Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Sabri ERBAŞ, Ruziye KARAMAN, Hasan BAYDAR, Arif ŞANLI
The present study carried out at Suleyman Demirel University, Faculty of Agriculture of the Department of Field Cropsin 2010. The aim of the study was to examine allelopathic effects of oregano oil (Origanum onites L.) on germinationand seedling development of amaranth (Amaranthus retroflexus L.), dock (Rumex crispus L.) and mustard (Sinapisarvensis L.) and crop plants [wheat (Triticum aestivum cv Gün 91), sunflower (Helianthus annuus cv. Sirena) andchickpea (Cicer arietinum)]. Seeds of these plants were germinated in petri and pot. Oregano oil doses for petri studywas 0 (control), 3, 6, 10 and 20 μl, for pot study was 0 (control), 0.5, 1.0, 2.0 and 4.0 mg kg-1. The germination rate,root length, seedling length and dry matter in each germination condition were investigated. All parameters weresignificant (p<0.01). The germination rate of seeds in petri and pot at control application was determined as 16.0 and46.7% for amaranth, 53.3 and 74.0% for dock, 56.0 and 72.0% for mustard, 89.3 and 92.0% for sunflower, 100.0 and100.0% chickpea, 100.0 and 100.0% for wheat, respectively. The lowest oregano oil doses (3 μl and 0.5 mg kg-1) inpetri and pot study reduced, germination rate of dock, amaranth and mustard dramatically, germination rate of otherplants did not change. The increased doses of oregano oil in petri and pot study negatively affected the root length ofdock, amaranth and mustard. The seedling length of amaranth, mustard and dock at 0.5 mg kg-1 dose was decreasedcompared to control. As a result, it was determined that oregano oil (3 μl and 0.5 mg kg-1) at low doses significantlyinhibited weed seed germination and was less damaging to crop plants seed germination.
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allelopathy
