The paper analyses possibilities to model the concentration of DIN - a harmful pollutant from the eutrophication point of view-contained in the stream and self-purification processes of the stream. During the studies the data of a small right affluent of the river Musa (administrative district of Birzai) was used. The data comprised results of natural observations about the changes in DIN concentrations during the vegetation period and cold period of the year. The model of pollution dispersion through the stream is a parabolic differential equation with partial derivates, initial as well as boundary conditions. Constant DIN pollution in a stream stretch containing constant hydrological parameters and adequate environment conditions is proportional to the concentration of pollutants inflow. Further from the pollution source the constant pollution is exponentially decreasing. At the distance expressed by x (m) from the initial pollution concentration c0 measuring place, DIN concentration is expressed by C(x) = c0eE-0.00017x in the cold season of the year and by in C(x) = c0eE-0.00031x during the vegetation period. The stream polluted in the result of agricultural activity, further flowing through forest-covered area is significantly purified already at a 1.5 km stretch. Relatively, DIN concentration decreases about 3.8 times a day during the vegetation period and about 2.7 times a day during the cold season of the year.

The paper presents the investigations performed by Water Management Institute of Lithuania University of Agriculture on the pollution and treatment efficiency of wastewater formed in an up-to-date slaughterhouse built in 2003. Wastewater is canalized from the slaughterhouse by red and green sewerage systems. Initially the wastewater is pre-treated in a fat separator, further treatment process is performed in physical-chemical treatment facilities and settling ponds. After primary treatment, the wastewater is directed into two-stage constructed wetlands of horizontal flow. The wastewater in slaughterhouse is about 4-5 times more polluted than domestic wastewater containing even 20 times higher for concentration. During the primary treatment process (fat separator + physical-chemical treatment device + settling pond), from 73.1 to 98.9% of pollutants are removed. After primary treatment, indices of wastewater are similar to those of domestic wastewater: pH - 8.5, biochemical oxygen demand (BOD5) - 98 mg lE-1 of O2, Ntotal and Ptotal - 46 and 8.9 mg lE-1 respectively. After biological treatment in two-stage constructed wetlands of horizontal flow, the wastewater satisfies the environmental protection requirements according to organic (BOD5) and biogenic (Ntotal and Ptotal) pollutants and thus may be realised into the environment. Regression dependencies of medium and strong relation (R**2=0.503-0.893) of pollutants BOd5, SS (suspended sediments), Ntotal and Ptotal in treated wastewater on the total of constructed wetlands have been determined.

In the process of biological wastewater treatment, P-removal is efficient enough when the concentration of organic pollutants according to BOD5 (biochemical oxygen demand) is no higher than 190 mg lE-1 of O2 and its relationship with phosphorus does not exceed 20. Having studied the composition of wastewater from dairy farms it was determined that wastewater pollution according to BOD5 is from 800 to 900 mg lE-1 of O2 and the ratio of BOD5/Ptotal is 30-36. The paper gives the results of the tests on P-removal from wastewater carried out in a laboratory model. During investigations wastewater was flowing via mineral filters (filtralite P (FLP), zeolite (CE), and shulgite (SG)). Total amount of Ca, Fe and Al oxides contained in those filters were 23.0, 16.1 and 7.9% respectively. The rates of P-removal from wastewater in the filters were as follows: 88.5% (FLP), 45.5% (CE), and 96.3% (SG). Considering different hydraulic load, P-mass balance was calculated. The calculation results showed the following P absorption amounts: FLP - 5.08 g dE-1, CE - 1.76 g dE-1, and SG - 3.91 g dE-1 (calculated for 1 m**3 of each filter). Wastewater filtration through mineral media resulted in the removal of other pollutants, too: organic pollutants removal (according to BOD5) was 30.8 to 72.5%, and the removal of nitrogen compounds (more than 90% of which were in the form of ammonium salts) was even 93.2% in CE filter.

