Boron application in red clover (Trifolium pratense L.) seed production

peer-reviewedThis work is part of the research project TR-31016, funded by the Ministry of Science and Technological Development, Republic of Serbia.A field trial with four red clover cultivars was established on acid soil in order to evaluate the effect of foliar boron application on seed yield. The crop received foliar boron treatment during the second growth of the second year at two applications. Although seed yield showed a significant increase in boron-treated plants in 2011 compared with control (26.0%), its relative increase was far higher in 2010 (43.2%), which had increased total rainfall amounts during flowering. Sufficient level of boron supply to red clover plants for seed production has a remarkably positive effect under conditions hampering pollination and fertilisation.Ministry of Science and Technological Development, Republic of Serbi

XPS Investigations of Ruthenium Deposited onto Representative Inner Surfaces of Nuclear Reactor Containment Buildings

International audienceIn the case of a hypothetical severe accident in a nuclear power plant, interactions of gaseous RuO4 with reactor containment building surfaces (stainless steel and epoxy paint) could possibly lead to a black Ru-containing deposit on these surfaces. Some scenarios include the possibility of formation of highly radiotoxic RuO4(g) by the interactions of these deposits with the oxidising medium induced by air radiolysis, in the reactor containment building, and consequently dispersion of this species. Therefore, the accurate determination of the chemical nature of ruthenium in the deposits is of the high importance for safety studies. An experiment was designed to model the interactions of RuO4(g) with samples of stainless steel and of steel covered with epoxy paint. Then, these deposits have been carefully characterised by scanning electron microscopy (SEM/EDS), electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS). The analysis by XPS of Ru deposits formed by interaction of RuO4(g), revealed that the ruthenium is likely to be in the IV oxidation state, as the shapes of the Ru3d core levels are very similar with those observed on the RuO2,xH2O reference powder sample. The analysis of O1s peaks indicates a large component attributed to the hydroxyl functional groups. From these results, it was concluded that Ru was present on the surface of the deposits as an oxyhydroxide of Ru(IV). It has also to be pointed out that the presence of “pure” RuO2, or of a thin layer of RuO3 or Ru2O5, coming from the decomposition of RuO4 on the surface of samples of stainless steel and epoxy paint, could be ruled out. These findings will be used for further investigations of the possible revolatilisation phenomena induced by ozone

De l’égalité problématique aux mariages utiles

Partage égalitaire, dualisme politique et système d’alliance battent ensemble au rythme d’un double mouvement d’ouverture/fermeture. Le régime égalitaire implique la circulation des terres dans la communauté alors que chaque famille nucléaire reconstruit son exploitation privée. Le dualisme génère une alternance, tandis que chaque clan lutte pour conserver le pouvoir communal. Des familles entretiennent les alliances matrimoniales extérieures cependant que d’autres renforcent les liens communautaires. En définitive, une philosophie égalitaire constituerait la clé de voûte de ce système social.From Problematical Equality to Useful Marriages. Kinship and Affinity in a Kindred-Based Society (Mase, The Swiss Alps). – Egalitarian sharing, political dualism and the marriage system work together in an opening/closing movement. Egalitarianism implies that land circulates in the community, but each nuclear family reassembles its private landholdings. Dualism causes alternations, but each clan struggles to keep its power in the commune. Some marital alliances occur outside the community, but others inside, thus reinforcing community bonds. Ultimately, this social system’s cornerstone is an egalitarian philosophy

UPOTREBNA VREDNOST RAZLIČITIH ŽITARICA ZA ISHRANU ŠARANSKIH RIBA (CYPRINIDAE)

Wheat and corn are main source of carbohydrates in the human and domestic animals diet. Growing need for the production of quality proteins dictates the use of other cereals for this purpose. Cyprinids (Cyprinidae) are the most common fish in world aquaculture. In the numerous experiments were performed with the replacement of wheat and corn with other cereals in feed mixtures for these species. It has been established that the value of cereals for this purpose can be ranked: wheat > triticale > corn > barley > rye > sorghum > millet.Publishe

Validity and Reliability of a New Specific Parkour Test : Physiological and Performance Responses

