Investigate of the competitiveeffects of Karacadağ local rice variety and Osmancık-97 rice cultivar to some weeds

In the first part of the research, it was investigated the effects of weed seeds, that collected from rice fields, on germination of rice seeds (Physalis peruviana, Amaranthus retroflexus, Echinochloa crus-galli, Potamogeton pectinatus, Panicum miliaceum Cyperus difformis ve Echinochloa oryzoides). Therefore, effects of aqueous extracts of leaves, straw, hull and seed of 7 different weed species was searched on germination Karacadağ and Osmancık-97 rice seeds. In the second part of the research, Karacadağ and Osmancık rice seeds were sown together with 7 different weed seeds to plots. In this research, it was determined effects of varied weed species on germination, root and seedling, tillering, leaving and grain yield of rice cultivars. As a result of the findings; aqueous extracts of Echinochloa crus-galli, E. oryzoides, Amaranthus retroflexus and Physalis peruviana were evaluated as the most prevent weeds the germinations of Karacadağ and Osmancık-97 rices in both laboratory and field conditions. Seedling and root length decreased clearly in both Karacadağ and Osmancık-97 rice cultivars in plots mixed sown with Echinochloa crus-galli. While both Karacadağ and Osmancık-97 rice cultivars could generate the dry matter and be able to compete with Potamogeton pectinatus weeds in point of root and seedling weight, İt was observed that root and seedling weights of Karacadağ rice cultivar remained below the average clearly in plots of mixed sown with Echinochloa crus-galli and E. oryzoides. Panicum miliaceum, Cyperus difformis and Echinochloa crus-galli weeds pressured root and seedling developing of Osmancık-97 rice cultivar. While rice cultivars could be able to compete with Amaranthus retroflexus weeds for tillering potential highly, the number of tiller of rice cultivars was observed to decrease in plots of mixed sown with Echinochloa crus-galli and E. oryzoides. Karacadağ rice has got larger leaf area according to Osmancık-97 rice, and E. Oryzoides was observed to decrease significantly leaf area index of Karacadağ rice. The highest leaf area index of Osmancık-97 rice was found in plots of mixed sown with Potamogeton pectinatus and Amaranthus retroflexus. Cyperus difformis, Panicum miliaceum and E. Oryzoides weeds reduced significantly leaf area index of Osmancık-97. İt was observed that E. Oryzoides and Echinochloa crus-galli reduced significantly grain yield per panicle of rice cultivars Keywords: Rice, Karacadağ local rice, Osmancık-97 breeding cultivars, Competition