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Tables, formulas and exercises with key for biometrics
Tadeja Kraner Šumenjak, Vilma Sem, 2018, other educational material

Abstract: This publication includes some materials we use in the one semester bachelor course entitled Biometrics, at the Faculty of Agriculture and Life Sciences. In the last few years, several foreign students came to study at the University of Maribor. A certain number of them came to study at the Faculty of Agriculture and Life Sciences, and because the foreign students are not able to follow the lectures in Slovene, we organized lectures in English. Since there was no learning material in English that would deal with the basics of statistics through solving real problems from agriculture using the statistical program SPSS, we decided to translate and publish these materials, and thus make them more available.
Keywords: biometrics, statistical tables, statistical formulas, SPSS, exercises
Published: 06.07.2018; Views: 90; Downloads: 7
.pdf Full text (2,07 MB)

Variations in leaf total protein, phenolic and thiol contents amongst old varieties of mulberry from the Gorizia region
Tina Ugulin, Tamas Bakonyi, Rebeka Lucijana Berčič, Andreja Urbanek Krajnc, 2015, original scientific article

Abstract: Preserving the plant genetic resources of genus Morus is insuff­cient but undoubtedly vital for conservation of the world’s germplasm for our successors. This research was focused on old mulberry varieties from the Gorizia region in Slovenia which were assessed for their contents on crucial metabolites (proteins, phenolics and thiols) in leaves regarding their antioxidant and nutraceutical potentials. Total proteins were measured spectrophotometrically by following the procedure of Bradford, the total phenolic contents were determined using the Folin-Ciocalteu method and thiols were established with monobromobimane fluorescent dye. The presented metabolite screening showed that some of the evaluated genotypes had higher concentrations of glutathione and were superior in contents of proteins and phenolics when compared to the results of other authors and could be propagated as highly recommendable feed for silkworms, and other animals.
Keywords: feeds, glutathione, Morus, phenols, proteins
Published: 14.11.2017; Views: 165; Downloads: 8
.pdf Full text (359,62 KB)

The effect of late autumn cutting of lucerne (Medicago sativa L.) on the growth rhythm of the first cut in the following year
Miran Podvršnik, Anastazija Gselman, 2016, original scientific article

Abstract: The field experiment aimed at determination of influence of autumn harvest on rhythm of the growth of lucerne (Medicago sativa L.) and yield quality of the first cut in the following year was carried out in Spodnji Gabernik (258 m above sea level, 46°15′54.94″ N and 15°34′6.05″ E), in the fourth growth year of the lucerne variety ‘Soča’. The experiment was designed as a randomized block in four replications. The individual treatments represented weekly autumn cuttings (1) 24/9/2014, (2) 01/10/2014, (3) 08/10/2014, (4) 15/10/2014 and (5) 22/10/2014. The paper presents data associated with the amount of lucerne dry matter yield (DMY) per treatment compared with the DMY of the first spring cut in the year 2015 (18/05/2015). The growth rhythm of lucerne in each treatment, which took place before the first cut in year 2015, was based on the measurements of the height of the plants. The yield quality was evaluated by NIRS method for determination of crude protein (CP), the net energy of lactation (NEL) and metabolic energy (ME) in dry samples regarding to DMY of each treatment. In autumn 2014, statistically significant higher dry matter yields were obtained in later harvested treatments (5 and 4). Similarly, in spring 2015 the trend of higher crop dry matter yield was observed in treatments harvested later in the autumn of 2014. However, the differences were not significant. Statistically significant differences between treatments were acquired within CPY, NELY and MEY. Before the first mowing, in spring 2015, statistically significant trend of higher plants was also detected in treatments with later cutting in 2014.
Keywords: Medicago sativa, cutting regime, growth rhythm, dry matter yield
Published: 14.11.2017; Views: 236; Downloads: 19
.pdf Full text (346,98 KB)

The accuracy of the germination rate of seeds based on image processing and artificial neural networks
Uroš Škrubej, Črtomir Rozman, Denis Stajnko, 2015, original scientific article

