx.doi.org/10.14720/aas.2014.103.1.01
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