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Five lettuce cultivars ('Kiribati', 'Tourbillon', 'Carmesi', 'Lianabel', and 'Biondonna') were grown in the open-field experiment during the summer of 2018. The aim was to find the optimal summer lettuce cultivar according to morphological and production parameters, suitable for the fresh market and food industry processing by applying the MABAC (Multi-Attributive Border Approximation Area Comparison) method. The correlation analysis was carried out to reduce the number of criteria that have high coefficient values and a double influence on the ranking results. The study involved five alternatives (cultivars) and five different criteria regarding morphological parameters (rosette height, rosette diameter, rosette fresh weight, number of leaves, and stem height). Weight coefficients were determined using the AHP (Analytic Hierarchy Process) method while the stability of the obtained ranking list was determined by applying sensitive analysis through six scenarios. According to the selected criteria, the obtained results showed that the green cultivar 'Tourbillon' has the best results, while the least favorable results were obtained by the red cultivar 'Carmesi'. Furthermore, this study tends to facilitate cultivar selection by farmers to avoid economic losses and sustain the required quantity and quality standard demands for the fresh product and food industry market.

Five lettuce cultivars ('Kiribati', 'Tourbillon', 'Carmesi', 'Lianabel', and 'Biondonna') were grown in the open-field experiment during the summer of 2018. The aim was to find the optimal summer lettuce cultivar according to morphological and production parameters, suitable for the fresh market and food industry processing by applying the MABAC (Multi-Attributive Border Approximation Area Comparison) method. The correlation analysis was carried out to reduce the number of criteria that have high coefficient values and a double influence on the ranking results. The study involved five alternatives (cultivars) and five different criteria regarding morphological parameters (rosette height, rosette diameter, rosette fresh weight, number of leaves, and stem height). Weight coefficients were determined using the AHP (Analytic Hierarchy Process) method while the stability of the obtained ranking list was determined by applying sensitive analysis through six scenarios. According to the selected criteria, the obtained results showed that the green cultivar 'Tourbillon' has the best results, while the least favorable results were obtained by the red cultivar 'Carmesi'. Furthermore, this study tends to facilitate cultivar selection by farmers to avoid economic losses and sustain the required quantity and quality standard demands for the fresh product and food industry market.

The main goal of our study was to find an optimal combination of tested factors to achieve lettuce rich in bioactive compounds sustaining its pleasant taste. We examined three red and three green cultivars in a greenhouse using two microbiological fertilisers (EM Aktiv and Vital Tricho), and their combination. Plants were grown in three consecutive growing seasons (autumn, winter, and spring). Lactones accumulated in autumn, whereas phenolics’ concentration rose during winter. Red cultivars showed higher phenolics and lactone content, where chicoric acid and luteolin-7-glucoside were the most abundant in the ‘Gaugin’ winter trial. Lactucopicrin was the predominant lactone among tested cultivars with the highest value in the red cultivar ‘Carmesi’. Solely applicated, the fertiliser EM Aktiv and Vital Tricho led to significantly higher phenolic acid and dihydrolactucopicrin content, while combined, there were notably increased levels of all detected lactones. Application of single fertilisers had no effect on flavonoid content, while the combination even reduced it. A sensory analysis showed a negative correlation between overall taste and total sesquiterpene lactones,lactucopicrin, caffeoylmalic, and chlorogenic acid, indicating a less bitter taste with decreasing content of these compounds. Our findings indicate that the cultivar, fertiliser, and growing season jointly affected all of the tested parameters, highlighting the differences in the application of EM Aktiv, Vital Tricho, and their combination.

Salata (Lactuca sativa L.) je jednogodišnja biljka, sa umerenimzahtevima prema faktorima spoljašnje sredine, kratkim vegetacionimperiodom i mogućnošću gajenja tokom cele godine. Ogledi sa šestgenotipova salate (‘Kiribati’, ‘Murai’, ‘Aquino’, ‘Gaugin’, ‘Aleppo’,‘Carmesi’) bili su postavljeni u kompaniji Iceberg Salat Centar. Biljke sugajene u plasteniku, bez dodatnog grejanja, tokom tri uzastopne sezone(jesen, zima i proleće), primenom mikrobioloških đubriva (EM Aktiv,Vital Tricho i njihova kombinacija). Cilj ovog istraživanja je bio da seutvrdi uticaj genotipa, mikrobioloških đubriva i sezone na sadržaj ukupnorastvorljivih materija i organskih kiselina. Najveću vrednost ukupnorastvorljivih materija i organskih kiselina ostvarila je crvena sorta ‘Murai‘u zimskom ogledu primenom đubriva Vital Tricho i EM Aktiv redom.Primena đubriva uglavnom nije uticala na vrednosti ukupno rastvorljivihmaterija i organskih kiselina, gde je tokom svih sezona sadržaj ostaostabilan. Istraživanje je pokazalo da su glavni faktori uticali naposmatrane parametre, sa izraženim uticajem genotipa., Lettuce (Lactuca sativa L.) is an annual plant, with moderate requirements to environmental factors, short vegetation period and the possibility to cultivate throughout whole year. Trials with six lettuce cultivars (‘Kiribati’, ‘Murai’, ‘Aquino’, ‘Gaugin’, ‘Aleppo’, ‘Carmesi’) were set up in the company Iceberg Salat Centar. The plants were grown in a greenhouse, without additional heating, during three consecutive seasons (autumn, winter and spring), using microbiological fertilisers (EM Aktiv, Vital Tricho and their combination). The aim of this study was to determine the influence of genotype, microbiological fertilisers and season on the content of total soluble solids and organic acids. The highest value of total soluble solids and organic acids showed red cultivar 'Murai' in the winter trial using fertilisers Vital Tricho and EM Aktiv, respectively. Application of fertilisers generally did not affect the values of total soluble solids and organic acids, whereas the content remained stable during all seasons. The research showed that the main factors influenced tested parameters, with a great impact of the genotype.

