Turkish Journal of Agriculture and Forestry (TURK J AGRIC FOR )

Publisher: Türkiye Bilimsel ve Teknik Araştırma Kurumu


Turkish Journal of Agriculture and Forestry Sciences is published 6 times a year.

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    Turkish Journal of Agriculture and Forestry website
  • Other titles
    Turkish journal of agriculture and forestry (Online), Turkish journal of agriculture and forestry, Turkish journal of agriculture and forestry, Türk tarım ve ormancılık dergisi
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    Document, Periodical, Internet resource
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    Internet Resource, Computer File, Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: As a result of the increased availability of spatial information in watershed modeling, several easy to use and widely accessible spatial datasets have been developed. Yet, it is not easy to decide which source of data is better and how data from different sources affect model outcomes. In this study, the results of simulating the stream flow and sediment yield from the Seyhan River basin in Turkey using 3 different types of land cover datasets through the soil and water assessment tool (SWAT) model are discussed and compared to the observed data. The 3 land cover datasets used include the coordination of information on the environment dataset (CORINE; CLC2006), the global land cover characterization (GLCC) dataset, and the GlobCover dataset. Streamflow and sediment calibration was done at monthly intervals for the period of 2001-2007 at gauge number 1818 (30 km upstream of the Çatalan dam). The model simulation of monthly streamflow resulted in good Nash-Sutcliffe efficiency (NSE) values of 0.73, 0.71, and 0.68 for the GLCC, GlobCover, and CORINE datasets, respectively, for the calibration period. Furthermore, the model simulated the monthly sediment yield with satisfactory NSE values of 0.48, 0.51, and 0.46 for the GLCC, GlobCover, and CORINE land cover datasets, respectively. The results suggest that the sensitivity of the SWAT model to the land cover datasets with different spatial resolutions and from different time periods was very low in the monthly streamflow and sediment simulations from the Seyhan River basin. The study concluded that these datasets can be used successfully in the prediction of streamflow and sediment yield. Key words: CORINE, GLCC, GlobCover, sediment, Seyhan River, SWAT
    Turkish Journal of Agriculture and Forestry 05/2014; 38(4):515-530.
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    ABSTRACT: The distribution of mating types of Ascochyta rabiei (teleomorph: Didymella rabiei) was studied on isolates collected from chickpea growing areas of Central Anatolia. Mating type assessments of 45 isolates from 6 different provinces were conducted under laboratory conditions. After keeping for 5-6 weeks, the pseudothecial development and ascospore production were observed on chickpea stem pieces that were incubated in 8 ± 1 °C and 85% relative humidity. Both mating types were found in all the provinces, except for Kayseri and Sivas. The majority of the isolates belonged to Mat 1-1 (57.8%) and the others (42.2%) to MAT 1-2. Additionally, the mating types of A. rabiei were differentiated from each other using the multiplex PCR method with the primers Com1, Tail 5, and SP21. MAT 1-1 isolates were amplified to approximately a 460 bp fragment and MAT 1-2 isolates to a 700 bp fragment, in accordance with the discrimination of mating type groups with conventional methods.
    Turkish Journal of Agriculture and Forestry 04/2014; 31:41-46.
  • Turkish Journal of Agriculture and Forestry 03/2014; 36:153-165.
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    ABSTRACT: Bioslurry obtained from biogas plants has the potential to reduce the use of expensive chemical fertilizers and increase yields. A field experiment was conducted to investigate the growth response and yield production of okra fertilized with various combinations of bioslurry and nitrogen fertilizer. The experiment was planned according to randomized complete block design with 3 replications. Bioslurry was analyzed for its composition and was applied at the rate of 600 kg ha–1 along with 50%, 75%, and 100% of the recommended dose of N fertilizer for the production of okra. Phosphorus and potassium fertilizers were added according to recommended rates per hectare. Compared to inorganic N alone, the application of bioslurry alongside NPK fertilizers applied at reduced rates significantly increased the okra fruit yield as a consequence of 14%–31% enhanced plant height, 12%–14% additional branches per plant, and 25%– 36% more fruits per plant. Moreover, bioslurry improved root length by 13%–45%, which resulted in an increased N uptake by plants and improved N use efficiency. Our results suggest that the application of bioslurry alongside reduced rates of N fertilizer is a viable strategy for the sustainable production of okra, especially under semiarid climatic conditions.
    Turkish Journal of Agriculture and Forestry 03/2014; 38:311-319.
