Published in Scientific Papers. Series A. Agronomy, Vol. LXIII, Issue 1
Written by Plamen SERAFIMOV, Shteliyana KALINOVA, Irena GOLUBINOVA, Mariyan YANEV, Anyo MITKOV
It has been found that dry biomass of sunflower broomrape (Orobanche cumana Wallr.) has an inhibitory effect on seed germination and the initial development of five tested sunflower varieties. Sunflower broomrape with the highest overall allopathic potential (OAP) can be identified with originating in Tyulenovo and Radnevo with average OAR 0.22. Sunflower broomrape with the lowest overall allopathic potential (OAP) can be identified with originating in the ecological areas of Senokos and Shumen with average OAR 0.10. High allelopathic tolerance was observed in the seed germination and in the initial development of the sunflower varieties San Luka and Diveda. Their index of initial plant development (GI) ranged from 72.9 to 127.0 at higher studied concentrations 16.00% w/v and 32.0% w/v. The lowest allelopathic tolerance was observed in the seed germination and in the initial development of the sunflower variety Enigma. Its index of initial plant development (GI) ranged from 39.4 to 68.5. It has been found an equivalent between the allelopathic effect of dry biomass of Orobanche cumana Wallr. and the allelopathic tolerance of Helianthus annuus L. varieties, according to the common allelopathic potential of Orobanche cumana Wallr. and the Initial Development Index (IDI) of the sunflower plants.
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