Biodiesel is renewable and environmentally friendly fuel, which can be used as a substitute for diesel in compression ignition (CI) engines. Nowadays it is also successfully used not only in transport sector, but also in commercial construction equipment and space heating. As the production of biodiesel (rapeseed methyl ester RME) is started now and is planned to grow rapidly, it is necessary to investigate biodiesel impact on engine performance and exhaust gas composition. This paper describes results of the investigation the aim of which was to find out the impact of biodiesel and its blends on an engine's dynamical, economical and ecological parameters in laboratory conditions on an engine test bench. The experimental work was done with an XD2P diesel engine in the Motor testing and biofuels laboratory of the Motor Vehicle Institute of Latvia University of Agriculture. The engine was fuelled on fossil diesel, rapeseed methyl ester (RME) and on blends of 5 (5RME) and 35 (35RME) percent RME/diesel fuel. The results indicated that power for biodiesel and blends was lower than with ordinary petrol diesel on average. 7.9% on 100RME and 3.6% on 35RME. The reduction in torque and increase in fuel consumption was observed. Experimental results showed that the addition of RME to diesel can significantly reduce oxides of nitrogen (NOx), carbon monoxide (CO), and absorption coefficient.

According to EU Water Framework Directive, anew model of land reclamation management and financing will be developed. Taking into consideration the high vale of state investment required to ensure a steady work of land reclamation systems, it is important to reject the funds allocated on an equality principles and to give preference to the regions where the maintenance, rehabilitation and repair of these structures is more effective. The discussion concerning the allocation of state funds is elaborated in this paper. On the basis of statistical analysis, natural and economical regional differences were evaluated. Four scenarios of the allocation of special subsidies from state budget are submitted for approval. When modelling the financing results based on the regional distribution methodology, the changes in base financing indices are under discussion.

The paper presents study results on nutrient leaching in crop rotation fields where slurry was applied. The studies were carried out within the period of 2001-2003. As the study results have shown, phosphorus (P) concentrations much depend on drainage runoff. Increasing drainage runoff resulted in decreased P concentrations (r=0.7). P leaching also depends on the precipitation amount (r=0.83). Higher precipitation rates resulted in more intensive P leaching. P leaching more depended on the drainage runoff and the type of cultivated crops rather than on fertilization rates. P leaching also depends on the precipitation amount (r=0.83). Higher precipitation rates resulted in more intensive P leaching. P leaching more depended on the drainage runoff and the type of cultivated crops rather than on fertilization rates. P leaching decreased when higher amounts of phosphorus were accumulated in crop yield; the mineralization process of vegetative residuals that were left in the test field enhanced more intensive P leaching. When slurry was applied on crops of the test field, P concentrations never exceeded maximum allowable rates determined in normative documents of the environment of Lithuania. From the point of view of the environment protection, it is more expedient to apply slurry in spring because in this season of the year the leached amount of total P input into the soil is 37.5% less compared to its leached amount when slurry is applied in autumn.

The research paper summarizes the results of the influencing factors of small and medium enterprises development: government's policy, access to short and long term financing with reasonable interest rate, investments, tax system, geographical environment, business environment and infrastructure, experience and knowledge. Most of all the small and medium enterprises development is influenced by the investments but also other factors have very significant role.

The paper is aimed at the assessment of opportunities for the financing of innovative activities in Latgale region. The analysis is based generally on the case of Rezekne. Firstly, the problem is determined - Latgale is the weakest region in Latvia from economical development point of view. Secondly, the overview of the financial resources for innovative activities is given. Finally, the author argues his opinion on necessity to develop innovative business in order to improve the situation in Latgale. One of the most important aspects that hamper Latgale's development is the lack of financial resources. The optimal schemes for the financing of innovative business are offered. The research lead to the conclusion that finances for sustainable development of innovative business could be attracted through the Latgale's small enterprises (SMEs) cooperation with regional higher education institutions (Rezekne Higher Education Institution, Daugavpils University), business support centres and Rezekne Special economical zone structures.

In the article there are used statistical data about Latvia rural private households of the years 2001 and 2003. The distribution of natural households in Latvia countryside is investigated. The possibilities of the use of input-output models in the research of natural rural household economy are investigated. Making use of private household "Galakrogs" input-output tables for the years 1999, 2000, and 2001 published by A.Eglite, corresponding input-output models are compiled and their informative analysis is performed.

Same public goods can only be produced jointly with private goods. This paper focuses on the biological diversity that could be produced on semi-natural pastures through the assistance of grazing animals. The question that is being investigated is what shapes the total and marginal cost functions for biological diversity production on semi-natural pastures have if private goods are already being produced using livestock at farms near the pastures. The empirical analysis shows that a quadratic function describes the costs well and that the production is characterized by increasing marginal costs.

Agricultural development based on the laws of market economy enhances a change in the point of view on land as real property and search for optimal variants of its possible usage. As a large part of all agricultural land has been drained, efficient functioning of water regime regulation means is one of the essential factors determining the possibilities of land use as well as its value. Land areas where land reclamation structures are in good condition and do not needs to be repaired or reconstructed will always be of higher demand under the conditions of market economy. Present prices of agricultural land do not show the value of land reclamation systems. Therefore a complex land assessment is needed in respect of the present condition of land reclamation structures, its age and probabilities of failures.

The results of synthesis and analysis regarding the structural diversity of farms, their differences, divergence and development in Jelgava district and Zemgale agricultural region are expanded in the article. Commercial farms and semi-subsistence farms are particularly studied on the basis of farm accountancy data.

Germinated grains are added to wheat dough with the purpose to promote the biological value of bread. As a result, a new product was obtained with a higher content of protein, fibre, B group vitamins; and vitamins C and E. The task was to investigate gluten quality changes at grain germination time, wheat dough rheological properties changes with various wheat, rye and barley amount additions, germinated for a different time. With the purpose to save maximum stability value of gluten, it was ascertained that the germination time of wheat grain could not be more than 24 hours. The best dough quality was obtained with germinated wheat grain additive. Germinated rye and barley grain additive (more than the experimentally ascertained amount) increases dough softening, decreases dough development time and dough stability. Only adding experimentally determined optimal amount of germinated grain, which promotes high quality bread, could produce dough with accepted rheological properties.