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Öğe Assessment of genetic diversity in Turkish oregano (Origanum onites L.) germplasm by AFLP analysis(Taylor & Francis Ltd, 2006) Ayanoglu, F; Ergül, A; Arslan, MOrigantum onites (L.) is one of the most widely traded culinary herb species in Turkey. Despite limited knowledge on the level of genetic diversity, its use as a source of seed for planting is widespread. To initiate a selective breeding programme, Amplified Fragment Length Polymorphism (AFLP) analysis was used to estimate genetic diversity within the oregano germplasm collection of the Aegean Agricultural Research Institute of the Ministry of Agriculture and Rural Affairs, Turkey. Forty-four Origanum accessions were analysed with ten Eco RI-Mse I primer combinations. In total, 365 unambiguous, selectively amplified polymorphic fragments were detected and 294 polymorphic bands were scored for analysis. Seven main groups were identified by the Unweighted Pair Group Method with Arithmetic Mean (UPGMA) clustering using Jaccard's pairwise similarity coefficient. When this genetic analysis was compared with the sites of collection of the accessions, there was no close genetic similarity among accessions related to their growing region. Relatively low genetic similarity (0.396-0.725%) between accessions indicated that the rate of gene flow between Origanum species was high, as a result of cross-pollination. The results of this study indicate that a broad range of genetic variability exists between accessions of oregano and that future breeding programmes could be improved, based on these data, by selecting materials with maximally different AFLP fingerprints.Öğe The critical period of weed control in double-cropped soybean(Springer, 2006) Arslan, M; Uremis, I; Uludag, ADouble-cropped soybean after winter cereals is the most common soybean production system in the eastern Mediterranean region of Turkey. Weeds are among the main obstacles to double-cropped soybean. A study was conducted in 2002 and 2003 to determine the critical period of weed control (CPWC) for double-cropped soybean. The treatments consisted of either allowing weeds to infest the crop for increasing durations after sowing, or maintaining plots weed-free for increasing durations after sowing. The Gompertz and logistic equations were fitted to relative yields representing the critical weed-free period and the critical time of weed removal, respectively. Johnsongrass (Sorghum halepense), common cocklebur (Xanthium strumarium) and field bindweed (Convolvulus arvensis) were the dominant weeds. For 5% crop loss level, the CPWC was almost all season long, whereas it was from VI to R6-R7 growth stages for 10% yield loss level. These findings indicate that pre-sowing or pre-emergence control methods should be applied in the region to avoid greater crop losses.Öğe Effects of amount and application time of saline water on fibre quallity characteristics of cotton(Inst Chemical Fibres, 2005) Odemis, B; Arslan, MCompared with good quality water the use of saline water increases the amount of water used for crop growth. An increased amount of saline water affects fibre quality. A field study was conducted to determine the effects of amount and application time of saline water on the fibre characteristics of cotton. Irrigation was carried out by a line-source sprinkler which allowed the crop to be irrigated at different levels. All of the fibre characteristics measured were significantly and negatively affected by the saline water applied at VGP and FBF whereas at BO, strength and length were the only fibre characteristics that were significantly and positively affected by the saline water applied Osmotic potential (psi) at different growth stages and mean seasonal osmotic potentials significantly by the second power affected trash, trash area and ginning out-turn, The results showed that the saline water amount the, soil osmotic potential and evapotranspiration (E-T) had a squaring effect on fibre characteristics.Öğe Effects of cultivar maturity on growth and yield of double cropped soybean(Taylor & Francis As, 2006) Arslan, M; Isler, N; Caliskan, SMaintaining yield potential or reducing yield losses is very important for soybean [ Glycine max ( L.) Merr.] double cropping to be profitable. Our objectives were to study the effects of cultivar maturity on yield, yield components and to determine adaptation and yielding potential of 18 soybean cultivars ( six cultivars in each of the maturity groups II, III and IV) in the eastern Mediterranean region of Turkey in 2000 and 2001. The experimental design was randomized complete block with three replications. Effects of maturity group ( MG) on seed yield, yield components, and key phenological stages were significant. Cultivars in MG IV had significantly higher seed yield, plant height, lowest pod height and number of nodes/ plant than cultivars in MG II and III. Among cultivars, the highest seed yield was obtained from KS4895 ( MG IV) with 3.75 t/ha and the lowest was obtained from Dwight ( MG II) with 1.18 t/ha. Except for the number of seeds/pod, all of the measured yield components and key phenological stages were significantly and positively correlated with seed yield. Based on the path analysis of the combined data, it was found that the number of seed/m(2), the period from VE to R1 and from R1 to R7 had greatest positive direct effect on seed yield. The results of the current study showed that cultivars in MG IV were best adapted and best suited for a wheat-soybean double cropping system in the eastern Mediterrenean region of Turkey.
