Učinki različnih odmerkov dušika na fitotoksičnost nekaterih alelopatičnih poljščin

Y. NOROUZI, G. R. MOHAMMADI, I. NOSRATTI

Povzetek


Intenzivna raba herbicidov ima lahko resne negativne vplive na okolje. Z zmanjševanjem kalitve in začetne rasti lahko igra alelopatija pomembno vlogo pri zatiranju plevelov. Na učinkovitost alelokemikalij vplivajo številni dejavniki kot so količina hranil v tleh, pH in mikroorganizmi. Na Faculty of Agriculture and Natural Resources of Razi University, Kermanshah, Iran, je bil v letu 2013 izveden lončni poskus na prostem, z namenom ovrednotenja različnih odmerkov N gnojil (0, 150, 300 kg ha-1) na zaviralni učinek lucerne (Medicago sativa L.), navadnega sirka (Sorghum bicolor L.), in navadnega tobaka (Nicotiana tabacum L.). Po dodatku zmletih nadzemnih delov teh poljščin so spremljali vznik in rastne parameter treh plevelov, divjega sirka (Sorghum halepense (L.) Pers.), navadne kostrebe (Echinochloa crus-galli (L.) Beauv.) in navadnega ščira (Amaranthus retroflexus L.). Rezultati so pokazali, da je dodatek navadnega tobaka, navadnega sirka in lucerne znatno zmanšal kalitev in zgodnjo rast testiranih treh plevelov. Testirani pleveli so se različno odzvali na dodatke alelopatskih rastlinskih ostankov. Uporaba dušičnih gnojil je imela značilen učinek na inhibitorni potencial alelopatskih rastlin, vendar niso uspeli ugotoviti konsistentnega trenda med odzivi plevelov na dodatke alelopatskih rastlin in povečanimi odmerki dušičnih gnojil.

Ključne besede


lucerna, navadni sirek, navadni tobak, alelopatija, dušikova gnojila, pleveli

Celotno besedilo:

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Literatura


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DOI: http://dx.doi.org/10.14720/aas.2016.107.1.17

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