Abstract: This paper describes a computer vision system based on image processing and machine learning techniques which was implemented for automatic assessment of the tomato seed germination rate. The entire system was built using open source applications Image J, Weka and their public Java classes and linked by our specially developed code. After object detection, we applied artificial neural networks (ANN), which was able to correctly classify 95.44% of germinated seeds of tomato (Solanum lycopersicum L.).
Keywords: image processing, artificial neural networks, seeds, tomato
Published: 14.11.2017; Views: 201; Downloads: 7
.pdf Full text (353,43 KB)

System dynamic models as decision-making tools in agritourism
Tadeja Jere Lazanski, 2016, original scientific article

Abstract: Agritourism as a type of niche tourism is a complex and softly defined phaenomenon. The demands for fast and integrated decision regarding agritourism and its interconnections with environment, economy (investments, traffic) and social factors (tourists) is urgent. Many different methodologies and methods master softly structured questions and dilemmas with global and local properties. Here we present methods of systems thinking and system dynamics, which were first brought into force in the educational and training area in the form of different computer simulations and later as tools for decision-making and organisational re-engineering. We develop system dynamics models in order to present accuracy of methodology. These models are essentially simple and can serve only as describers of the activity of basic mutual influences among variables. We will pay the attention to the methodology for parameter model values determination and the so-called mental model. This one is the basis of causal connections among model variables. At the end, we restore a connection between qualitative and quantitative models in frame of system dynamics.
Keywords: agritourism, multi-criteria decision-making, modelling, system dynamics
Published: 14.11.2017; Views: 113; Downloads: 18
.pdf Full text (525,84 KB)

Sweet maize growth and yield response to organic and mineral fertilizers, N rates and soil water regimes
Franc Bavec, Martina Bavec, Silva Grobelnik Mlakar, Milojka Fekonja, 2015, original scientific article

Abstract: Sweet maize is an underutilized vegetable in European temperate areas, and its consumption is increasing. For better understanding of cultivation practices, this pot experiment aimed to determine the eff­ects of diff­erent water regimes and nitrogen (N) rates calculated from N target values. N rates of 0 (control), 0.6 and 2 g N pot$^{-1}$ were applied as organic by-products pumpkin cake and pig manure digestate, and mineral fertilizers CAN 27 and ENTEC®26. Treatments of water supply were based on measured soil matric potentials of 2.8 pF (drought stress), 2.6 pF (optimal water) and 2.4 pF (overwatered). In comparison to mineral fertilizers, pumpkin cake proved to be equal in eff­ectiveness in plant height (155.8 cm), cob (85.8 g), green (124.9 g) and leaf mass per plant (44.2 g), or even better in root (72.3 g) and broom mass per plant (3.0 g). Yield parameters, cob mass (70.1 g), its length (6.3 cm) and diameter (2.0 cm), as well as the residual mineral N (59 mg N kg$^{-1}$) significantly increased at the highest N rate. Significantly lower values of the evaluated morphological parameters and photosynthetic rates (at brooming and harvesting) were associated with drought stress. The matric tension of 2.6 pF was established as an appropriate water regime for sweet maize growth.
Keywords: Zea mays L. saccharata Sturt., nitrogen, fertilizers, soil water potential, growth conditions
Published: 14.11.2017; Views: 142; Downloads: 25
.pdf Full text (257,82 KB)

Perspectives of Christmas rose (Helleborus niger L.) genetic improvement
Andrej Šušek, 2016, original scientific article

Abstract: The Christmas rose is becoming a very important ornamental plant on the market. It is relatively new to intensive production technologies. The number of genetically-improved varieties on the market is limited, and many of the old cultivars are no longer available because of slow and economically unfeasible vegetative propagation. In the future, its genetic improvement will probably become inevitable. New cultivars will have to satisfy the specific requirements of the market and producers as well as strict environmental policy. In order to obtain new cultivars it will be necessary to evaluate the existing germplasm and apply an adequate genetic breeding approach. There are seven main possibilities of creating new varieties: the use of natural variation associated with seed germination, population approach based on recurrent selection, individual selection based on specific genetic combinations, the creation of inbred lines and the formation of hybrids, interspecific hybridisation, mutagenesis and genetic engineering. Molecular markers can be very helpful during the breeding process. They can be used in order to study genetic relationships amongst populations, ecotypes, varieties, and hybrids.
Keywords: Christmas rose, Helleborus niger, cultivars, breeding perspectives
Published: 14.11.2017; Views: 121; Downloads: 29
.pdf Full text (468,79 KB)

