Biotehniska Fakulteta

Groblje, Slovenia

Biotehniska Fakulteta

Groblje, Slovenia
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Selenium is one of the essential elements that has a direct effect on human health and disease. Environmental conditions and agricultural practice have a profound influence on the selenium content in plants. Cultivation of plants enriched with the selenium has an effective potential for selenium supplementation in diets for population which is exposed to selenium deficiency. Bioavailability of selenium compounds from food is in strong correlation with the source and its chemical form. The selenium of different sources and forms can become a part of human consumption when entering the food chain, wherein the inorganic forms of selenium are metabolized and converted to more available organic forms. Numerous results of systematic research of the selenium content in individual plant species as well as various techniques for producing selenium enriched foodstuffs is reviewed. The soil in Slovenia is selenium-poor and may concern a part of population which is potentially sensitive to selenium status. The merits of selenium effect, either alone or in combination with different environmental changes on plant production published by Slovenian authors are thus closely considered. Controversies continue to prevail regarding adequate amounts for selenium for health and disease prevention. Thus, general and individualized recommendations for selenium intake and supplementation in the future need to be cautiously followed and the reference values continually revised.


Pogacar T.,Agencija Republike Slovenije za okolje | Kajfez-Bogataj L.,Biotehniska fakulteta
Acta Agriculturae Slovenica | Year: 2011

Grass growth models are valuable tool for grassland management for a decision support application. The grassland growth model LINGRA, which was developed to predict growth and development of perennial rye grass across Europe is presented and some of the main equations are described in this work. Key process simulated in the model are light utilisation, leaf formatin and elongation, tillering and carbon partitioning. Integration time step is one day. LINGRA provides algorithms for the simulatin of grass growth under irrigated and non-irrigated conditins. Model is relatively simple, but it contains the most imprtant features of grass growth. Validation of the model from independent historical European data showed that model predictions are sufficiently accurate to make it a useful aid for on-farm decision-making processes.


Jelen L.G.,University of Ljubljana | Skrabanja V.,Biotehniska fakulteta
Acta Agriculturae Slovenica | Year: 2011

The impact of ambient and filtered solar UV-B radiation and of selenium foliar treatment on the yield of naked seeds in pumpkins, Cucurbita pepo L. was determined. Seed yield was higher when solar UV-B radiation was filtered out. The results suggested that the reduced yield under solar UV-B radiation was related to the oxidative damage, as selenium foliar treatment increased the yield under ambient radiation conditions.


Sixty percent of all known true bugs (Heteroptera) are phytophagous. Economically the most important species belong to Cimicomorpha and Pentatomomorpha groups. The representatives of the latter are specially important, since they are harmful on cultivated plants. The Pentatomidae family is the 3rd largest from the Heteroptera (sub)order, and its the most harmful representative in Slovenia and in neighbouring countries is Eurydema ventrale. It is specially important because of the lack of insecticides registered against this pest in Brassica crops, where it occur most numerously. Beside this the species does not have any efficient natural enemy. Notwithstanding it is possible to reduce the number of E. ventrale below the economic threshold with the use of some environmentally acceptable control measures. In this context the choice of suitable host plants is very important, especially with the aim of use their natural resistance as well as for the purposes of other environmentally acceptable control measures (intercropping, trap crops etc.).


European Environment Agency composed the list of 163 most important invasive organisms, that are threatening European ecosystems. One of above mentioned invasive species is also the plant Japanese knotweed (Fallopia japonica), which grow on different soil types. In ruderal habitats the plant is most prevalent, however because of its competitive position the Japanese knotweed is becoming more and more important part of the ecosystems, because it is superseding indigenous species. Mechanical removal is only temporary solution of its extermination. While this plant species grows in urban areas and near the water, numerous researchers see the long-term solution of its extermination in biological control of this weed with introduction of natural enemy from its origin. In Japan Japanese knotweed has about 180 different natural enemies but only the psyllid Aphalara itadori has been prooved to be effective. Young larvae are the most damaging stage of the insect. With sucking of the plant juice, plant is not destroyed, it only develops slower. In Great Britain, which is the first area in Europe, where the above mentioned psyllid was introduced, species also overwinters in the open. The introduction od Aphalara itadori represent the first example of classical biological control of weeds not only in Europe but also worlwide.