Constructed wetlands (CW) are considered as one of principal wastewater treatment methods containing and soil filters. CW may be of subsurface vertical flow (VF) and horizontal flow (HF). The objective of the studies was to estimate N-removal efficiency differences in CW of vertical and horizontal flow. To evaluate nitrogen (N) removal efficiency, the database of the studies on both construction of CW collected within the period of 1995-2005 was used. Horizontal filter systems characterize for a 1.6 times higher N-removal efficiency than vertical filters. Generally, N-removal efficiency depends on the load of filters. When filter load was 1.5 g mE-2dE-1 according to TN, N-removal efficiency is 39.6 and 24.0% in HF and VF systems respectively. Considering the seasons of the year, no significant difference was observed in N-removal efficiency in HF and VF systems during cold and warm periods of the year. N contained in water after the treatment process in filters is detected in different forms. NH4-N is prevailing in HF, while in VF systems NO3-N is dominant. It was also observed that NH4-N in the effluent during the initial operation of VF after the construction works in the first two months in the warm and in four months during their operation in the cold period of the year was prevailing.

The research work of current paper is dedicated to the problems that appear in resource attraction processes of the Cohesion Fund (CF) in Latvia. Latvia has an access to branches of financing covered by CF - transport and environment. These branches require harmonized legislation. Successful administrating is assured by effective institutional system. The weaknesses of CF management system in Latvia are figured out so rendering ideas to the reader to be studied further.

This article analyzes the experience of economic clustering of Finnish industry. This experience is described in the report of the fundamental investigation which was carried out by the Research Institute of the Finnish Economy (ETLA) - Advantage Finland - The Future of the Finnish industries. The study deals with the competitiveness and future growth prospects of the Finnish industry on the basis of Michael E. Porter's theory of the competitive advantage of nations. The comparative advantage of Finnish industries has been moving from capital-and resource-intensive branches to those driven by know-how and technology. The author recommends to study this experience and to use it in Latvia. The finding of the real and potential business-groups in the economy of Latvia may be realized with the algorithm of clustering described by the professor of Colombian University (USA) David Stark on the base of Lursoft data of the Latvian enterprises.

The paper focuses on the exposition of the research results on agricultural resources in Kurzeme peninsula-climatic resources, qualitative evaluation of the land, condition of land amelioration, topographic resources, and structural breakdown of farm land by types of use. It is concluded that extremely various climatic and soil conditions govern in the region. The Southeast part of Kurzeme peninsula is displayed very favourably by the aggregate value of agricultural resources. Labour productivity in Kurzeme has been analysed as well.

The article is meant to analyze the methodological qualitative characteristics of the creation of employees' motivation. These characteristics help to measure the reliability of research instruments. In accordance with Kendal ranking correlation (Henning, 1997) there are identified motivation indicators of managing employees and executives. The main attention is paid to the importance of motivation models' shaping and the essential principles by giving the results of model shaping and their interpretations.

The scientific article is prepared using monographic research method. The most important works by several scientists are examined. The author analyses guidelines for strengthening of civil society within Decree of 2005 by the Cabinet of Latvia; previous research on social capital in scientists' works is considered and indicators regarding economics of Latvia are characterized; formal and informal social networks and their norms are cleared. Importance of civil society is suggested by the Cabinet Decree No. 98 Guidelines of Strengthening Policy for Civil Society in 2005. The guidelines and directions for strengthening of civil society for the ten years describe actuality of this program. This theme is less researched in Latvia. Civil society promotes democracy, increases and mobilizes social capital, coordinating collaboration of citizens for common benefit. Civil society in Latvia is in its initial position. The concept of social capital by different foreign scientists and Latvian specialists is analysed in this article. American scientist R. Putnam (1995) has written about social capital that human capital regards individuals but social capital regards relationships among individuals as well as social networks and exchange norms. Another researcher F. Fukuyama (1995) analyses social capital by comparison of economical development of different peoples and nations. Research by several scientists on indicators of social capital and their use in economics of Latvia are analysed in the work. The author concludes that social capital of Latvia has tendency to develop, and social networks and their expansion is little explored in Latvia.

This research presents the antiradical activity and fatty acids changes of vegetable oils. Natural antiradical activity and its changes during storage for one and two years of rapeseed, linseed and hemp oils were determined with 1.1-diphenyl-2-picrylhydrazyl (DPPH). Fresh hemp oil shows the higher antiradical activity. The content of fatty acids of fresh rapeseed, linseed and hemp oils and of the mixture of rapeseed (800 g kgE-1) and linseed (200 g kgE-1) oils was determined by the method of gas chromatography. After heating the mixture of rapeseed and linseed oils at the temperature of 160-180 deg C, changes proportions in saturated and unsaturated fatty acids.