Уточнить поиск
Результаты 1441-1450 из 2,189
Leaching and durability of copper treated Scots pine (Pinus sylvestris L.) wood Полный текст
2015
Meija-Feldmane, A., Latvian State Inst. of Wood Chemistry, Riga (Latvia);Latvia Univ. of Agriculture, Jelgava (Latvia)
Scots pine (Pinus sylvestris L.) is the most common wood species in Latvia. It is classified as not durable, therefore additional protection against microorganisms is needed prior its use outdoors. Presently Cu-containing wood preservatives are commonly used, but the biggest drawback is the poor Cu fixation, therefore raising concerns about the impact on the environment. Three types of specimens were used to carry out the experiments – untreated, Latvian originated Scots pine; Scots pine commercially treated with preservatives that belong to a group of Cu-boron-triazole (CBA) products; and Scots pine, impregnated with micronized-Cu solution using a standard full cell process. In order to make sure that all of the specimens are equal in their components, elemental analysis was performed and content of nitrogen (1.2 – 2.5 g kgE-1), carbon (485.5 g kgE-1), oxygen (456.0 g kgE-1) and hydrogen (55.6 g kgE-1) was determined. The treated specimens were leached according to the European standard EN 84. For micronized-Cu impregnated Scots pine the total Cu content in leachates obtained by atomic absorption spectroscopy was 0.15 mg gE-1 of wood, and 0.06 mg gE-1 of absolute dry matter with CBA preservative impregnated Scots pine wood. Subsequently, according to the European standard EN 113, treated Scots pine blocks were exposed to brown-rot fungus Coniophora puteana and to white-rot fungus Trametes versicolor for 16 weeks. Mass loss for wood treated with micro-Cu was 48.4% (484 g kgE-1) and 1.5% (15 g kgE-1) respectively, but for CBA – 49.5 % (495 g kgE-1) and 1.2% (12 g kgE-1). Both samples proved to be inappropriate for outdoor use (use class 3).
Показать больше [+] Меньше [-]Implementation of management functions: based on the example of non-government organisations in Kaunas district Полный текст
2015
Marcinkeviciute, L., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Zukovskis, J., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)
This article deals with conception and particularity of management process and functions of non-governmental organisations (hereinafter referred to as NGO), as well as peculiarities of management functions of NGO. Empirical research results of implementation of NGO management functions in Kaunas District have been presented, the major advantages and disadvantages of implementation of NGO management functions in Kaunas District have been pointed out. With reference to the data of theoretical analysis and empirical research, the directions towards development of problematic areas of NGO management functions have been indicated and justified, highlighting the elimination of drawbacks to the implementation of management functions.
Показать больше [+] Меньше [-]Geographical tendencies of main produce exports of Latvia 2000-2013 Полный текст
2015
Berjoza, A., University of Latvia, Riga (Latvia) | Paiders, J., University of Latvia, Riga (Latvia)
Recently economic development has been an issue of intense research and discussion in an academic society. Many facets of countries’ economic development were examined, including foreign trade. As a foundation of international cooperation, this indicator is relevant in observing one’s internal development and external ties. In case of Latvia, this topic is heavily influenced by economists, and the geographical perspective is quite underdeveloped. In this research, the economic ties of Latvia were explored through the analysis of its main export groups in sectors of agriculture, forestry and fisheries throughout the first decade of the 21st century. With the aim of establishing clear ties between Latvia and its major export markets, the statistics of foreign trade was analysed using frequency analysis. It can be reported that in general Latvian export markets are closely located and consist of the Baltic Sea Region countries such as Denmark, Germany, Russia and others. Despite the differences in commodity group destinations, it can be clearly stated that a division of trade flow still exists, separating it into two directions - Eastern and Western, where the former allocates the majority of Latvian processed commodities and more sophisticated goods, and the latter consumes raw materials and less transformed materials. This arguably shows a difference in demand in Western and Eastern markets, where the first mostly requires materials for its own industry, while the latter procures them for consumption on the local market, again pointing to a complexity of reforms required for the Latvian economic focus turning towards Western markets.