Nanotechnology in food safety and quality assessment
Maša Primec, 2016, review article

Abstract: A rapid microbial detection in different biological and environmental material is a key of preventing several foodborne diseases. By implementing nanotechnology into food safety sector, a great step towards successful, reliable and sensible detection methods of foodborne pathogens has been achieved. Therefore, the aim of this review was to illustrate some of the principal functions of nanotechnology-based techniques, used for microbial detection in the last few years. Regarding consumer’s health, the review also discusses the question of safety, concerning human exposure to nanomaterials (NMs). Due to their different composition-unique properties, such as greater penetrability, reactivity and high surface to volume ratio, NMs have been coupled to several biomolecules and integrated in special system devices, resulting in improvement of sensitivity in transmitting biological signal informations in a shorter time. Among all the NMs, gold, magnetic and fluorescent nanoparticles (NPs) have been widely used, also in microbial diagnosis. Despite the success of linking nanotechnology to detection of foodborne pathogens, the exposure to various NMs could also be a matter of potential risk to human health, although conclusions still need to be definitely proven.
Keywords: nanotechnology, food safety, nanoparticles, diagnosis, foodborne pathogens
Published: 14.11.2017; Views: 113; Downloads: 11
.pdf Full text (463,07 KB)

In vitro tissue culture initiation from potted and garden Hydrangea macrophylla explants
Metka Šiško, 2016, original scientific article

Abstract: The effect of sterilisation treatments on the initiation of the culture of three Hydrangea macrophylla genotypes in vitro was studied. The results indicated difference among different disinfection treatment; the consequence of treatments with dichloroisocyanuric acid, in combination with silver nitrate, was a significantly higher survival rate comparing to treatments based on NaOCl. Success of sterilisation was significantly influenced by studied genotypes. Two potted hydrangea genotypes (G2 and G3) showed higher survival rate (45.00 %, 55.00 %, respectively) comparing to the genotype 1 (originated from a local garden), which exhibited the highest percentage of contamination rate (58.75 %). Culturing the explants on a McCown woody plant medium supplemented with BAP at 2 mg/L and NAA at 0.005 mg/L produced the highest number of shoots with multiplication rate of 1.31 in 5 weeks. The highest rooting percentage (100.00 %) was obtained with the genotype 2 on a McCown woody plant medium supplemented with 0.5 mg/L IBA.
Keywords: micropropagation, tissue culture, hydrangea, Hydrangea macrophylla, plant disinfection
Published: 14.11.2017; Views: 153; Downloads: 17
.pdf Full text (271,02 KB)

Impact of various types of anti-hail nets on light exposure in orchards and quality parameters of apples
Marinka Brglez Sever, Stanislav Tojnko, Tatjana Unuk, 2015, review article

Abstract: The new Common Agricultural Policy (CAP) has been designed to shrink funds that Hungarian agricultural reform will in Nowadays, anti-hail nets are a part of basic equipment in a modern apple orchards. They decrease the risks of apple production and thus allow regular and quality apple harvest. Colours of nets differently obstruct the passing of light through the net, which directly affects some quality parameters of the yield, especially the fruit skin colour. The article includes a brief overview of studies associated with the impact of light exposure under different types of anti-hail nets on quality of apple fruits, as well as investigations which deal with adaptation of various technological measures, such as the use of reflective ground foil. A part of data from the existing literature explains the effect of anti-hail net usage on forming a microclimate under the net, and consequently, its effect on the development and dynamics of diseases and pests.
Keywords: anti-hail net, light, microclimate, apples, yield quality
Published: 14.11.2017; Views: 121; Downloads: 10
.pdf Full text (173,10 KB)

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