The principal sesquiterpene lactones (lactucin, lactucopicrin, and its dihydro forms), known as contributors to bitter taste, were measured in green and red coloured lettuce using Ultra-performance liquid chromatography. Six lettuce cultivars (‘Kiribati’, ‘Murai’, ‘Aquino’, ‘Gaugin’, ‘Aleppo’ and ‘Carmesi’) were grown in a greenhouse experiment using microbiological fertilisers (EM Aktiv, Vital Tricho, and their combination) during three successive growing seasons (autumn, winter, and spring). The major sesquiterpene lactone was lactucopicrin with the highest level found in cultivar ‘Carmesi’ (0.65 mg/g dry weight) in autumn with the combination of fertilisers. The concentrations of lactucin, dihydrolactucin and dihydrolactucopicrin ranged from 0.001-0.085, 0.003-0.015, and 0.001-0.056 mg/g dry weight, respectively, and were not found in all lettuce samples. Generally, red cultivars showed higher content of lactones compared to green. Application of Vital Tricho and the combination of fertilisers led to an increased level of lactucopicrin, in some cultivars, in the range of 77-800% compared to unfertilised plants. Higher levels of lactucopicrin were found in the autumn trial compared to spring and winter. The present study suggests that genotype, fertilisers and season jointly affected the quantity of sesquiterpene lactones with emphasis on Vital Tricho, and/or the combination of fertilisers.

Cabbage is one of the most important vegetables from Brassicaceae family to which biofertilisers is increasingly applied following the current trend in the cabbage organic farming. The main goal of our study was to examine whether solely applicated biofertilisers enhance head weight and other morphological parameters in cabbage. Experiment with three Bejo Zaden cultivars ('Farao' F1, 'Tiara' F1, and 'Excalibur' F1) were conducted under the open field conditions from April to June 2019. Two different microbiological fertilisers, Organic balance and FitoHelp, were applied foliar, six times during the vegetation period, with a battery sprayer. After harvest, several parameters were estimated: head weight, width and height, number of leaves, internal core height and width. The results showed the highest value of head weight (1264.89 g), head width (15.06 cm), head height (15.57 cm), number of leaves (22.56), internal core height (8.01 cm) and internal core width (3.51 cm) in cultivar 'Excalibur' F1 compared to other two cultivars for fresh market. Application of both fertilisers led to increased levels of all tested parameters compared to control. Furthermore, fertiliser Organic balance showed the highest impact on all tested parameters, resulting in increasing value of head weight by 78.6%. This study revealed that mixed culture fertiliser showed greater impact in terms of head weight, number of leaves, and internal core width compared to fertiliser containing a single strain of bacteria. Accordingly, with an exception in head and internal core height, all examined factors showed statistically significant impact on tested parameters, including their interaction.

Cabbage is one of the most important vegetables from the Brassicaceae family to which biofertilisers are increasingly applied following the current trend in cabbage organic farming. The main goal of our study was to examine whether solely applicated biofertilisers enhance head weight and other morphological parameters in cabbage. Experiment with three Bejo Zaden cultivars ('Farao' F 1 , 'Tiara' F 1 , and 'Excalibur' F 1 ) were conducted under the open field conditions from April to June 2019. Two different microbiological fertilisers, Organic balance and FitoHelp, were applied foliar, six times during the vegetation period, with a battery sprayer. After harvest, several parameters were estimated: head weight, width and height, number of leaves, internal core height and width. The results showed the highest value of head weight (1264.89 g), head width (15.06 cm), head height (15.57 cm), number of leaves (22.56), internal core height (8.01 cm) and internal core width (3.51 cm) in cultivar 'Excalibur' F1 compared to other two cultivars for fresh market. Application of both fertilisers led to increased levels of all tested parameters compared to the control. Furthermore, fertiliser Organic balance showed the highest impact on all tested parameters, resulting in an increasing value of head weight by 78.6%. This study revealed that mixed culture fertiliser showed a greater impact in terms of head weight, number of leaves, and internal core width compared to fertiliser containing a single strain of bacteria. Accordingly, with an exception in head and internal core height, all examined factors showed a statistically significant impact on tested parameters, including their interaction.