Показать больше [+] Меньше [-]Role of local action in addressing regional development and social problems in Latvia Полный текст
2015
Krievina, A., Latvian State Inst. of Agrarian Economics, Riga (Latvia) | Leimane, I., Latvian State Inst. of Agrarian Economics, Riga (Latvia) | Melece, L., Latvian State Inst. of Agrarian Economics, Riga (Latvia)
The objective of the paper research is to assess the role of the implementation of the local development strategies (LDS) elaborated by the local action groups (LAGs) in the regional development and addressing social problems in Latvia. The paper examines the role and place of LDS in territorial development planning in Latvia, carries out thematic analysis of the projects implemented under the LDS as well as tries to assess the LEADER approach impact on regional development and addressing of social issues on the local level. The authors use unpublished data on LEADER projects and apply quantitative and qualitative analysis methods. Most of LEADER projects have been implemented to facilitate the development of infrastructure related to recreation and quality leisure time as well as culture and sports. Rural inhabitants have noticed positive changes in their local territory introduced by the LEADER approach. Though, in order to enhance the role of LAGs and LDS in addressing regional development and social problems at local level, it is advisable that the potential interaction of the activities provided by all regional planning documents is observed when determining priorities at regional level (presently the place and role of the LDS has not been formally defined), while implementation of the LDS should pay more attention to long-term effects and even accomplishment of target priorities.
Показать больше [+] Меньше [-]Determination of the importance and performance of factors affecting rural tourism homestead choice in Lithuania Полный текст
2015
Grigaliunaite, V., Lithuanian Univ. of Health Sciences, Kaunas (Lithuania) | Pileliene, L., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania)
rural tourism homestead choice in Lithuania. The aim of the research was to determine the balance between the importance and performance of factors affecting the choice of rural tourism homestead in Lithuania. The questionnaire research was provided in Lithuania in 2014. Tourists’ evaluations regarding five exogenous latent variables: ‘accommodation and catering’, ‘activities in destination’, ‘natural features’, ‘destination aesthetics’, and ‘environmental preservation’, and four endogenous latent variables: ‘destination marketing’, ‘perceived value’, ‘satisfaction’, and ‘loyalty’ were measured. The total effects for the specific endogenous constructs in the structural model (importance) and the average values of the latent variable scores, rescaled to a range of zero and 100 (performance) were measured to compose the importance performance grid. The research results indicate that the most important factors for tourists while choosing a rural tourism homestead in Lithuania are ‘destination marketing’, ‘environmental preservation’, ‘perceived value’ and ‘satisfaction’. Moreover, the highest share of the total investments allocated to satisfy tourists and enhance the level of loyalty should be accrued to the improvement of ‘destination marketing’ and ‘environmental preservation’.
Показать больше [+] Меньше [-]Evaluation of the regional tourism atractiveness Полный текст
2015
Dapkus, R., Aleksandras Stulginskis Univ., Akademija, Kauno reg. (Lithuania) | Dapkute, K., Vilnius University (Lithuania)
The paper covers theoretical analysis of the tourism development in rural regions as well as the public administration role in tourism sector management in order to evaluate, plan and maintain tourism resources in the region. In the paper, there is presented a discussion on some proposed methodologies for the tourism structure and resources evaluation, in order to compare attraction potential of territories for the tourism development (competitiveness between regions). The tourism planning and management process should be proceeded at various levels of public administration institutions in order to avoid negative influence from different branches of the economy, preserve nature, historical and cultural heritage, ingeniously and cost-effectively use EU Structural funds and national budget resources for the tourism infrastructure development in order to prevent unwanted competition between local and regional public administrations, stimulating them to act jointly in order to achieve synergy attracting tourists to visit neighbouring regions. How to achieve mentioned goals the questioning of the tourism development experts has been performed, and some results of it are presented in the paper. Conclusions on the performed research and proposed methodologies as well as some suggestions for the better tourism development management at the regional level have been presented.
Показать больше [+] Меньше [-]Impact of agricultural landholding size on the land fragmentation Полный текст
2015
Sikk, K., Estonian Univ. of Life Sciences, Tartu (Estonia) | Maasikamaee, S., Estonian Univ. of Life Sciences, Tartu (Estonia)
Land fragmentation is a problem in Europe, and Estonia is not an exception in this respect. Parcel size is widespread characteristic to describe the level of fragmentation. The aim of the study is to find out if there is difference of fragmentation among different groups of landholdings by size. In order to characterise land fragmentation, were calculated the Januszewski and Schmook indexes, average parcel size and average distance from the gravity centre of each landholding to its parcels. Results showed a high level of fragmentation of Estonian agricultural landholdings. There is a high variety of fragmentation inside and among the investigated groups. The average value of Januszewski index for all groups is 0.626, and the average value of Schmook index for all groups is 0.462. The average parcel size for all groups is 7.02 hectares and average distance from the gravity centre of each landholding to its parcels for all groups is 1.57 kilometres.
