Halis Arioglu

Genotype × environment interaction and stability analysis of sweetpotato (Ipomoea batatas) genotypes

Abstract 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 × 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.

Characterization of peanut (Arachis hypogaea L.) seed oil and fatty acids composition under different growing season under mediterranean environment

Peanut is one of the most important oil and protein producing crops in the world. Quality of peanut seed oil is influenced by temperature and moisture. However, little is known about the chemical composition of peanut grown in environmental conditions of Turkey. Therefore, this study was conducted at the Cukurova University Farm, Turkey as a main and double cropped to determinate oil quality and fatty acid compositions of some peanut varieties in different growing seasons. The results of study indicated that, the oil content (two years average) of peanut varieties ranged from 47.55-51.55% in main cropped and 43.71-50.48% in double cropped growing seasons. Further, the oleic acid content was also varied between 39.80-81.13% and 39.42-81.51% in main and double cropped growing seasons, respectively and the linoleic acid percentage values of peanut varieties ranged from 1.73 to 36.38% in main cropped and from 2.66 to 37.72% in double cropped growing season. Oleic acid to linoleic acid ratio (O/L) was higher in main cropped than in double cropped growing season and iodine value was higher in double cropped than in main cropped growing season. Leyla Gulluoglu 1 , Halil Bakal 2 , Bihter Onat 3 , Ayman EL Sabagh 4 and Halis Arioglu 2,*

A comparative study of 'fatty acid extraction methods' of sesame (Sesamum indicum L.) varieties grown under Mediterranean environment.

Present study was carried out to determine the effects of two oil extraction methods on the composition of oil fatty acid in sesame of some Turkish genotypes.Two oil extraction techniques viz.Cold pressing (CP) and Soxhlet extraction (SE), were compared for the fatty acid composition of 25 Turkish sesame genotype. Higher averaged sesame seed oil yield (54.7%) was obtained in the SE method than the CP method (31.1%). The oil compositions of sesame genotypes were compared and the presence of five main dominated sesame fatty acid components namely palmitic, stearic, arachidic, oleic and linoleic acid was reported. Among these five fatty acid, palmitic (9.38-10.56%) and stearic acids (4.73-5.12%) were reported predominant saturated fatty acids while arachidic acid was reported in minimum concentration in sesame oil ranging of 0.52 to 0.59 %. Oleic and linoleic acids are the major fatty acids of sesame oil and are reported in large amounts in the oils of all genotypes.The percentage of oleic acid ranged from 37.15 to 41.67, while this percentage was reported between 42.22 to 45.54 for Linoleic acid. From the results of this study, it can be concluded that the fatty acid profile of the sesame oil was not significantly influenced by oil extraction method. C. Kurt 1,* , H. Arioglu 1 , T. Erdem 2 , M.R. Akkaya 3 , A. El Sabagh 4 and M.S. Islam 5

THE EFFECT OF TWIN ROW PLANTING PATTERN AND PLANT POPULATION ON YIELD AND YIELD COMPONENTS OF PEANUT (Arachis hypogaea L.) AT MAIN CROP PLANTING IN CUKUROVA REGION OF TURKEY

This study was conducted at the Cukurova University research farm as a main crop in 2013 and 2014 in Adana, Turkey. The objective of this study was to determine the effect of twin row planting pattern and plant densities on yield and yield components of peanut. The experimental design was a Randomized Complete Block Design with three replications. The Halisbey (Virginia type) variety was used as a plant material in this research. The planting pattern was used as twin-row and conventional single-row. The row spacing was 70 x 25 x 70 cm, 75 x 25 x 75 cm and 80 x 25 x 80 cm for twin-row planting pattern and 70 cm for single-row pattern. Intra-row spacing of 10, 15 and 20 cm was arranged for different plants population. According to a two-year average, the highest pods yield (7833.6 kg ha-1) was obtained from 70 x 25 x 70 x 10 cm (21.05 plants m-1) twin-row planting pattern while the yield was 6688.8 kg ha-1 in single-row planting pattern as 70 x 15 cm (9.43 plants m-1). The yield increase was 17.86% in 70x25x70x10, 16.70% in 75x25x75x10 and 15.79% in 80x25x80x10 twin-row pattern, compared with traditional single-row planting pattern.

THE EFFECTS OF DIFFERENT NITROGEN DOSES ON TUBER YIELD AND SOME AGRONOMICAL TRAITS OF EARLY POTATOES

ABSTRACT This study was conducted to determine the effects of different nitrogen rates on tuber yield and some agronomical traits of early potatoes grown in 2011 and 2012. The field trial was conducted at the experimental field of Cukurova University, in the Randomized Complete Block Designs, with three replications, with Marfona a medium early table potato. Zero, 40, 80, 120, 160, 200, 240, 280, 320 and 360 kg ha -1 pure nitrogen doses were applied. According to the mean values of two years, the total tuber yield was 24.0 ton ha -1 in the control plot. The highest yield per hectare (53.31 ton ha -1 ) was obtained from the 240 kg ha -1 N applied plots. Beyond 240 kg ha -1 peak, as the dose was increased, the tuber yield was decreased. In addition, the marketable tuber yield ratio was 95.60 % with 0 N dose. When the N dose increased to 200 kg ha -1 , the marketable tuber yield has also increased up to 97.41. After 200 kg ha -1 dose, the marketable tuber yield has started to decrease. Keywords: Early potato production, Nitrogen fertilizer, Potato, Tuber yield