Both forestry theory and practice have proved that amelioration favours the growth of forest stands significantly. The growing stock increases even 10 times, if the amelioration system is well-functioning. Joint Stock Company Latvia State Forests that is managing half of forests in Latvia has started renovation of old amelioration systems aiming to improve the productivity of state owned forests in Latvia. In order to evaluate the impact of the renovation of the old amelioration systems, a tree ring width in 7 pine stands, 5 spruce stands and 3 birch stands was analysed. This study shows that the renovation itself has not affected the productivity of mature pine, spruce and birch significantly 3-4 years after the renovation. Authors have come to a conclusion that the reason for that could be too short observation period or particularities of a stand structure and age.

The number of the most important game animals of artiodactyla species (moose, red deer, roe deer, wild boar) has been increasing in Latvia during the last 10 years. At the same time, the number of hunting districts where the census of these game animals is taken is also increasing, whereas the average area of the districts is diminishing. The studies show that at present the area of many hunting districts is notably smaller than the individual territory inhabited by these species. This particular study aims at establishing whether there is a relationship between the area of a hunting district on which a census is taken and the number of animals counted, as well as whether the number of animals is really increasing or the increase in the number is attributed to an increase in the census unit number. It was established that in respect of the four species there is a significant correlation between the area of the hunting district and the density of animals in the district. The number of moose and red deer may be assessed more objectively in the districts with an area exceeding 5,000 hectares. The census of roe deer and wild boars is notably influenced by the area of the territory where the census is taken, but the analysis does not explicitly show whether the number of roe deer and wild boars is under-assessed in large districts or over-assessed in the small ones.

Three spectrophotometric methods were compared for the assessment of milk fat oxidation: the AOCS (American Oil Chemists' Society) 2-thiobarbituric acid (TBA) value direct method, the TBA method of Aristova, and the modified method for the estimation of total carbonyl compounds in oils of Endo et al. Two cow milk fat samples – a fresh fat, obtained from fresh milk, and a rancid fat, obtained from a rancid commercial butter by means of high-speed centrifugation (15.871 × g, 30 minutes at 40 deg C) – were analyzed several times in a 22-day period after sample preparation. A positive linear correlation between absorbance and storage time was established in all used methods. The method of Aristova is appropriate for exact determination of oxidation products. This method had rather good R2 value (0.85) of the fresh fat sample results; however, the coefficient of variation (45.78%) showed rather large deviations between parallel analyses. The methods of AOCS and Endo et al. can be used for the assessment of the dynamics of fat oxidation by reporting absorbance values from the assay directly. By these methods rather high R2 values (0.86, 0.93) of the fresh fat sample results were obtained; the coefficients of variation also were satisfactory (10.13%, 11.12%). The last two methods are cheaper and require smaller sample amounts (less than 0.2 g), while the method of AOCS is the most time-consuming method.

The pears (Pyrus communis) are one of most popular fruits that consumers willingly use as fresh produce. On the market place, consumer mainly pays attention to per's externals, size, colour, as well as to fruit taste, substantially influenced by degree of readiness, which in its turn has affect on the chemical composition of pears. The physical, chemical and sensory indices are significant when fruits have been used for fresh-cut fruit salad preparation. All tests have been carried out at Latvia State Institute of Fruit Growing, Dobele in year 2009-2010. The objective of this study was to evaluate the physical, chemical and organoleptical properties of winter cultivars of pears grown in Latvia. The object of the research was 13 cultivars of pears: 'Delta', 'Latgale', 'Tayushchaya', 'Talgarskaya', 'BP 8965', 'Elektra', 'Janvarskaya', 'Beta', 'Bere Kiyevskaya', 'Eckehard', 'Belorusskaya Pozdnaya', 'Erika', and 'Conference' and as a control commercial cultivar. The pears were analysed and their parameters were measured: average mass and diameter of fruits, flesh firmness, colour of flesh, titratable acid (TA) and soluble solids content (SSC) were determined. Sensory analyses were carried out by 9-point hedonic line scale method. Soluble solids content (degree Brix) of pear fruits grown in Latvia is within 9.6 - 14.5 degree Brix. The titratable acidity (TA) is insignificant (0.05-0.26%). The average mean mass of one fruit depending on a cultivar, is 174 g, the flesh firmness at the maturity stage is on average 10.7 to 26.5N. The fruits of cultivars 'Tayushchaya', 'Elktra', and 'Bere kiyevskaya' by their sensory indices were evaluated as the best.

Researching new remote sensing and data processing methods is very important subject in forestry. The objectives of research are to explore methods to determine single tree characteristics using LIDAR and adapt them for Latvian forest conditions. Different algorithms and mathematical relations for automatic calculation of tree species, coordinates, height and diameter at breast height are described. Within the project four different clustering methods for tree identification were evaluated. The first method's construction is based on reflection point count in certain height range. The second and third methods are searching for global and local maximums on height axis of LIDAR data collection. In the fourth method segmentation of aerial photography is done by using the user selected sample data. Tree tops were s discovered by searching similarly coloured regions. Field measurements were used for the calibration of LIDAR data and analysis. Sample plots were fitted in the study area with different species composition, age and density. The total number of measured trees in sample plots is 1844. Results show that height can be found mainly for I, II, III craft class trees with average error 2.5%. Stem diameter estimation error of pine is 28%, spruce 17%, birch 4.2% and second storey trees 5.4% using linear equations D = 0.6616*H + 4.6969 (for coniferous trees) and D = 0.7756*H + 3.7132 (for deciduous trees). Dividing trees in classes of coniferous and deciduous can be done by using near infra red photography. The total number of first storey trees identified by LIDAR is 91%, by aerial photographic method 94%.