Voncina M.,Biotehniska Fakulteta | Baricevic D.,Biotehniska Fakulteta | Brvar M.,Center za Zastrupitve
Acta Agriculturae Slovenica | Year: 2014

Many wild plants around us have beneficial effects on our body and can be used as food. People are more and more interested in the medicinal plants. Many of them began gathering and preparing plants for the relief of symptoms of diseases or as a food dietary. Due to the lack of knowledge of plants, mistaking plants that contain toxins for medical plants may happen and cause adverse effects or even poisoning. The Poison Control Centre in Ljubljana keeps records of patients who have been admitted to the department because of adverse effects from the ingestion of certain plants. We analysed 64 cases, which were registered by the Poison Control Centre between January 2000 and December 2013. The aim of the present study was to determine which plants cause the most intoxications in Slovenia.


Malovrh S.P.,Biotehniska Fakulteta | Stirn L.Z.,Biotehniska Fakulteta | Krc J.,Biotehniska Fakulteta
Sumarski List | Year: 2010

Private forest management is, particularly in Slovenia, far from optimal. The reason lies in the diversity of ownership and property structure. In addition, Slovenian private forest owners are not adequately organized and associated to manage their forests. The willingness of private forest owners to cooperate was evaluated using the questionnaires. The sample (n- 700) included equal shares of associated and non-associated owners. Forty-six percent of questionnaires were returned. The results of the survey analysis showed that 39.1 % of private forest owners were members of forestry associations (associated), 19.9 % owners showed willingness to cooperate i.e. to join a forestry association and 41.0% of the sampled forest owners were unwilling to cooperate. Based on the data obtained through the survey we have studied the relationship between ownership and property conditions in regard to the willingness of forest owners to cooperate. The Chi-square test showed the statistical significance of the relationship between the size of forest property and the willingness of owners to cooperate. Further, the results of multivariate logistic regression showed that it is necessary to search for private forest owners who are willing to cooperate in the group of forest owners who are younger than 50 years, who own more than 10 ha of forest land and live in common household with the co-owners.


Availability of healthy, nutritious and safe foods should be considered as fundamental and contemporary consumers would accept this as their granted right. The intensive lifestyle enables them to use own food sources very rarely. Instead, they are forced to choose products being available on the market. Responsibility for ensuring healthy and safe food is thus largely transferred to the food industry, but its offer to the consumer is not always fair and honest. Benefits stemming from the supply of adulterated foods are not a new phenomenon or a characteristic of modern society; it is irresistible temptation that reaches far into the past. The article highlights examples of food adulterations through the history as well as the causes, extent and consequences of abuse of consumer's dependence on food marketing system.


Jelen L.G.,Biotehniska fakulteta
Acta Agriculturae Slovenica | Year: 2011

The influence of air temperature on the chosen bee phenophases (Apis mellifera carnica Pollman) was studied in the period 1971-2007 in Novo mesto, Slovenia. The inter-annual phenophase variability (start, first bee pasture, pasture on black locust and pasture on linden) is high - variation interval is from 44 to 86 days. With time analysis it was established that as a result of higher air temperatures and earlier plant phenophases also the bee phenophases appear earlier in the last period. Statistically significant linear trend for the first bee pasture is -19 day/decade, for pasture on black locust it is -10 day/decade. Phenophase pasture on linden has no statistically significant trend. The correlation between phenological development and air temperature was studied with correlation analysis. The correlation coefficient values are between -0.45 and -0.70. All three phenophases are best correlated with average monthly temperatures in March and April. Simple regressions models for the prediction of the start of phenophases on the basis of air temperature were developed. As the models explanatory variables average monthly air temperatures and thermal time needed for an individual phenophase start were included. The accumulated thermal time was calculated as the sums of active temperatures (the sum of positive temperatures from January 1) and effective temperatures (the sum of temperatures above the temperature threshold 10 °C from February 28). The variability coefficients (KV) for the calculated thermal time are between 15 per cent and 43 per cent. With backward selection linear regression models for the prediction of time of the first bee pasture and pasture on black locust were formed. With the models we were able to explain 53 per cent to 91 per cent of variability at the start of phenophases.


Bernik R.,Biotehniska Fakulteta
Acta Agriculturae Slovenica | Year: 2015

Fruit of walnut (Juglans regia L.) belongs to stone fruits. This means that the lignified, stony endocarp, a shell, contains delicious kernel. On the tree a nut is surrounded by the green husk. In Slovenia and in the other parts of the world heavy tools (such as stone, hammer and hand-crusher for nuts) are used to remove nutshell. In the intensive walnut production heavy tools are not competitive with today world economy. This is because the priority in walnuts and nuts kernel production is to reduce costs. Walnut shell cracking devices are invented to reduce walnut handling costs and consumer price. Characteristics of this device and walnut kernel quality are presented in this research.

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