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    Effects of some plant growth regulators and nutrient complexes on above-ground biomass and seed yield of soybean grown under heat-stressed environment
    (2006) Gulluoglu, Leyla; Arioglu, Halis; Arslan, Mehmet
    A two-year study was conducted to determine the effects of some Plant Growth Regulators (PGRs) and nutrient complexes on biomass weight, seed yield and yield components of both main and double cropped soybean grown under hot and dry conditions. The experimental design was Randomized Complete Block with four replications. Atonik, Biomaster, GA3, Kinetic, Maxicrop, Cytozyme and Megahix were used as plant growth regulators. The soybean cultivar was A3935 (MG III). Application of PGRs had different effects on biomass weight, seed yield and yield components of both main and double cropped soybean. The highest biomass weight (1054.0 g-2) was obtained from Maxicrop and the lowest (891.8 g-2) was obtained from Megahix applied plots in main cropped soybean. Under double crop conditions, however, the highest biomass weight (857.6 g-2) was obtained from Cytozyme and the lowest (780.0 g -2) was obtained from control. Application of PGRs increased the seed yield and yield components of soybean under both main and double cropped conditions. The highest seed yield was obtained from Atonik with 3876 kg ha -1 for main crop soybean and 3447 kg ha-1 for double cropped soybean. The lowest seed yields were obtained from no chemical applied control plots of both main and double cropped soybean with 3386 and 2838 kg ha-1, respectively. Application of Atonik, Cytozyme and Maxicrop could be suggested to alleviate heat stress and increase seed yield of both main and double cropped soybean grown under hot and dry conditions. © 2006 Asian Network for Scientific Information.
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    Effects of some plant growth regulators and nutrient complexes on pod shattering and yield losses of soybean under hot and dry conditions
    (Asian Network for Scientific Information, 2006) Gulluoglu, Leyla; Arioglu, Halis; Arslan, Mehmet
    This study was carried out to determine the effects of four Plant Growth Regulators (PGRs) (Atonik, GA3, Cytozyme Crop Extra and Megahix), two nutrient complexes (Biomaster and Kinetic) and a see weed extract (Maxicrop) on pod-shattering rate and yield loss of both main and double-cropped soybean grown in a prolonged hot and dry condition in 2002 and 2003. The soybean cultivar was A 3935. The experimental design was randomized complete block with four replications. Application of PGRs remarkably lowered the shattering rates and seed yield losses only for main-cropped soybean. The lowest shattering rates and yield losses were obtained from Atonik and Cytozyme applications until 10 days after R8 growth stage for main-cropped soybean. The positive effects of PGRs on shattering rate and yield losses were decreased with the increasing delay of harvest. The results of the current study showed that seed yield losses of main-cropped soybean could be alleviated by the application of Atonik, Megahix and Cytozyme. However application of PGRs was not suggested for double-cropped soybean if the scope was to reduce yield losses caused by pod shattering. © 2006 Asian Network for Scientific Information.
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    Genotype x environment interaction and stability analysis of sweetpotato (Ipomoea batatas) genotypes
    (Taylor & Francis Ltd, 2007) Caliskan, Mehmet Emin; Erturk, Elif; Sogut, Tahsin; Boydak, Erkan; Arioglu, Halis
    Nine introductions of sweetpotato (Ipomoea batatas) of diverse origin and two local genotypes were evaluated for storage root yield and average storage root weight in four locations of Turkey (Diyarbakir and Sanliurfa representing semi-arid environment and Adana and Hatay representing Mediterranean environment) in 2000 and 2001. The genotype x environment (GE) interaction was evaluated for two yield components (mean storage root weight and storage root yield) using the joint regression analysis and the Additive Main Effects and Multiplicative Interaction (AMMI) analysis. Stability of the genotypes over environments was estimated by using different stability parameters. GE interaction was found to be significant for both yield components, and genotype main effect contributed more than environment and GE interaction to total variability. Total storage root yield varied from 6.72 to 112.60 t ha(-1), depending on genotypes and environments. The introduced genotypes produced a higher yield than local genotypes. Our study revealed that sweetpotato has a great adaptability and yield potential in irrigated Mediterranean-type and semi-arid environments, whereas non-traditional production areas such as Adana, Diyarbakir, and Sanliurfa may be more suitable for sweetpotato production than Hatay, the traditional production area, because of the potential for higher yield. The AMMI model appeared to be a better option for evaluating both GE interaction and the stability of sweetpotato genotypes in multilocational trials. The stability parameters tested in this study could not identify high yielding and stable genotypes.
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    Growth, yield, and quality of sweet potato (Ipomoea batatas (L.) lam.) cultivars in the southeastern Anatolian and East Mediterranean Regions of Turkey
    (Tubitak Scientific & Technological Research Council Turkey, 2007) Caliskan, Mehmet Emin; Soeguet, Tahsin; Boydak, Erkan; Ertuerk, Elif; Arioglu, Halis
    The study was carried out to determine the adaptation potential of sweet potato crops to different regions of Turkey. The study included 9 introduced genotypes of diverse origin and 2 local genotypes that were tested in 4 locations (Diyarbakir and Sanliurfa representing the southeastern Anatolia region, and Adana and Hatay representing the Mediterranean region) in 2000 and 2001. Haulm and storage root growth of the cultivars were monitored at monthly intervals. Total and graded storage root yield, and some quality parameters were determined at the final harvest. Although haulm and storage growth varied according to location and year, all cultivars showed rapid growth from the 90th to 120th day after planting (DAP), at all locations. Storage root formation started between the 30th and 60th DAP at all locations. Total storage root yield, according to cultivar, location, and year, varied from 6.72 to 112.60 t ha(-1), and the introduced genotypes produced higher yields than the local genotypes. Cultivars showed significant diversity in quality traits, such as dry matter content, alcohol insoluble solids content, protein content, and total carotenoid content. This study revealed that sweet potato could be adapted to both the Mediterranean and southeastern Anatolia regions of Turkey, and that high yield values could be achieved in these areas.
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    THE RESEARCHES ON SOYBEAN (Glycine max Merr.) VARIETY BREEDING FOR RESISTANCE TO WHITEFLY IN TURKEY
    (Soc Field Crop Sci, 2010) Gulluoglu, Leyla; Kurt, Cemal; Arioglu, Halis; Zaimoglu, Bihter; Aslan, Mehmet
    This study was conducted in the Cukurova University, Faculty of Agriculture, Department of Field Crops in between 1993 and 2003 in Turkey. The objective of this research was to breed high yielding whitefly (Bemesia tabaci Genn.) resistant soybean cultivar. Soybean cultivar S.4240 and Williams was crossed in 1993. Individual plant selection was made according to single-seed descent selection method in the segregating materials. The F-2 seeds were planted and one random F-3 seed (pod) was taken from each F-2 plant. This process was repeated until the plants were considered sufficiently true-breeding F-5 generation. All the F-5 seeds were planted as a second crop and 200 individual plants were selected among the F-5 plants according to breeding objectives at the harvesting time in 1998. The selected seeds plants were planted in separate rows in 1999 and 2000. Nine rows (lines) were selected according to breeding objectives at the end of 2000 growing season. The replicated yield test was repeated in 2001 (with 9 soybean lines), 2002 (with 7 soybean lines) and 2003 (with 7 soybean lines) seasons with selected soybean lines under double cropping conditions. At the end of 2003 growing season, three breeding lines (SW-3, SW-7 and SW-11) were determined as cultivar candidates.