GAP Agricultural Research Institute

Şanlıurfa, Turkey

GAP Agricultural Research Institute

Şanlıurfa, Turkey
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Yesilnacar M.I.,Harran University | Demir Yetis A.,Bitlis Eren University | Dulgergil C.T.,Krkkale University | Kumral M.,Technical University of Istanbul | And 5 more authors.
Environmental Earth Sciences | Year: 2016

The high-fluoride concentration in groundwater has been yet determined in two villages (Sarım and Karataş) of western Şanlıurfa (Turkey) where it is the only source of drinking water. To assess medical and hydrogeological dimensions of this problem, principally including fluoride concentrations as well as electrical conductivity, temperature and pH values were measured in groundwater wells of 65 villages including these two villages on site and a dental examination was performed on 451 children. The fluoride concentrations in the groundwater of four villages determined as greater than 1.20 mg/L, causing dental fluorosis among children of these villages. Results revealed that dental fluorosis cases can develop even at low fluoride levels. Finally, the prepared geomedical map demonstrated that medical and hydrogeological evidences were compatible with each other. © 2015, Springer-Verlag Berlin Heidelberg.

Aksoy E.,Geophyte Research and Training Center | Arslan Z.F.,GAP Agricultural Research Institute | Tetik O.,Biological Control Research Station | Eymirli S.,Biological Control Research Station
International Journal of Plant Production | Year: 2015

Broomrapes are obligate root parasitic weeds and major constraint to many dicotyledon crops especially in Mediterranean agricultural lands. Due to the fact that no single control measure is able to control broomrapes in the field satisfactorily, integrated management is recommended in general. The use of of trap crops or catch crops is an important strategy for controlling the weeds; and allelopathic plants are also utilized for the control. Trap crops, also called false hosts, are plants which stimulate the germination of the parasite seed but cannot be infested and thus reduce the seed population in the soil. On the other hand, catch crops stimulate the germination of the parasite seeds at a high frequency and allow the development of the parasite. Seed bank of the broomrapes are decreased by destroying the catch crops before the seed creating period of broomrape begins (Sauerborn, 1991). Field trials were conducted using flax (Linum usitatissimum L.) as a trap plant; lentil (Lens culinaris L.) as a catch plant; members of the Brassicaceae species, such as cabbage (Brassica oleracea L.), Brussels sprouts (Brassica oleracea var. gemmifera (DC.) Thell.), broccoli (Brassica oleracea L. var. italica Plenck), cauliflower (Brassica oleracea var. botrytis L.), canola (Brassica napus L.) and turnip (Brassica rapa var. rapa L.) as allelopathic plant in the Adana province (Turkey) in 2007-2009. Flax was the most effective treatment by decreasing 52% and 71% in shoot number and 55% and 26% in dry weight of O. crenata in the first and second year, respectively. Broccoli of the Brassicaceae family, was found to reduce the number of O. crenata shoots by 48% and 39% in two years. Regarding the effect of Brassicaceae family on O. crenata, broccoli was found to reduce the number of O. crenata shoots by 39%. It is concluded that growing flax as a trap plant or lentil as a catch crop two months before the sowing of lentil as a crop is can be a main element of integrated broomrape managament, which cause to reduce the soil seed bank of crenata broomrape. © 2015, Gorgan Univ Agricultural Sciences and Natural Resources. All rights reserved.

Almaca A.,Harran University | Almaca N.D.,GAP Agricultural Research Institute | Soylemez S.,GAP Agricultural Research Institute | Ortas I.,Cukurova University
Journal of Food, Agriculture and Environment | Year: 2013

Mycorrhizae application plays an important role regarding the yield, development and nutrient uptake of pepper plant (Capsicum annuum L.), especially in soils with high phosphorus fixation capacity. The objective of the study was to determine the effect of two mycorrhizal species and three different P doses on pepper growth in an iron oxide and carbonate rich Harran soil. Inan-3363 pepper variety was chosen for the experiment and inoculated with Glomus mosseae and G. etunicatum mycorrhizae species at the seedling and transplanting stages. In the first stage, pepper seeds with about 1000 spores per viol in perlite+peat (1:1, V: V) mixture and without mycorrhizal inoculations were seeded and left to grow. At the second stage the seedlings were transplanted to the experimental plots. In addition to control (0), the plots have received 100 and 200 kg ha-1 P2O5 doses. Both mycorrhizal inoculations had statistically significant positive effect on the pepper yield; however, G. mosseae species caused more pepper yield than G. etunicatum inoculation. Inoculated seedlings resulted in 5.4 and 12.7% yield increase when compared to plots with the 200 kg ha-1 P2O5 doses only. However, yield increases in re-inoculated seedlings (at transplanting stage) were 6 and 20.9% with the 200 kg ha-1 P2O5 dose. The study confirms that the application of mycorrhizae is of great importance to increase the pepper production under field conditions in the region. Plant analyses showed that mycorrhizae inoculation has no statistically significant effect on the amount of plant nutrients.