Main aim of this study was examining validity and reliability of using a new specific Parkour repeated sprint ability test (SPRSA) for assessing repeated sprint ability while facing obstacles and establishing between-day reliability and sensitivity of SPRSA related to its physiological and performance responses. Thirteen high-level traceurs (three females) performed in random order and twice eight tests for assessing a total of 23 variables: SPRSA (a typical maximal-speed shuttle run interspersed with four Parkour competition-common fundamentals) and seven established fitness tests, core stability, hand-grip, vertical-jump, long-jump, pull-up, 300-m shuttle run (as a field test for anaerobic capacity), and Leger test. Except for muscular elasticity index of vertical jump test (intra-class Correlation Coefficient model 3,1 [ICC3,1] = 0.54 [fair]), fitness tests' ICC3,1s resulted excellent (ICC3,1: 0.93-1.00). SPRSA total time and time of its fastest sprint (SPRSA peak time) were significantly correlated with the majority of core stability (r: -0.79 to 0.59; P < 0.01-0.05), jumping (r: -0.78 to 0.67; P < 0.01-0.05), pull-up tests (r: -0.86; P < 0.01), 300-m shuttle run test total time (r: 0.77-0.82; P < 0.01), and Leger test-estimated VO2 max (r: -0.78; P < 0.01). Principal component analysis (PCA) of the 23 variables led to extraction of four significant components (each due to different variables' combinations), which explained 90.2% of 23 variables' total variance. SPRSA (i.e., total and peak time) showed high reliability (ICC3,1: 0.991-0.998 and standard-error-of-measurement %: 0.07-0.32). Finally, SPRSA showed high sensitivity (smallest-worthwhile-change %: 0.29-0.68). Considering its excellent logical and strong ecological validity, SPRSA may serve as a valid specific field test for Parkour sport. In addition, thanks to its high reliability and sensitivity, this test is suitable for monitoring, evaluating, and programming training processes for Parkour practitioners in repeated sprint ability involving crossing obstacles

Uticaj vremenskih uslova na prinos i komponente prinosa jarog pivskog ječma

A field trial with four cultivars of two-rowed spring barley was set up at the experimental field of the Secondary School of Agriculture, Požarevac, during 2012-2014 to evaluate yield and grain yield components under different growing seasons. Cultivars were sown at 450 germinating grains m-2. At tillering, the plants were fertilised with 60 kg nitrogen ha-1. The tested properties were significantly affected by weather conditions during the growing season, with different effects produced across cultivars. The values for grain yield, thousand-kernel weight, grain weight per spike, kernels per spike and plant height were highest in all cultivars in the year characterised by moderate temperatures at the grain filling stage and high amounts of precipitation in the second part of the growing season. 'Novosadski 448' exhibited the highest values for grain yield, kernels per spike and grain weight per spike.Poljski ogledi sa četiri sorte jarog dvoredog ječma postavljeni su na imanju Poljoprivredne škole u Požarevcu u periodu 2012-2014. godine, sa ciljem da se analizira prinos i komponente prinosa zrna u različitim vegetacionim sezonama. Sorte su zasejane sa 450 klijavih zrna m-2. U fazi bokorenja izvršena je prihrana sa 60 kg ha-1 azota. Na vrednosti analiziranih osobina značajno su uticali vremenski uslovi tokom perioda vegetacije, pri čemu je njihov uticaj kod pojedinih sorti bio različit. Najveći prinos zrna, masa 1000 zrna, masa zrna po klasu, broj zrna po klasu i visina biljaka bili su kod svih sorti u godini sa umerenim temperaturama u vreme nalivanja zrna i velikom količinom padavina u drugom delu vegetacione sezone. Sorta Novosadski 448 imala je najveći prinos zrna, najveći broj zrna po klasu i najveću masu zrna po klasu

UNAPREĐENJE PROIZVODNJE STOČNE HRANE NA PRIRODNIM TRAVNJACIMA

Yield and quality of forage mainly depend on the floristic composition, ie the share of higher quality grasses and legumes, soil fertility, amount and distribution of precipitation and light. Natural meadows and pastures are the most important resource in the forage production in the hilly and mountainous area of Republic of Serbia. Despite the large areas, the forage production on natural grasslands is relatively low. Limited application of a small number of agrotechnical measures is the main reason for low and unstable yields and poor forage quality. Only by appropriate fertilization of meadows and pastures with mineral and organic fertilizers, their rational exploitation, it is possible to achieve an increase in hay yield by several times and improvement in forage quality, simultaneously.Publishe