Showing 7 results for Yildirim
Volume 3, Issue 3 (9-2017)
Abstract
The present study aimed to determine aphid species in South Eastern regions of Turkey. The material of this study was collected during April to October 2016. As a result of the evaluation of the samples, 110 species and 1 subspecies recorded from study area, of them 9 species and 1 subspecies are determined as new records for Turkey aphid fauna: Aphis (Aphis) cirsiphila Pashtshenko, 1992; Aphis (Aphis) sanguisorbae Schrank, 1801, Aphis (Aphis) wartenbergi (Börner, 1952), Cinara (Cinara) intermedia (Pašek, 1953), Eulachnus cembrae Börner, 1950, Lipaphis (Lipaphis) pseudobrassicae (Davis, 1914), Pseudoregma panicola (Takahashi, 1921), Schizaphis (Euschizaphis) palustris Theobald, 1929, Sitobion (Sitobion) lambersi David, 1956 and Uroleucon (Uromelan) jaceaema crosiphon (Hille Ris Lambers, 1939). With these new records, the number of species and subspecies of aphids in Turkey increased to 541 and 13, respectively.
Volume 16, Issue 7 (Supplementary Issue - 2014)
Abstract
Wood and non-wood resources in the forests have occupied a very important place in human’s life, since the advent of history. And today, developing technology along with increasing needs enhance the importance of the other functions of forests, in parallel with wood production. Both in the world and as well in Turkey, one of the featured functions of forests is the production of Non-WoodForest Products (NWFP). Certain NWFPs are of high added value and are used in many such fields as food, pharmaceutics, and as well in cosmetics. It is emphatically essential to reveal the potential of these products by conducting studies. Vast contributions could be made to a country’s economy by increasing and utilizing these potentials. With this study, it is intended to reveal the existing as well as the future return within a period of six years to the Turkish economy of NWFPs through a utilization of the foreign trade and production data of the gone years.
Volume 19, Issue 3 (5-2017)
Abstract
This study assessed the optimum water need of pepper (Capsicum annuum L. cv. California Wonder) and the critical irrigation level to be applied in order to achieve a reasonable economic yield in water shortage conditions. In a controlled field experiment involving five different treatments, seasonal evapotranspiration for pepper fluctuated from 89 mm in the severe stress treatment (I0.00) to 1,018 mm in the excess water application (I1.25). The highest yield was obtained in the full treatment where water in the root zone was refilled up to field capacity. In cases of water shortage, applying water of 690 mm ensures an economical yield. Maximum leaf area index was recorded in the full treatment (I1.00), which enabled the pepper to receive more benefit from total incoming solar radiation (average, 2,387 MJ m-2). An average of 555.45 MJ m-2 was held by the pepper canopy throughout the whole growing season. Radiation use efficiency values on a dry yield basis were 0.69 g MJ-1 in 2011 and reached 1.07 g MJ-1 in 2012, since the leaf area index increased from 1.46 to 2.44. Therefore, averaged over two years, the peppers in the full treatment converted irrigation water of 888 mm and intercepted photosynthetically active radiation into the highest yield of 75.5 t ha-1, which was more efficient than the excess and deficit water application treatments.
Volume 21, Issue 5 (9-2019)
Abstract
Use of fertilizers is important in agricultural production. In particular, it is more focused on organic fertilizer that increases yield and quality of crops and is not harmful to environment at the same time. In this study, the effect of bacterial biofertilizers on yield and some quality parameters were analyzed in two tomato cultivars (Solanum lycopersicum L., cv. Cevahir F1 and Pala F1) in greenhouse conditions. Three different concentrations (1, 3, and 5 gL-1 and control i.e. un-inoculated) and two different bacterial fertilizers including A: Azotobacter spp. (1×109 CFU), and B: mixture of Bacillus subtilis and Bacillus megatarium (1×109 UFC) were evaluated in a completely randomized design with 3 replications. The treatments were applied one week after planting of the seedlings. The solutions were given to the root zone of the plant and repeated 3 times at intervals of 10 days. Average fruit weight, fruit number per plant, fruit weight per plant, plant height, fruit width and length, total soluble solid, pH, ascorbic acid, chlorophyll content, dry matter yield and mineral content were evaluated on tomato. The effects of treatments were found significant on plant growth parameters. Bacterial fertilization increased yield and other parameters in all treatments. Besides, the effects of treatments were significant on mineral content of tomato fruits.
