1,344 Works

Combustible in selected biofuels

I. Vitázek, J. Tulík & J. Klúčik
The aim of the research was to determine the moisture, combustible and ash content in selected biofuels, in dependence on temperature by the means of gravimetric method. For this purpose, the furnace Nabertherm L9/11/SW/P330 was used. Analyzed samples cons isted of crushed biomass which is used in small heat sources (e.g. spruce wood, cherry wood, apple wood, black locust wood) with bark and without additives. Biomass for larger heat sources (woodchips cuttings from coniferous trees),...

The role of field beans in nutrition of Boer goat

E. Aplocina
A study on the effective using of field beans to Boer mother goats feeding was carried out on a farm whose main activity is the production of goat meat. Since the Boer goat breed is still very rare in Latvia, there is a lack of experience in the feeding of meat goat. Goat productivity was analyzed according to the birth weight of goat kids a nd kids live weight at 50 days, as well as...

Properties of local produced animal-fat based biodiesel and its blend with fossil fuel

K. Sirviö, S. Heikkilä, R. Help, S. Niemi & E. Hiltunen
In the near future, more emphasis must be put on reducing greenhouse gas (GHG) emissions in road transportation, house heating, agricultural activities, marine transport etc. This study concentrated on the use of alternative fuels in engine - driven applicat ions of non - road machineries and decentralized energy production . Today, the engines are mainly designed for crude oil derived fuels and liquid renewable fuels are blended with crude oil based fuels to fulfill the...

Exhaust particle size distributions of a non-road diesel engine in an endurance test

T. Ovaska, S. Niemi, T. Katila & O. Nilsson
The main objective of this study was to find out how th e non - road diesel engine running period of 500 hours affects the exhaust particle size distribution. By means of an engine exhaust particle sizer (EEPS), particle number was measured before the endurance test and after 250 and 500 hours of engine operation . The size distributions were determined at full and 75% loads both at rated and at intermediate speeds. The soot,...

Lake blue clay - sapropel - flax shive briquettes for water absorption and desorption

R. Tretjakova, A. Martinovs, M. Avisane & G. Kolcs
Latvian lakes are rich in sapropel sediments and below the sapropel layer there is another valuable natural resource, namely blue clay. Flax shives are formed in large quantities as a waste in flax processing factories. The problem involves processing and rational use of these reso urces. The paper studies the obtaining of briquettes from flax shives using sapropel and lake clay as a binding material. Briquettes are intended for use in cases when problems with...

Sõnniku mõjust maheviljeluslikult majandatavas külvikorras

Malle Järvan
Organic agriculture is a production system which relies on ecological processes. In the organic farming systems, it is important to improve soil fertility and to protect soil physical condition for its healthy functioning. The benefit from organically cultivated crops is strongly related to the maintenance of soil fertility based to a great extent on the soil organic matter content. Farmyard manure is one of the more valuable organic fertilizers maintaining soil fertility in the systems...

Technical design of complex vision-tactile navigation system for using of blind persons navigation

J. Volf, F. Škeřík & V. Novák
This article presents the system used for navigation and orientation of blind persons in an unknown terrain. This system called ‘ Tactile Navigation System ’ constitutes a compensation instrument for blind persons. It is composed from three basic elements: a camera, a control unit and a tactile activator. The tactile navigation system converts the image from the camera to the tactile information and it transfers this information to the blind person. The blind person can...

Assessment of soil electrical conductivity using remotely sensed thermal data

K. Křížová, J. Haberle, M. Kroulík, J. Kumhálová & J. Lukáš
Detection of heterogeneity (crop, soil, etc.) gained a lot of importance in the field of site - specific farming in recent years and became possible to be measured by different sensors. The therma l spectrum of electromagnetic radiation has a great potential today and experiments focused on describing a relation between canopy temperature and various vegetation characteristics are conducted. This paper was aimed to examine the relation between canop y temperature and electrical conductivity as...

Shrinkage effect on diffusion coefficient during carrot drying

A. Aboltins, T. Rubina & J. Palabinskis
Many studies have been previously carried out on the carrot drying and the undergoing processes. The developed mathematical models provide an opportunity to gain an understanding of this complex process and its dynamics. But they are sim plified and based on a number of assumptions, including calculation of diffusion coefficient values. In one of the previous studies, the authors of this study determined that the diffusion coefficient is linearly dependent on the moisture concentration wit...

