ASSESSMENT OF THIGH MUSCLES MECHANICAL CAPACITIES FOLLOWING ACL RECONSTRUCTION USING THE TWO-VELOCITY METHOD

We evaluated the ability of recently proposed two-velocity method to discriminate between thigh muscle mechanical capacities of the involved and the uninvolved leg following ACL reconstruction (ACLR). 15 athletes were tested 4 and 6 months following ACLR. F-V linear relationship parameters (F intercept - F0, V intercept - V0, slope – a, and Pmax) were obtained from line drawn through 60 and 180 °/s data (the \u27two-velocity method\u27). In quadriceps, all parameters revealed between leg differences 4 and 6 months after ACLR. In addition F0 and V0 of the involved leg were higher at 6 than at 4 months after ACLR. In hamstrings, differences between legs were found only for F0 at 4 months. In conclusion, parameter of the two-velocity method could be sensitive enough to detect between-leg differences in muscle F, V, and P producing capacities following ACLR

Combining abilities for spike traits in a diallel cross of barley

Five two-row winter barley (Hordeum vulgare L.) cultivars divergent in spike traits were crossed in all possible combinations excluding reciprocals to produce 10 F1 and F2 hybrids for analysis of combining abilities. The analysis of variance of combining abilities showed significant differences for GCA and SCA in F1 hybrids and F2 generation, suggesting additive and non-additive gene action. The GCA/SCA ratio in F1 and F2 indicated the prevalence of the additive component of genetic variance for spike length, grain weight per spike and spike harvest index. By contrast, the SCA variance for grain weight per spike was higher than the GCA variance, indicating the dominance of non-additive gene action. Good GCAs were found in parents having high values for spike length (Djerdap, NS-293), grain number per spike (Vada, Jagodinac), grain weight per spike (Vada, NS-293) and spike harvest index (Djerdap, Jagodinac). None of the parents had good GCA for all traits, suggesting a potential increase in combining abilities for spike traits. The best SCA were obtained mostly from crosses between parents having high x low, high x high or average x low GCA values. Parents having high GCA values may be used to produce improved lines in hybridisation programmes. Combinations with high SCA values may yield good segregating lines in further selection programmes

Prinos sorti žutog zvezdana na zemljištu bazne reakcije

The aim of the study was to analyze the forage and seed yield of birdsfoot trefoil cultivars on the soil base reaction. The field trial was set 2014th in Čačak on soil type fluvisol (pHH2O 7.8). The experiment was set a randomized complete block design with three replications with a plot size of 6x1m. The birdsfoot trefoil cultivars K-37, Zora and Bull were planted at a row spacing of 12.5 cm and a seeding rate of 10 kg ha-1. Cultivars among themselves, did not differ significantly in terms of forage yield, hay yield and dry matter content. The average forage yield in the first cut in the second year of cultivation was 26.53 t ha-1. The forage yield in the first cut in the third year of cultivation was 26.56 t ha-1 and in the second cut 11.77 t ha-1. The average seed yield of cultivars in the second growth in the second year of cultivation was 472.3 kg ha-1. Birdsfoot trefoil cultivars among themselves, did not differ significantly in terms of seed yield components. However, Zora cultivar had significantly higher seed yield potential, compared to other cultivars. These results do not differ from results obtained under similar conditions on acid soil.Cilj istraživanja je bio da se analizira prinos krme i semena sorti žutog zvezdana na zemljištu bazne reakcije. Ogled je postavljen 2014. godine u Čačku na zemljištu tipa fluvisol (pHH2O 7,8). Poljski eksperiment je postavljen po potpuno slučajnom blok sistemu u tri ponavljanja, sa veličinom elementarne parcele 6x1m. Sorte žutog zvezdana K-37, zora i Bull su zasejane na rastojanju 12,5 cm međuredno, sa količinom semena 10 kg ha-1. Sorte se među sobom nisu značajno razlikovale u pogledu prinosa krme, prinosa sena i sadržaja suve materije. Prosečan prinos krme u prvom otkosu u drugoj godini proizvodnje je bio 26,53 t ha-1. Prinos krme u prvom otkosu u trećoj godini proizvodnje je bio 26,56 t ha-1, a u drugom otkosu 11,77 t ha-1. Prosečan prinos semena sorti u drugom porastu u drugoj godini gajenja je bio 472,3 kg ha-1. Sorte žutog zvezdana se među sobom nisu značajno razlikovale u pogledu komponenti prinosa semena. Međutim, sorta zora je imala značajno veći potencijalni prinos semena u odnosu na ostale sorte. Navedeni rezultati se ne razlikuju od rezultata dobijenih u sličnim uslovima na kiselom zemljišu