Volume 21, Issue 5 (9-2019)
Abstract
This study was conducted in field conditions to determine the response of cabbage to four different irrigation levels, from 2015 to 2016. The experiment was laid out in randomized block design. Plots were irrigated using a drip irrigation system and the irrigation interval was fixed as 4 days for all treatments. Evaporation was determined by Class-A pan. Six organic acids (ascorbic, tartaric, lactic, citric, malic and oxalic) were identified and quantified by HPLC-UV. White cabbage yields were significantly increased by water applications, but deficit irrigation produced negative results. Maximum amounts of ascorbic, lactic, tartaric and malic acids were found in the low water content treatment, while reducing sugar and total sugar increased in the full irrigation treatment. In the study, supplying different amounts of irrigation water caused changes in the growth and quality of white cabbage (Brassica oleracea L.cv. Capitata). When water stress in cabbage production exceeded more than 30%, the yield and, especially, the quality of cabbage decreased significantly. The results revealed evidence that different soil moisture content in the root depth affected the yield, organic acids, and sugar content.
Volume 22, Issue 3 (4-2020)
Abstract
Astragalus gymnolobus Fischer (Leguminosae family) is an endemic plant to Turkey. Firstly, an in vitro regeneration system was achieved using leaf and petiole explants on Murashige and Skoog (MS) medium supplemented with different cytokinins [Thidiazuron (TDZ), Kinetin (KIN), Benzyladenine (BA)], auxins [Indole-3-Butyric Acid (IBA), Indole-3-Acetic Acid (IAA), 2,4-Dichlorophenoxyacetic acid (2,4-D) and Naphthalene Acetic Acid (NAA)] and Gibberellic Acid (GA3) at diverse concentrations. Best shoot formation was obtained with leaf explants and only TDZ alone or TDZ and IAA combinations were effective for shoot forming. The best shoot inducing response (17.60 shoots per explant at 23.81% shoot frequency) was recorded at 0.5 mg L-1 TDZ alone. Among the TDZ stand-alone treatments, 0.05 and 0.1 mg L-1 TDZ were also effective in terms of shoot induction frequency (31.82 and 30.43%, respectively). Root formation was obtained after 3 months (3.5 roots per shoot with 77.8% root frequency) only in auxin free MS medium (control) when regenerated shoots were cut off 0.5-1 cm from the base to exclude the callus part. This study also aimed to determine and compare the antibacterial and antioxidant properties and phenolic composition of in vitro-regenerated and field-grown A. gymnolobus. The results revealed that field-grown leaves generally showed higher biological activities and had higher amounts of phenolic compounds. Furthermore, A. gymnolobus leaves were noteworthy sources of rutin. This initial in vitro culture protocol for endemic A. gymnolobus is valuable for genetic resources conservation and can be used in stress application studies to increase the level of phenolic substances in in vitro-grown plants.
Volume 26, Issue 1 (1-2024)
Abstract
This study was conducted on high-elevation rangelands of Erzurum, Turkey, between 2011 and 2014 for four year. The aim was to determine the effects of Plant Growth Promoting Bacteria (PGPBs) applications on rangeland canopy cover ratio. PGPBs strains (Pseudomonas fluorescens T26, Pantoea agglomerans 16B, Paenibacillus polymyxa TV-12E, Bacillus cereus TV-30D, and Bacillus megatherium TV-3D) used in this study were obtained from the culture collection unit in the Department of Plant Protection, Faculty of Agriculture at Atatürk University, Erzurum, Turkey. Four study year results showed that PGPBs treatments had significant effects on the canopy cover of rangelands. The highest canopy cover ratio occupied was in treatment T21 (50 kg N ha-1+25 kg P2O5 ha-1+B. megatherium. TV-3D). There was a significant difference between treatments T21 and the other treatments, while the lowest was in treatment T14 (50 kg N ha-1+B. cereus TV-30D). In plots of P. polymyxa TV-12E, P. fluorescens T26, and B. megatherium TV-3D bacteria strains plus half of N+P fertilizer, the canopy cover was higher than that of the other treatments.