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    ABSTRACT: The present study was carried out to determine the effects of methyl jasmonate (MeJA) treatments on fruit peel colour parameters, anthocyanin content, ethylene biosynthesis, phenolic content and antioxidant capacity of ‘Breaburn’ apples. Experimental trees were treated with 1120, 2240 or 4480 mg L-1 MeJA at one and two-week intervals between the 105th and 175th days of growth after full bloom. L* and hue decreased linearly with increasing MeJA concentrations in both experimental years. While MeJA treatment did not cause significant changes in chroma, except for final harvest, in 2010, it decreased chroma values significantly on all sampling dates of 2011. Anthocyanin content, internal ethylene concentration, phenolic content and antioxidant capacity increased linearly with increasing MeJA treatments regardless of the application interval. However, MeJA treatments with one-week intervals were found to be as effective as two-week intervals. Although MeJA treatments increased ethylene biosynthesis, it did not cause any softening; on the other hand, fruit firmness increased linearly with increasing MeJA concentrations. The pre-harvest MeJA treatments can be a good management strategy for red peel colour development and fruit firmness preservation in ‘Breaburn’ apples. Although both application regimes of MeJA significantly increased red colour development, the treatments with one-week interval were found to be more effective than two-week intervals with regard to phenolic content and antioxidant capacity
    Turkish Journal of Agriculture and Forestry 03/2014; 38(-):-.
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    ABSTRACT: The dusky cotton bug, Oxycarenus laetus Kirby (Hemiptera: Lygaeidae), is a serious threat to cotton due to early cultivation of Bt cotton. These studies were carried out under laboratory and field conditions to estimate the feeding damage caused by O. laetus to seed weight, seed germination, and lint quality of cotton cultivar Bt-121 at 6 bug densities (0, 5, 10, 15, 20, and 25 adult pairs). The results revealed that seed germination and seed weight decreased, whereas percent reduction in seed germination and seed weight over control increased with increasing bug density. Bug density in the range of 5–25 pairs caused approximately 9.3%–40.7% reduction in seed germination and 7.5%–29.5% reduction in 100-seed weight over control in both laboratory and field trails. The color of lint changed from pure-white to white when bolls were exposed to 10 and 15 pairs of bugs, while it changed to light-yellow and slightly yellow when bolls were exposed to 20 and 25 pairs of bugs, respectively. Bug density had a high negative correlation with percent seed germination and 100-seed weight, while it had a high positive correlation with reduction in seed germination, reduction in 100-seed weight, and lint quality, under both laboratory and field conditions. Bug density explained more than 5% of total variability in seed germination, reduction in seed germination, 100-seed weight, and reduction in 100-seed weight under both laboratory and field conditions; it explained less than 95% (93.2%) of total variability in lint staining under field conditions. These results indicate that reductions in seed weight, seed germination, and lint quality depend upon bug density. Hence, appropriate control measures should be adopted to check consistent increases in the dusky cotton bug population to avoid seed germination and lint quality losses.
    Turkish Journal of Agriculture and Forestry 01/2014; 38(2):198-206.
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    ABSTRACT: A study was conducted to examine the effects of tenon geometry on the bending moment capacity of simple and haunched mortise and tenon joints under the action of both compressive and tensile loads. The effects of tenon width (25, 37.5, and 50 mm), tenon thickness (7.5, 10, and 15 mm), and tenon length (20, 25, and 30 mm) were examined. All of the joints were constructed of Turkish beech (Fagus orientalis Lipsky) and were assembled with a 40% solid-content polyvinyl acetate. Optimum results were obtained with joints constructed with 10-mm-thick tenons that were 37.5 mm wide by 30 mm long. Tenon length was found to have the greatest effect on joint capacity, whereas tenon width was found to have a much smaller effect. Joints constructed with 37.5-mm-wide haunched tenons had essentially the same moment capacity as joints constructed with 37.5-mm simple tenons. Optimum tenon width was 10 mm (1/3 of rail thickness); joints constructed with 10-mm-thick tenons had greater capacity than joints constructed with either 7.5- or 15-mm thick tenons.
    Turkish Journal of Agriculture and Forestry 01/2014;
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    ABSTRACT: Crop losses caused by insects, pests and pathogens remain one of the major problems in sustainable agriculture. Environmental and health concerns on overuse of pesticides, and impacts of climate change on epidemics are immediate pressing issues. In addition, breakdown of plant resistance by pathogen populations brings limitations to the genetic control of diseases. Biologics can be effective in all types of agricultural systems including organic, sustainable and conventional. Beneficial microorganisms including Bacillus and Trichoderma species have been employed as environmentally safe biopesticides. Molecular studies and proteomics on biopesticides revealed the nature of antibiotics, secreted enzymes and inhibitory compounds. This review focuses on the current knowledge regarding biological agents and their metabolites including quorum-sensing molecules and volatile compounds, and how they can be used in pest and disease management programmes.
    Turkish Journal of Agriculture and Forestry 01/2014;