The production of lettuce is very profitable due to the short vegetation period and the possibilities of its cultivation throughout the year. On average, the salad contains 94% water, 2% sugar, 0.6% crude cellulose, 0.6% mineral matter and 1.2% crude protein. It is rich in vitamins C, B1 and B2, and many mineral elements. Great influence on the quantitative and qualitative properties of lettuce in addition to the variety and production conditions has a proper diet. The application of mineral fertilizers results in high yields, but their inadequate application can cause various problems such are: decrease in dry matter content, deterioration of salad quality, increase in soil acidity, degeneration of physical properties, increase in erosion and instability in land aggregates. In order to reduce the use of chemicals and increase the yield in the same time, the improvement of plant production is moving in the direction of introducing biofertilizers. In recent years there has been a trend of decreasing the usage of mineral nutrients, primarily nitrogen, phosphorus and potassium (Haytova, 2013), in which bio stimulators play a significant role. Therefore, the goal was to determine the impact of biofertilizers on the yield and quality of lettuce and to investigate the possibility of streamlining the crop by using biostimulators in lettuce nutrition. The two-factor experiment was set on a private plot in district Vranjes, East Sarajevo by using the randomized block in 3 replications. The highest yield of lettuce was obtained in the variant with the application of the biofertilizer Bioplant flora (630.50 g – please state the unit), whereas the lowest was recorded in the control variant of fertilization (468.00 g). The highest percentage of dry matter was noted in the third variant of fertilization (Bioplant flora) in the variety Majska kraljica (6.45%), whilst the lowest percentage was reached in the control variant of the same variety (4.14%).

The production of lettuce is very profitable due to the short vegetation period and the possibilities of its cultivation throughout the year. On average, the salad contains 94% water, 2% sugar, 0.6% crude cellulose, 0.6% mineral matter and 1.2% crude protein. It is rich in vitamins C, B1 and B2, and many mineral elements. Great influence on the quantitative and qualitative properties of lettuce in addition to the variety and production conditions has a proper diet. The application of mineral fertilizers results in high yields, but their inadequate application can cause various problems such are: decrease in dry matter content, deterioration of salad quality, increase in soil acidity, degeneration of physical properties, increase in erosion and instability in land aggregates. In order to reduce the use of chemicals and increase the yield in the same time, the improvement of plant production is moving in the direction of introducing biofertilizers. In recent years there has been a trend of decreasing the usage of mineral nutrients, primarily nitrogen, phosphorus and potassium (Haytova, 2013), in which bio stimulators play a significant role. Therefore, the goal was to determine the impact of biofertilizers on the yield and quality of lettuce and to investigate the possibility of streamlining the crop by using biostimulators in lettuce nutrition. The two-factor experiment was set on a private plot in district Vranjes, East Sarajevo by using the randomized block in 3 replications. The highest yield of lettuce was obtained in the variant with the application of the biofertilizer Bioplant flora (630.50 g – please state the unit), whereas the lowest was recorded in the control variant of fertilization (468.00 g). The highest percentage of dry matter was noted in the third variant of fertilization (Bioplant flora) in the variety Majska kraljica (6.45%), whilst the lowest percentage was reached in the control variant of the same variety (4.14%).

The paper presents a short history of archaeometry investigations in Serbia, from the first published work in 1932 until today. It then describes the most important laboratories and institutions that perform archaeometry investigations in Serbia today, their teams, equipment, projects, and cooperation: Institute for the Protection of Cultural Monuments of Serbia, Vinča Institute of Nuclear Sciences, Faculty of Physical Chemistry, National Museum of Serbia, Institute of Archaeology, the Heritage Lab, Gallery of Matica Srpska Novi Sad, and City Museum of Subotica. The paper describes plans for the future and proposes forming of Serbian Society for Archaeometry with several goals: to further interconnect research disciplines; to facilitate better use and purchase of equipment, to establish a dedicated laboratory for archaeometry; to introduce archaeometry study programs at different levels of teaching; to introduce archaeometry into scientific plans of Serbia; to start a domestic archaeometry journal, and to promote the awareness of the potentials and benefits of archaeometry to institutions dealing with cultural heritage and to the general public.

It is known that we can always 3-triangulate (i.e. divide into tetrahedra with the original vertices) convex polyhedra but not always non-convex ones. Polyhedra topologically equivalent to ball with p handles, shortly p-toroids, cannot be convex. So, it is interesting to investigate possibilities and properties of their 3-triangulations. Here we study the minimal number of necessary tetrahedra for the triangulation of a 3-triangulable p-toroid. For that purpose, we developed the concept of piecewise convex polyhedron and that of its connection graph.

Supergroups of some hyperbolic space groups are classified as a continuation of our former works. Fundamental domains will be integer parts of truncated tetrahedra belonging to families F1 -F4, for a while, by the notation of E. Molna ' r et al. in 2006. Our paper relies basically on this work. As an application, optimal congruent hyperball packings and coverings to the truncation base planes with their very good densities are computed. This covering density is better than the conjecture of L. Fejes To ' th for balls and horoballs in 1964.