Показать больше [+] Меньше [-]Assessment of perennial ryegrass (Lolium perenne L.) genotypes under Latvia agro-ecological conditions Полный текст
2021
Rancane, S., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Vezis, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Kreismane, D., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Rebane, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Jansons, A., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia)
Within the frame of the Nordic/Baltic public-private partnership ’PPP for pre-breeding in perennial ryegrass’ various activities were performed, including assessment of L. perenne (Lp) genotypes under agro-ecological conditions of Latvia. This article summarizes the data obtained in two harvest years for 19 intermediate tetraploid (4x) Lp genotypes. In order to compare the results obtained in ryegrass with performance of grass interspecies hybrids (Fl), which become especially relevant in the recent years, two varieties, developed in Latvia – Lolium × boucheanum Kunth. ‘Saikava’ and × Festulolium ‘Vizule’ were included in the experiment. Various scores were performed, including evaluation of regrowth, intensity of culm development, sward cover, crown rust (Puccinia coronata) susceptibility, etc. The dry matter yield (DMY) and fodder quality were also determined. It can be concluded that the genotypes showed relatively good results in the first two harvest years. Wintering conditions were favourable. Despite the intensified drought and heat in the 1st ley year, relatively high DMY, which ranged from 9.30 to 12.15 t haE−1, for Lp were harvested in three cuts. In the 2nd ley year, under more favourable humidity conditions, Lp in four cuts provided similar DMY, which ranged from 8.81 to 11.50 t haE−1. If we compare the average DMY of Lp and Fl genotypes, it can be concluded that in the first two harvest years no significant differences were found, the average DMY was 10.30 and 10.64 t haE−1, respectively. No significant differences were found between Lp and Fl in terms of forage quality.
Показать больше [+] Меньше [-]Virulence of Pyrenophora tritici-repentis: a minireview Полный текст
2021
Kaneps, J., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Bankina, B., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia) | Morocko-Bicevska, I., Latvia Univ. of Life Sciences and Technologies, Jelgava (Latvia);Institute of Horticulture, Ceriņi, Krimūna Parish, Dobele Municipality (Latvia)
Pyrenophora tritici-repentis is a major wheat pathogen in all wheat (Triticum spp.) growing areas worldwide. Up to date, eight P. tritici-repentis races have been described based on chlorosis, necrosis, or both symptoms caused on race differential wheat genotypes: ‘Glenlea’, 6B662, 6B365, and ‘Salamouni’. Symptom development on differential genotypes depends on the interaction of the pathogen’s necrotrophic effectors named Ptr ToxA, Ptr ToxB, and Ptr ToxC with host susceptibility genes. Ptr ToxA is encoded by the single copy gene ToxA and induces necrosis on sensitive wheat cultivars. Ptr ToxB causes chlorosis and is encoded by the multicopy gene ToxB. The Ptr ToxC is the non-proteinaceous, polar, low molecular mass molecule that also induces chlorosis, but up to date, the gene encoding this toxin is unknown. Races producing Ptr ToxA are predominant in the global Ptr population. There are several reports about new putative races of P. tritici-repentis that do not conform to the current race system, so further research is required. This study aims to collect and systematise available information about the virulence and races of P. tritici-repentis.
Показать больше [+] Меньше [-]Research for Rural Development 2020. Annual 26th International Scientific Conference Proceedings.Volume 35 (Online resource) Полный текст
2020
Latvia University of Life Sciences and Technologies and Organizing Committee of Annual 26th International Scientific Conference on Research for Rural Development 2020 tried to continues a tradition of bringing together researchers, academic and professionals in Jelgava, from 13 to 15 May, 2020 from all over the world. But, unfortunately, this year the rules were set by the coronavirus disease (COVID-19) pandemic. We did start new tradition from 2020, account from 1st until the 26th conference and totally are 35 volumes. The interdisciplinary papers contributed the most recent scientific knowledge in agricultural sciences, forestry and wood processing, food sciences, veterinary medicine, economics, rural and environmental engineering, water management; information and communication technologies and education. These Proceedings will furnish the scientists of the world with an excellent reference volume. We trust also that this will be an impetus to stimulate further study and research in all these areas.
Показать больше [+] Меньше [-]