Prinos i komponente prinosa zrna ozimog dvoredog ječma gajenog na kiselom zemljištu

A field trial was set up to analyse the effect of mineral fertilisation and liming on grain yield and yield components of barley on an acidic soil. Research was conducted over a period of two years at the experimental field of the Secondary School of Agriculture, Kraljevo. The trial involved three cultivars of two-row winter barley and four fertilisation treatments (no fertilisation, different ratios of N:P:K, with or without liming). Mineral fertilisation and liming led to a significant increase in the number of grains per spike and grain weight per spike, thereby resulting in significantly higher grain yields under fertilised treatments. Grain yield increased more significantly by liming than by increased rates of P, which was likely due to greater availability of macro- and micronutrients at increased soil pH. If economically worthwhile, liming should be used in barley production on very acidic soils to increase pH above suboptimal levels (pH 5.0). This would facilitate and enhance the realisation of grain yield potential in barley.Poljski ogled postavljen je sa ciljem da se analizira uticaj mineralnih đubriva i kalcizacije na prinos i komponente prinosa zrna ječma na kiselom zemljištu. Istraživanja su obavljena u dvogodišnjem periodu na oglednom polju Srednje poljoprivredne škole u Kraljevu. Za ogled su odabrane tri sorte ozimog dvoredog ječma i četiri varijante đubrenja (bez đubrenja, različiti odnosi N:P:K, sa ili bez kalcizacije). Primena mineralnih đubriva i kalcizacija uticali su na značajno povećanje broja i mase zrna po klasu, tako da je i prinos zrna svih sorti bio značajno veći na đubrenim varijantama. Na povećanje prinosa zrna ječma u većoj meri je uticala primena kalcizacije zemljišta u odnosu na povećane količine P, što se može povezati sa većom dostupnošću xmakro i mikroelemenata pri povećanju pH vrednosti zemljišta. Ukoliko je ekonomski prihvatljiva kalcizaciju bi trebalo primenjivati u gajenju ječma na jako kiselim zemljištima kako bi se pH vrednost povećala iznad nivoa suboptimalne (pH 5,0). Na taj način bi se u većoj meri realizovao njegov potencijal za prinos zrna

REMOVAL OF THE FALSE TARGETS IN THE ISSUESOF SPATIAL TRIANGULATION BY PROJECTIVE GEOMETRY METHODS

This paper deals with an issue of determination of the spatial coordinates within confined area in general terms. Mobile air space control stations were set and related to the system of spa- tial triangulation. As a result of the air space "scanning", targets appear in adequate representa- tion, representing identified aircrafts and other flying objects (FOs). The main objective is inter- pretation of collected data processing, in order to determine the reliable coordinates of an air- craft. The problem of false target identification occurs when data are analyzed from only two sta- tions. Descriptive Geometry method, for the construction of the planes containing rays targeted from the station towards the flying objects, in both classic-orthogonal projections and 3D model, as well, offers the solution of a problem. Dynamic 3D model consists of two flying objects, moni- tored from two stations in predefined time periods. The constructive 3D solutions represent geo- metrical locus of false targets trajectories, for several settings of flaying objects and monitoring stations. The analyses have shown geometrical positioning of the third station impact to the exact FO's coordinates determination. The geometrical solution could be the key for the development of numerical method, which will lead to applied software solutio

Uticaj folijarne primene tečnog organskog đubriva na prinos i komponente prinosa semena crvene deteline na kiselom zemljištu