Sapropel processing approaches towards high added-value products

V. Obuka, M. Boroduskis, A. Ramata-Stunda, L. Klavins & M. Klavins
Sapropel is an organic sediment from fresh water bodies that is widely distributed in the northern regions of the w orld. The distribution and unique properties of sapropel make it an important natural resource that can be used in agriculture , horticulture, forestry and farming directly as obtained. The aim of this study was to investigat e the extraction possibilities of sapropel and potential applications of its extracts. Humic substances constitute an important ingredient of...

Performance evaluation of rural areas: the case of Estonian rural municipalities before the administrative reform

H. Luik-Lindsaar, R. Põldaru, A. Põder & J. Roots
Estonian municipalities have recently pa ssed an administrative reform that has resulted in the reorganisation of municipal management and decreased the number of municipalities. Unfortunately, no thorough scientific research has been done to find out whether the emerging helps to increase the ef ficiency. The aim of this paper is to estimate the efficiency of Estonian rural municipalities and to identify the factors that influence their efficiency. In this study we use a two stage...

Festulolium seed production dependence on fertilizer application system

V. Obraztsov, D. Shchedrina & S. Kadyrov
Festulolium ( × Festulolium F. Aschers. et Graebn.) is a new perennial grass Роасеае family. The benefits of this culture are good regrow capacity, increased sugars content and higher winter hardiness. It can be used as a green feed when c reating cultivated hayfields and pastures. Widespread application of this new culture for forage production is constrained by the shortage of seeds, due to the imperfection of their production technologies. There are still very few...

Using the FEM model for design the heat treatment of an agricultural tools

A. Kešner, R. Chotěborský, M. Linda & M. Hromasová
Agricultural tools need mechanical properties such as abrasive wear, hardness and toughness. These mechanical properties are achieved by choosing a suitable steel and subsequent heat treatment of the steel. Phases of the microstructure affects the final steel properties. The phase composition in the steel is influenced with the designing of the heat treatment. 25C rMo4 steel was investigated for the production of agricultural tools. The heat treatments ware designed for different cooling conditions. The salt...

Soil sampling automation using mobile robotic platform

E. Väljaots, H. Lehiste, M. Kiik & T. Leemet
Land based drone technology has considerable potential for usage in different areas of agriculture. Here a novel robotic soil sampling device is being introduced. Unmanned mobile technology implementation for soil sampling automation is significantly increasing the efficiency of the process. This automated and remotely controlled technology is enabling more frequent sample collection than traditional human operated manual methods. In this publication universal mobile robotic platform is adapted and modified to collect and store soil s...

Crop weight measurement sensor for IoT based industrial greenhouse systems

A. Avotins, A. Potapovs, P. Apse-Apsitis & J. Gruduls
No wadays the industrial management systems are changing by means of implementing various Internet of Things (IoT) technologies, allowing a simple integration of sensor technologies with wireless communications and development of cloud based database solution s. The industrial greenhouse management systems are not the exception in this regard, as they are becoming more and more popular with the use of various sensors for the automation of the vegetable and other crop cultivation process.The general aim...

Evaluation of the fuel commercial additives effect on exhaust gas emissions, fuel consumption and performance in diesel and petrol engine

I. Janoško & P. Kuchar
The paper deals with the impact assessment of the additives used in diesel and petrol fuel to improve the power and emission parameters of the vehicle and its consumption. The usage of additives in engine fuels have an increasing tendency. The manufacturers claim that ad ditives have positive impact on engine operating parameters, cleaning the fuel supply system and decreasing fuel consumption by improving the engine combustion process. Based on the above statements, measurements were...

Optimising cold compressive recovery of oil from the seeds of Sesame (Sesamum indicum L.)

O.L. Akangbe, R. Adamovský & F. Mošna
Effects of the time rate of deformation and aspect ratio on mechanical response and performance in single cycle cold compression scheme were investigated for bulk sesame seeds and response forms fitted using forward stepwise multiple regression technique. The degree of deform ation was dependent on the time rate of its induction and the equipment’s aspect ratio. Energy requirement correlated positively with deformation rate and aspect ratio. Energy expenditure was however more efficient with larger aspect...

