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Sebahattin Albayrak Özgür Töngel İlknur Ayan Zeki Acar 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(2):154-161
Abstract This three-year study (2003–2005) aimed to improve the yield and quality of pastures growing naturally that are colonized by naturally occurring vegetation without agricultural input under hazelnut (Corylus sp.) orchards in the middle and eastern Black Sea regions of Turkey. There were eight treatments: 1) control; 2) fertilizer only (triple superphosphate 44% and calcium ammonium nitrate 26%) (80kg ha?1 P and 60 kg ha?1 N in Samsun; 100 kg ha?1 P and 80 kg ha?1 N in Ordu; 100 kg ha?1 P and 40 kg ha?1 N in Giresun); 3) lime only (calcium carbonate 94%) (3.0 t ha?1 lime in Samsun; 4.5 t ha?1 lime in Ordu and Giresun); 4) early cut only; 5) soil aeration only; 6) fertilizer+lime; 7) fertilizer+lime+early cut; 8) fertilizer+lime+soil aeration, laid out in a randomized complete block design with four replicates at each location. The highest dry matter (DM) yield of kg ha?1 and crude protein content (%) was obtained from the treatments that included fertilizer. There was no difference in DM production between any of the combination treatments that involved fertilizer and the fertilizer alone treatment. Only lime and aeration applications also increased yield compared to control, but not as much as did any treatment including fertilizer. Crude protein content of the pasture ranged from 13.3 to 18.1% across locations. Nitrogen and phosphorus fertilizer are recommended to improve DM yields and herbage quality for pastures under hazelnut orchards. 相似文献
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Polley Shamik De Sachinandan Brahma Biswajit Mukherjee Ayan P.V. Vinesh Batabyal Subhasis Arora Jaspreet Singh Pan Subhransu Samanta Ashis Kumar Datta Tirtha Kumar Goswami Surender Lal 《Tropical animal health and production》2010,42(5):985-993
Tropical Animal Health and Production - Mutation studies in different prolific sheep breeds have shown that the transforming growth factor beta super family ligands viz. the growth differentiation... 相似文献
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Abhijit Majumdar Anindya Ghosh Shib Sankar Saha Ayan Roy Subir Barman Dhrubajyoti Panigrahi Anjan Biswas 《Fibers and Polymers》2008,9(2):240-245
Aesthetic properties of fabrics have been considered as the most important fabric attribute for years. However, recently there
has been a paradigm shift in the domain of textile material applications and consequently more emphasis is now being given
on the mechanical and functional properties of fabrics rather than its aesthetic appeal. Moreover, in certain woven fabrics
used for technical applications, strength is a decisive quality parameter. In this work, tensile strength of plain woven fabrics
has been predicted by using two empirical modelling methods namely artificial neural network (ANN) and linear regression.
Warp yarn strength, warp yarn elongation, ends per inch (EPI), picks per inch (PPI) and weft count (Ne) were used as input
parameters. Both the models were able to predict the fabric strength with reasonably good precision although ANN model demonstrated
higher prediction accuracy and generalization ability than the regression model. The warp yarn strength and EPI were found
to be the two most significant factors influencing fabric strength in warp direction. 相似文献
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Observations were made on six grafts for each of 25 clones in three Scots pine (Pinus sylvestris) seed orchards in Turkey. The characters studied were number of female and male strobili, height below and above the longest
branch, total height; diameter at base and breast height, crown diameter, and number of branches. Variation, broad-sense heritability
(H
2) and correlations between characters were estimated.
Variation among clones was lower than among grafts within clone for all characters. The genetic variation for number of strobili
varied between 0 and 17% of total variation, while that for growth characters values varied between 2 and 13%. The number
of female strobili appeared more variable among trees than the number of male strobili. H
2 was not consistently high for any character or seed orchard. The number of strobili increased with the size of the tree,
but not dramatically. Correlations between measures of tree size (both on clone level and individual graft level) and the
number of strobili were in the magnitude r ≈ 0.3. Diameter at breast height seems a reasonable predictor for number of strobili. 相似文献
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Ayan Srivastava Usha Kumari Ashwini Kumar Nigam Swati Mittal Ajay Kumar Mittal 《Fish physiology and biochemistry》2018,44(2):629-637
In Labeo rohita exposed to sub-lethal concentrations of an azo dye, Eriochrome black T for 4 days, gills show considerable alterations in the activity of certain metabolic enzymes—alkaline phosphatase, acid phosphatase, carboxylesterase, lactate dehydrogenase, and succinate dehydrogenase; and antioxidant enzymes—catalase and peroxidase. The activities of alkaline phosphatase, acid phosphatase, carboxylesterase, succinate dehydrogenase, catalase, and peroxidase decline significantly. This has been associated with impaired metabolic function of the gills due to azo dye toxicity. The activity of lactate dehydrogenase, in contrast, shows a gradual increase, reflecting a shift from aerobic to anaerobic metabolism. In the fish kept for recovery for 8 days, after exposing the fish to the dye for 4 days, activity of succinate dehydrogenase, alkaline phosphatase, and lactate dehydrogenase gradually become similar to control. Nevertheless, activity of acid phosphatase, catalase, peroxidase, and carboxylesterase, although recover gradually, remained significantly low as compared to that of control. This study signifies that the dye is highly toxic to Labeo rohita and suggests that the activity of metabolic and antioxidant enzymes can be used as biomarker for fish toxicity. 相似文献
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Ayan Srivastava Arup Mistri Swati Mittal Ajay Kumar Mittal 《Journal of fish diseases》2020,43(8):941-953
This study was carried out to comprehend the pathogenicity of the bacteria in the epidermis of Labeo rohita inoculated with Aeromonas hydrophila. Alterations in the histopathology of the epidermis were examined using scanning electron microscopy, light microscopy and the localization of iNOS and caspase 3 + ve cells by means of immunohistochemical methods. Skin samples obtained from infected fish at different intervals 2, 4, 6, 8 and 10 days showed significant changes in the cellular components of the epidermis. Epithelial cells often appeared hypertrophied with fragmented and loosely arranged microridges, and in the process of exfoliation. Mucous goblet cells increased significantly in density. Club cells showed degenerative changes, often with simultaneous confluence of adjacent cells and release of their contents. Increase in density of iNOS and caspase 3 + ve cells indicates inflammatory response and apoptosis. This study could provide valuable information on the pathogenesis of the disease, and disease outbreaks in farmed fish. Further, it could provide useful guidelines for fish farmers to take preventive measures for the control of the disease. 相似文献
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传统的地下啮齿动物种群数量统计方法如人工捕尽法、土丘计数法等,操作起来费时耗力.无人机航拍技术是一种灵活性强、易操作、可实现地面数据与航拍影像动态分析的技术.本研究基于无人机(unmanned aerial vehicle,UAV)航拍技术,采用不同飞行高度和拍摄面积在呼伦贝尔草甸草原13处具有代表性地点调查东北鼢鼠(Myospalax psilurus)地面土丘密度.对航拍影像进行目视解译提取土丘数量,结合地面人工调查测定土丘数量,分析最佳航拍高度;分析航拍面积与土丘密度之间的关系,明确无人机调查东北鼢鼠地面土丘的最小取样面积.研究结果表明,在呼伦贝尔草甸草原地区,调查东北鼢鼠种群相对数量时,无人机最佳航拍高度为50 m,最小取样面积为2.21 hm2. 相似文献
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