The field experiment with varieties of red clover K-39 and Amos, was set up on alluvial soil type using a randomized block design with three replications and plot size 5x1m. The aim was to analyze the effect of foliar application of liquid organic fertilizer (Bioplant flora, Plant DOO, Russia) on seed yield and yield components of red clover in the conditions of dense planting. Regardless of foliar application of liquid fertilizer, cultivar K-39 had a significantly higher number of inflorescences per stem, number of inflorescences m-2, seed number per inflorescence, fertility of flowers and seed yield. Foliar application of liquid fertilizer resulted in a significant increase in the value of yield components, especially fertility and the number of flowers per inflorescence in cultivar K-39.Poljski ogled sa sortama crvene deteline K-39 i Amos, postavljen je na zemljištu tipa aluvijum po potpuno slučajnom blok sistemu u tri ponavljanja i veličinom elementarne parcele 5x1m. Cilj rada bio je da se analizira uticaj folijarne primene tečniog organskog đubriva (Bioplant flora, Plant DOO, Rusija) na komponente prinosa i prinos semena crvene deteline u uslovima guste setve. Nezavisno od folijarne primene tečnog organskog đubriva, sorta K-39 je imala značajno veći broj cvasti po izdanku, broj cvasti m-2, broj zrna po cvasti, značajno veću fertilnost cvetova i prinos semena u odnosu na sortu Amos. Folijarna primena tečnog organskog đubriva uticala je na značajno povećanje vrednosti komponenti prinosa, a pre svega fertilnosti cvetova i broja zrna po cvasti kod sorte K-39

Uticaj navodnjavanja na intenzitet pojave Venturia Inaequalis kod jabuke

The highest intensity of V. Inaequalis attack on apple leaf was noted in the control variant without application of fungicide. In the variant with pre-irrigation soil moisture, 80% of PVK was 26% and gradually decreased to control irrigation without irrigation (20%). The lowest infestation intensity was on the control variant without irrigation (0.6%), where treatment with the fungicide Score was performed. The largest percentage of the intensity of attack by V. Inaequalis on apple fruit was on the variant without chemical protection (6.2%), where pre-irrigation soil moisture was maintained at 80% of PVK. In all variants with chemical protection in irrigation conditions there was a low intensity of attack by V. Inaequalis (0.1-0.5%).Najveći intenzitet napada V. Inaequalis na lišću jabuke zabeležen je na kontrolnoj varijanti bez primene fungicida. Na kontrolnoj varijanti sa predzalivnom vlažnošću zemljišta 80% od PVK procenat zaraze bio je 26% i postepeno opadao ka kontrolnoj varijanti bez navodnjavanja (20%). Najmanji intenzitet zaraze je bio na kontrolnoj varijanti bez navodnjavanja (0,6%), gde je obavljen tretman sa fungicidom Score. Najveći procenat intenziteta napada V. Inaequalis na plodu jabuke bio je na varijanti bez hemijske zaštite (6,2%), gde je održavana predzalivna vlažnost zemljišta 80% od PVK. Na svim varijantama sa hemijskom zaštitom u uslovima navodnjavanja ostvaren je nizak intenzitet napada V. Inaequalis (0,1-0,5%)

Asymmetries in explosive strength following anterior cruciate ligament reconstruction

Background: Despite its apparent functional importance, there is a general lack of data regarding the time-related changes in explosive strength and the corresponding side-to-side asymmetries in individuals recovering from an ACL reconstruction (ACLR). The present study was designed to assess changes in the maximum and explosive strength of the quadriceps and hamstring muscles in athletes recovering from an ACLR. Methods: Twenty male athletes with an ACL injury completed a standard isometric testing protocol pre-ACLR, four and six months post-ACLR. In addition to the maximum strength (F-max), the explosive strength of quadriceps and hamstrings was assessed through four variables derived from the slope of the force-time curves over various time intervals (REDmax, RED50, RFD150 and RED250). Side-to-side asymmetries were calculated relative to post-ACLR measures of the uninvolved leg ("standard" asymmetries), and relative to pre-ACLR value of the uninvolved leg ("real" asymmetries). Results: Pre-ACLR asymmetries in quadriceps RFD (average 26%) were already larger than in F-max (14%) (p lt 0.05). Six months post-ACLR real asymmetries in RFD variables (33-39%) were larger than the corresponding standard asymmetries (26-28%; p lt 0.01). Average asymmetries in hamstrings' RFD and F-max were 10%, 25% and 15% for pre-ACLR and two post-ACLR sessions, respectively (all p gt 0.05). Conclusions: In addition to the maximum strength, the indices of explosive strength should also be included in monitoring recovery of muscle function following an ACLR. Furthermore, pre-injury/reconstruction values should be used for the post-ACLR side-to-side comparisons, providing a more valid criterion regarding the muscle recovery and readiness for a return to sports