Effect of PTO- driven tillage machines on soil particles transfer

M. Buřič, P. Novák & J. Hůla
Displacement of soil particles by erosion can be seen as a major threat to the quali ty of agricultural land in the conditions of Czech Republic. While the effects of water and wind erosion have long been investigated and reported, the effect of soil tillage technology on soil particles translocation are relatively new area of agriculture research. Soil tillage may contribute to the undesirable translocation of soil particles towards lower - lying parts of fields...

Soil bulk density and phytosanitary conditions at potato field

Luule Tartlan & Edvin Nugis
The aim of this paper is to present the microorganisms and their activities and soil bulk density. It is a fact that both have a great impact on soil fertility and its health status. Among the microorganisms in soil, the bacteria and fungi are the most important ones for potato cultivation; the bacteria living on the plant roots serve to uphold the nutrient intake of plants. Our previous research has shown that Paenibacillus Polymyxa Rizobacter...

Application of conversion model for designing hydrodynamic pumps in turbine mode

M. Polák
The use of the smallest water resources has been coming again to the centre of interest in recent years. A water engine – turbine, is the heart of these power plants. This is usually the highest expense for the investor, in terms of cost. The effort is therefore to seek investment less demanding alternatives. One of them is the use of hydrodynamic pumps in reverse turbine operation. This paper provides a methodology for conversion of...

Additional concentrates do not affect feeding times of cows, but social positions of cows do

Maria Soonberg, Marko Kass, Tanel Kaart, Ragnar Leming & David R. Arney
In robotic milking dairy systems lack of control over intakes can be problematic for balancing the forage and concentrate portions of diets. This can lead to proble ms associated with high concentrate intakes and concomitant low forage intakes. To check this as a problem, the feeding behaviour of cows was observed: the number of daily visits to the feed barrier, the duration of these visits and actual feeding, of high and low yielding cows. The...

Assessment of Calotropis natural dye extracts on the efficiency of dye-sensitized solar cells

A.H. Alami, K. Aokal, D. Zhang, M. Tawalbeh, A. Alhammadi & A. Taieb
This work presents the construction and testing of solar cells sensitized with natural dyes extracted from plants indigenous to the desert. Calotropis plants are self - sufficient as they grow in very harsh environments, and yet are not consumed by humans or livestock due to their irritating agents to the skin and eyes. The energy generators of these plants are the leaves, which are crushed and processed to produce the dye solution. Also, the Calotropis...

Efficiency of the use of field beans in fattening lambs

D. Kairisa & E. Aplocina
The breeding and feeding of self produced pulses to livestock is one of the important directions of research for reducing the production costs of livestock products. Experiment on the effective using of the field beans to lambs for fattening was arranged in three replications using the Latvian Da rk - headed breed male lambs. The mixture of concentrated feed consisted of 50% of bean and 50% of oat. Lambs were weighed at the starting and...

Mathematical model of cleaning potatoes on surface of spiral separator

V. Bulgakov, S. Nikolaenko, Margus Arak, I. Holovach, Z. Ruzhуlo & Jüri Olt
Cleaning potato tubers from soil impurities and plant debris after digging them out of soil is a topical problem in the work process of potato production. Therefore, the engineer ing of new designs of potato heap separators necessitates the further studying of them and the optimisation of their kinematic and design parameters, which must not only ensure the high quality of cleaning, but also rule out the possibility of damaging the tubers. The aim of...

Inoculation technology for legumes based on alginate encapsulation

E.N. Shcherbakova, A.V. Shcherbakov, P.Yu. Rots, L.N. Gonchar, S.A. Mulina, L.M. Yahina, Yu.V. Lactionov & V.K. Chebotar
The main purpose of seeds inoculation is to provide the sufficient number of viable efficient bacteria that are able to actively colonize the plant roots immediately after germination. One of the promising forms of bacterial preparations is cells encapsulation in the polymer gel. Advantages of using alginate microspheres are slow, controlled release of bacteria, biodegradation in the soil and an increased shelf life. As a result of this study the effectiveness of using capsulated biopreparation...

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  • Estonian University of Life Sciences
  • Vinnytsia National Agrarian University
  • National University of Life and Environmental Sciences of Ukraine
  • Nepal Agricultural Research Council
  • National Academy of Agrarian Sciences of Ukraine
  • Ghent University
  • National Academy of Sciences of Ukraine
  • Estonian Crop Research Institute
  • Dnipropetrovsk State Agrarian and Economic University
  • Central Ukrainian National Technical University