The urban forest is recognized as a potential to improve the quality of life of urban dwellers and increase the sustainability and ecological stability of the city. However, there is little data on professional attitude to urban naturalistic landscapes. This research studies the attitude of professionals and decision makers to the naturalistic forest landscapes in urban area of Riga city, Latvia, in contrast to more traditional – formal landscape. The survey includes the opinions of territorial planners and environment specialists from Riga municipality and other institutions related to ecological, practical, planning and conservation activities, and private working landscape architects. The statistical analysis and data’s empirical distribution showed that professionals in Riga city recognize the values and benefits of naturalistic forest landscape. However, environmental preferences may depend more on affective reactions than on ecologically-based logical operations.

Latvia is a territorially small country with small open economy, and its main and the most competitive recourses are highly educated society and well developed science which is based on research, innovation and modern technologies. To create a well functioning innovation system as a part of knowledge-based economy, several conditions has to be met to insure that all parts of national innovation system effectively work together. This article is dedicated to analysis of financing mechanisms that can be used by research institutes in the field of agriculture in Latvia to ensure sustainable rural development. The research in the field of agriculture in Latvia is mainly performed by the state research institutes and research agencies of Latvia University of Agriculture. To provide favourable environment for development of research and science, there is set legislation framework and financing mechanisms such as base financing from the state budget, state research programmes, European Commission Framework Programmes, and the European Union (EU) Structural Funds assistance. The analysis has shown that support of EU Structural funds has positive impact on number of applied research carried out in research institutes in the field of agriculture in Latvia. EU Structural funds assistance helps to develop fundamental research activities and innovative approach to the science that is one of the preconditions for the development of states' competitiveness. In conclusion, the authors resume that it is necessary to establish a strong link between higher education institutions, research institutes, and entrepreneurs in the process of building effectively working national innovation system.

Appropriate resources, availability of infrastructure, economic significance and food market forecasts determine the rationale for development of the dairy sector in the Baltic States. The sector is faced by significant economic problems; inter alia, production structure fragmentation, lack of investments and low labour productivity. Several sector's problems can be directly or indirectly solved by integration. Competition legal acts setting strict penalties directly and widely apply to integration processes, imposing a high level of legal risks on integrating parties. Thus, competition legislation forms a central framework limiting and guiding integration. As the subject has not been explored earlier, the author researched the Baltic dairy sector integration options at primary and secondary levels as influenced by the EU and Baltic national competition legislation and its implementation practice. Abstract-logical, monographic and interview methods have been used. The author concludes that law-compliant cross-border integration opportunities for the Baltic dairy sector exist to form larger integrated undertakings with higher market power. Reference to market shares in the competition legislation in countries with lower aggregate crude milk market sales puts the dairy sector participants at a disadvantage in case of integration processes resulting in smaller absolute size of the allowable integrated undertaking. Integration by agreements, decisions and concerted practices is appropriate for national level arrangements but is with limited applicability in the Baltic states cross-border integration at both levels of the dairy sector. In case of concentration, integration may be used to create cross-border integrated structures increasing concentration at every level of the Baltic dairy sector.

The paper deals with the evaluation of resource price preferences and resource utilization efficiency in Latvian dairy sector that shows Latvian relative competitive position both in terms of producing competitive products for the market, as well as ensuring competitive salaries and a general rise in living standard for the employees. The evaluation is carried out through analyzing price levels of the main production resources and the utilization efficiency of these resources, based on the comparison with other EU countries. The efficiency indicators in Latvian primary milk production sector are considerably lower and despite resource price preferences the cost level per production value in Latvia is higher than in other countries. The analyzed resource utilization efficiency is low in Latvia also at the processing industry level, though the current price level of the main production resources helps to ensure competitive positions of Latvian dairy products. But considering large differences in compensation levels for labour force between Latvia and other EU countries, without increase in productivity, the situation is not sustainable in long-term.

Health care has an important role in regional economic and politic development because human life and health is the only criterion and prerequisite for any other value. If for any reason human loses more than 20% of his blood, he is not able to join in economic actions and is under a risk of dying. That is why economic development loses human resources. In case of losing blood, human life can be saved only by donor blood, since synthetic blood replacements have not been discovered yet. In this paper, historical development of blood donor movement as an aspect of economic development has been researched. Experiments, failures and scientific discoveries in blood transmission history have also influenced world economic history. Based on historical literature in Latvia and eye witness stories, historical development of blood donor movement in Latvia as well as its role in health care as a part of economics is studied in this paper.