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    Allelopathic Potential of Some Essential Oil Bearing Plant Extracts on Common Lambsquarters (Chenopodium album L.)
    (Revista Chimie Srl, 2016) Isik, Dogan; Mennan, Husrev; Cam, Mustafa; Tursun, Nihat; Arslan, Mehmet
    Allelopathy can be regarded as a component of biological control in which plants are used to reduce development of other plants. Allelopathy refers to the direct or indirect chemical effects of one plant on the germination, growth or development of neighboring plants. The allelopathic effects of extracts of mint (Mentha piperita L.), thyme (Thymus vulgaris L.), rosemary (Rosmarinus officinalis L.), coriander (Coriandrum sativum L.) and sage (Salvia officinalis L.) on seed germination and some growth characteristics of common lambsquarters (Chenopodium album L.) were investigated. Aqueous extracts of aromatic plants at 0,1, 2.5, 5, 10 and 20 % concentrations were applied to determine their inhibition effects on seed germination; seedling shoot and root length of C. album seed under laboratory conditions. The extracts of tested plant species caused inhibitory effects on seed germination and seedling length of C. album. Allolapaticity increased progressively with the increasing extract concentration. The results showed that total germination inhibition of C. album depended on the extract concentration; ranged from %13 to 100. The maximum inhibition (100%) rate for germination was obtained from the highest extract concentration for all test species. Extracts of mint, thyme, rosemary, coriander and sage could be used as alternatives herbicides.
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    The Critical Period for Weed Control (CPWC) in Potato (Solanum tuberosum L.)
    (Univ Agr Sci & Veterinary Med Cluj-Napoca, 2015) Isik, Dogan; Akca, Adem; Kaya Altop, Emine; Tursun, Nihat; Mennan, Husrev
    Accurate assessment of crop-weed control period is an essential part for planning an effective weed management for cropping systems. Field experiments were conducted during the seasonal growing periods of potato in 2012 and 2013 in Kayseri, Turkey to assess critical period for weed control (CPWC) in potato. A four parameter log-logistic model was used CO assist in monitoring and analysing two sets of related, relative crop yield. Data was obtained during the periods of increased weed interference and as a comparison, during weed-free periods. In both years, the relative yield of potato decreased with a longer period of weed-interference whereas increased with increasing length of weed free period. In 2012, the CPWC ranged from 112 to 1014 GDD (Growing Degree Days) which corresponded to 8 to 66 days after crop emergence (DAE) and between 135-958 GDD (10 to 63 DAE) in the following year based on a 5% acceptable yield loss. Weed-free conditions needed to be established as early as the first week after crop emergence and maintained as late as ten weeks after crop emergence to avoid more than 5% yield loss in the potato. The results suggest that CPWC could well assist potato producers to significantly reduce the expense of their weed management programs as well as improving its efficacy.