Aydogdu M.H.,Harran University | Yenigun K.,Harran University | Aydogdu M.,GAP Agricultural Research Institute
Journal of Agricultural Science and Technology | Year: 2015

The purpose of this paper was to determine the factors affecting farmers’ satisfaction from Water Users Associations (WUAs) in the Harran Plain-Turkey. The data used in this study come from a sample of 378 farmers among 23,204 in the Şanlıurfa-Harran Plain. They were chosen via simple random sampling method and interviewed face to face. Sampling was conducted in 52% of the settlements. To analyze the collected survey data, SPSS 15 was used together with Kruskal Wallis, Mann-Whitney, Pearson Chisquare and the correlation tests. The results indicated the existence of relationship between satisfaction and education levels, knowledge level about WUA, and status of ownership, land area, age, farming experiences, income, and service quality given by WUAs. These factors significantly explained satisfaction of farmers. The average of variables’ highest satisfaction was calculated as 47.4%. The highest satisfaction was 68.5% and belonged to the status of ownership; the lowest one was 28.3% in the case of farming experiences. The managers of WUAs should be concentrating on these factors in order to increase satisfaction and provide training and information for farmers. © 2015, Tarbiat Modares University. All rights reserved.

Ozel A.,Harran University | Guler Kosar I.,GAP Agricultural Research Institute | Erden K.,Harran University | Demirel U.,Nigde University
Journal of Essential Oil-Bearing Plants | Year: 2014

This study aimed to determine the optimum seed amount and inter-row spacing in aniseed (Pimpinella anisum L.) cultivation. The study was conducted at the research field of Faculty of Agriculture at Harran University for two seasons (2001 and 2002). The treatments consisted of two row spacing (15 and 30 cm) and four seed amounts (10, 20, 30 and 40 kg ha-1). The following results were obtained from both years: seed yield varied between 958.0 and 1470.0 kg ha-1, essential oil yield varied between 27.5 and 46.4 l ha-1, 1000-seed weight varied between 3.2 and 3.9 g, seed number per umbel varied between 124.8 and 203.6, number of branch per plant varied between 4.3 and 8.2, and number of umbels per plant varied between 5.1 and 12.2. The highest seed yield was obtained from interaction of 15 cm row spacing and 20 kg ha-1 seed amount applications. Overall applications were found to be ineffective on (E)-anethole rates. © 2014 Har Krishan Bhalla & Sons.

Almaca A.,Harran University | Devrim Almaca N.,GAP Agricultural Research Institute | Gulgun Oktem A.,GAP Agricultural Research Institute
Journal of Food, Agriculture and Environment | Year: 2013

It is reported that sulphur deficiency in soils and plants has become widespread. Despite the numerous studies reporting on the effects of sulphur application on growth, yield, yield components and quality parameters in various plant species, very little research has been done in cotton in this respect. Therefore, field experiments were conducted in 2005, 2006 and 2007 to investigate the effects of different sulphur application rates (0, 30, 60, 90 and 120 kg ha-1) on the yield and yield parameters of cotton (Gossypium hirsutum L.) in the Harran plain of Southeastern Turkey. The results demonstrated that sulphur application increased the yield by 3.3-17.1% depending on the rates. The effects of sulphur application on the yield also differed with years. It was established that the increase in yield was due to positive effects of sulphur application on yield parameters. The results indicate that sulphur application could alleviate yield reductions resulting from sulphur deficiency.

Arslan Z.F.,GAP Agricultural Research Institute | Uludag A.,Duzce University | Uludag A.,Canakkale Onsekiz Mart University | Uremis I.,Mustafa Kemal University
EPPO Bulletin | Year: 2015

Turkey is one of the richest areas in the middle latitudes in terms of plant diversity. It has approximately 12 000 plant species and a great number of new species are being added each year. However, invasive alien species have not yet been fully considered in Turkey and only two plant species are in Turkey's quarantine list (Arceuthobium spp. and Eichhornia crassipes). EPPO is an intergovernmental organization responsible for cooperation in plant protection in the European and Mediterranean region and maintains the A1 and A2 Lists of pests recommended for regulation (A1 species are absent from the EPPO region, A2 species are present but of limited distribution), the List of Invasive Alien Plants, the Observation List of invasive alien plants and the Alert List. Eichhornia crassipes, Heracleum persicum, Heracleum sosnowskyi, Ludwigia peploides, Polygonum perfoliatum and Solanum elaeagnifolium are among the species which were recorded in Turkey and are included in the EPPO A2 List. Species recorded in the EPPO List of invasive alien plants which are present in Turkey are: Acroptilon repens, Ailanthus altissima, Ambrosia artemisiifolia (= A. elatior), Carpobrotus edulis, Cortaderia selloana, Cyperus esculentus, Paspalum distichum (= P. paspalodes), Oxalis pes-caprae and Sicyos angulatus. Azolla filiculoides and Rhododendron ponticum are listed in the EPPO Observation List of Invasive alien plants and Miscanthus sinensis, listed in the EPPO Alert List, are also recorded in the Turkish flora. © 2015 OEPP/EPPO.

Uremis I.,Mustafa Kemal University | Uludag A.,Canakkale Onsekiz Mart University | Arslan Z.F.,GAP Agricultural Research Institute | Abaci O.,Directorate of Province
EPPO Bulletin | Year: 2014

Eichhornia crassipes (Mart.) Solms (Pontederiaceae) is reported for the first time for the flora of Turkey. This invasive alien plant was observed in the Asi River (also called the Orontes River), which runs from Lebanon, through Syria to Turkey. The observation was made in the river near the border with Syria. This site is the in the district of Altinözü in the province of Hatay in the East Mediterranean region. Turkey is divided into grids for floral purposes by the book 'Flora of Turkey' and the plants described were collected in grid sector C6. The authors concluded that E. crassipes (water hyacinth) can establish and spread in Turkey. © 2014 OEPP/EPPO.

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