This study was conducted at the experimental area of the Department of Field Crops, Faculty of Agriculture, Cukurova University as a main crop in 2013 and 2014. The objective of this study was to determinate the effect of harvesting dates on yield and some agronomic traits, seed and oil quality of peanut (Arachis hypogea L.) grown in the Mediterranean region. The experimental design was a Randomized Complete Block Design with three replications. The Halisbey peanut variety (Virginia market type) was used as a plant material in this research. Pod yield per hectare, shelling percentage, 100-seed weight, protein and oil percentage, fatty acids (palmitic, stearic, oleic and linoleic acids) composition and oil quality (oleic acid to linoleic acid ratio, iodine value) traits were investigated. According to a two-year average, the highest pod weight (84.24 g plant -1 ) and pod number (36.83 no. plant -1 ) per plant was obtained when the plants were harvested at 180 days after planting (DAP). The shelling percentage and 100-seed weight increased when the harvesting was delayed. The highest pod (8002.6 kg ha -1 ) was obtained when the plants were harvested at 180 DAP. The oil and protein percentage ranged from 48.66-49.66% and 24.65-25.89% respectively. The oleic and linoleic acid content varied between 51.54-54.94% and 24.65-26.78%, respectively. Oleic acid to linoleic acid ratio (O/L) increased when the harvesting time was delayed.

This study was conducted at the Cukurova University research farm as a double crop in 2013 and 2014 in Adana, Turkey. The objective of this study was to determine the effect of row distance and plant density on yield and yield components of peanut(Arachis hypogaea L.) grown as a double crop. The experimental design was a split plot design with three replications. The Halisbey (Virginia type) variety was used as a plant material in this research. The row spacing was arranged 70 and 75 cm, and intra-row spacing of 5,10,15,20 and 25 cm was arranged for different plants population. According to a two-year average, the highest pods weight (97.57g plant -1 and 94.83 g plant -1 ) and pod number (96.4 pods plant -1 and 93.5 pods plant -1 ) per plant was obtained from 70 x 25 cm and 75 x 25 cm planting density, respectively. Pod number and pod weight per plant was increased when the plant density was decreased. Pod yield per hectare was increased when the plant density was increased. The highest pod yield (7511.9 kg ha -1 ) was obtained from 75x10 cm and the lowest (5171 kg ha -1 ) from 75x25 planting density according to a two-year average. As a result; optimum planting density was found 75x10 cm for Virginia market type varieties in double crop peanut production.

This study was conducted at the experimental area of the Department of Field Crops, Faculty of Agriculture, Cukurova University as a main crop in 2015 and 2016. The objective of this study was to determinate the effect of harvesting dates on some agronomic and quality characteristics of peanut (Arachis hypogaea L.) varieties grown as a main crop in Mediterranean region (Turkey). The experimental design was a split plot with three replications.

This study was conducted at the University of Cukurova, Faculty of Agriculture in 2013 and 2014 as a main and double crop growing season. The objective of this study was to compare of agronomic and quality characteristics of some peanut (Arachis hypogaea L.) varieties grown as a main and double crop. The experimental design was a Randomized Complete Block (RCBD) with three replications. The Halisbey, Sultan, Osmaniye-2005, Arioglu-2003, Batem-5025, NC-7, Flower-22, Flower-32, Flower-36, Brantley, Wilson (Virginia market type), Florispan (Spanish market type), Georgia Green (Runner market type) and Spantex (Valencia market type) varieties were used as a plant material in this research. Pod number and pod weight per plant, 100 seed weight, shelling percentage, oil and protein content, pod and kernel yield per hectare values of varieties were compared. The average pod number, pod weight per plant, fancy pod percentage, protein and oil percentage, pod and kernel yield values of peanut varieties were higher in main crop than in double crop, whereas 100 seed weight and shelling percentage were higher in double crop than in main crop growing season. According to a two-year average, the pod yield per hectare of peanut varieties varied between 3366-8796 kg ha -1 and 3621-7094 kg ha -1 main and double crop growing season, respectively. The average pod yield of peanut varieties were 6177 kg ha -1 in main cropped, it was decreased to 5456 kg ha -1 in double crop growing season. The highest pod yield was obtained from Sultan and Osmaniye-2005 varieties in both growing seasons.

KEYWORDS Arachis hypogeal Fatty acid Growing season Iodine value Oleic linoleic acid ABSTRACTPeanut 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.