12 research outputs found

    THE SHARE OF THE IRRIGATION AND FERTILIZERS APPLICATION IN GRAIN YIELD BUILDING IN 500-600 MATURITY GROUP CORN

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    Eksperiment je izveden u ekoloÅ”kim uvjetima Zemun Polja u toku 1976. 1977. i 1978. godine, na slabo karbonatnom černozemu. ZemljiÅ”te je dobrih fizičkih, kemijskih i mikrobioloÅ”kih osobina. Eksperiment je bio postavljen po metodi razdjeljenih parcela (Split-plot), kao trofaktorijalni u tri ponavljanja. Prvi faktor je bila voda: Vā‚ Kontrola (bez navodnjavanja) ; Vā‚‚ Navodnjavanje umjetnom kiÅ”om. Vrijeme zalijevanja utvrđivano je na osnovu praćenja i gravitmetrijskog određivanja sadržaja vode u zemljiÅ”nom sloju od 70 cm u intervalu od 7 dana. Navodnjavanjem je održavana vlažnost ovog zemljiÅ”nog sloja na nivu 70% od O.K.K. Drugi faktor je bilo gnojenje: Gā‚ Kontrola (bez gnojenja) Gā‚‚ Gnojenje sa N-160 kg/ha, Pā‚‚Oā‚… - 110 kg/ha i Kā‚‚O ā€“ 64 kg/ha. Cijelokupna količina PK hraniva dana je u jesen prilikom duboke obrade zemljiÅ”ta. Jedna polovina duÅ”ićnih gnojiva dana je pred predsjetvenu pripremu zemljiÅ”ta a ostali dio je dan prilikom prihranjivanja. Treći faktor bili su hibridi FAO grupe zrenja 500-600 čija je dužina vegetacije oko 130 dana: Hā‚ ZP SC 46A, Hā‚‚ ZP SC 48A, Hā‚ƒ ZP SC 58C, Hā‚„ ZP SC 55. Na osnovu trogodiÅ”njih rezultata proučavanja uloge vode i gnojiva na formiranje prinosa kukuruza, može se zaključiti: Vodni režim zemljiÅ”ta po proučavanim godinama i fazama porasta kukuruza bio je neujednačen, te su intervencije s navodnjavanjem uslijedile po različitim fazama. U svakoj godini bila su primjenjena po dva zalijevanja. Norme zalijevanja kretale su se od 400 do 700 mĀ³ vode po hektaru, a norme navodnjavanja od 900 mĀ³/ha u 1978. godini do 1100 mĀ³/ha u 1977.godini. Proučavani faktori nisu imali značajnijeg utjecaja na debljinu klipa, broj redova na klipu i postotak oklaska, dok se na dužinu klipa ispoljio utjecaj navodnjavanja i gnojenja. Obezbjeđenost kukuruza vodom i hranivima imala je utjecaja na smanjenje postotka jalovih biljaka, dok se na postotak poleglih biljaka taj utjecaj nije ispoljio. Također, proučavani faktori imali su značajnijeg utjecaja na težinu zrna po klipu i težinu 1000 zrna. Ostvareni prinosi pokazali su da su bili u određenom stupnju uslovljeni gnojenjem, navodnjavanjem i hibridom. Kombinacija s gnojenjenjem i navodnjavanjem dala je za 36,6% veći prinos od kombinacije koja je bila bez gnojenja i bez navodnjavanja. Također, ova kombinacija dala je i ujednaćeniji prinos, tijekom proučavanih godina. Navodnjavanje je u prosijeku doprinijelo povećanju prinosa za 13,85%, a gnojenje za 23,76%

    Comparative analysis of characteristics of passenger car tires in Serbia

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    U radu su predstavljeni rezultati istraživanja stanja i karakteristika pneumatika koji se voze u Srbiji. Prikupljeni su podaci o pohabanosti dezena, dimenzijama, starosti, marki, tipu viÅ”e od 700 pneumatika kao i podaci o vozilima na kojima su montirani. Osnovni zaključak je da je stanje pneumatika dobro, odnosno znatno bolje nego Å”to je sanje voznog parka u Srbiji. Prosečna izmerena dubina Å”are protektora bila je oko 5 mm, a prosečna starost kontrolisanih pneumatika oko 3 godine. Značajan deo pregledanih vozila bio je opremljen zimskim pneumaticima. Prva istraživanja (Beograd, novembar 2009) o koriŔćenju zimskih dala su dobre rezultate sa oko 25% automobila opremljenih sa takvim gumama. Tokom drugog istraživanja (Beograd, juli 2010) uočen je pad od oko 5%. U Užicu, gde su sprovedena istraživanja u novembru 2010 godine utvrđeno je da se taj procenat popeo na 50%. Struktura i starost voznog parka u Srbiji su ocenjeni kao nezadovoljavajući. Sa sadaÅ”njim stepenom obnove voznog parka, takvo stanje će se veoma polako menjati na bolje Å”to će uticati i na strukturu i karakteristike pneumatika koje će vozači u Srbiji kupovati u narednim godinama.The paper presents the results of the condition and characteristics of tires that are in use in Serbia. Data on wear patterns, sizes, ages, brand, type, more than 700 tire and vehicle information to which they are mounted. Data about tread depth, dimensions, tire age, brand and type of more then 700 tested tires were gathered, as well as information about vehicles to which they are mounted on. Primary conclusion on tire condition is positive, notably better then than the Serbian vehicle fleet condition. Average age of tires was around three years and measured tread depth about 5 mm. A significant part of the examined vehicles was equipped with winter tires. First survey (Belgrade, November 2009) for winter tire usage had good showings with around 25% cars equipped with such tires. During the second survey (Belgrade, July 2010) decline of about 5% was found. In Užice, where survey was conducted in November of 2010 it was found that the percentage of winter tires increased up to 50%. Structure and age of the passenger cars fleet in Serbia have been assessed as unsatisfactory. With the current level of fleet renewal such a situation will be very slowly changing for the better and that will affect both the structure and characteristics of tires that will be bought in Serbia in the coming years. With the current level of renewal of the fleet, such situation will be very slowly changed for the better that will affect the structure and characteristics of tires that that will be purchased in the coming years in Serbia

    Cost benefit analysis of Belgrade tram rolling stock

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    Tramvajski saobraćaj ima važno mesto i perspektivu u sistemu javnog gradskog prevoza u Beogradu. Sagledavajući sadaÅ”nje stanje i buduće potrebe, Grad Beograd planira revitalizaciju, rehabilitaciju i osavremenjivanje ovog vida prevoza. Zadatak "Cost-benefit analize tramvajskog voznog parka", prikazane u radu, bio je da predloži takav način obnove tramvajskog voznog parka koji bi, uzimajući u obzir sva tehnička, finansijska i vremenska ograničenja, građanima Beograda obezbedio bezbedan, komforan i ekonomičan prevoz u narednih 20-30 godina. Za analizu je koriŔćen specijalizovani računarski program za viÅ”ekriterijumsku analizu Criterium Decision Plus.The tram traffic has important place and good perspective in Belgrade public transportation system. According to the current state and to the future needs, city of Belgrade plans revitalization, rehabilitation and modernization of this form of transportation. The mission of "Cost-benefit analysis of Belgrade tram rolling stock" was to recommend renewal of tram rolling stock in a manner that would, seeing the all technical, finance and time limits, provide safe, cozy and economical transport to the citizens of Belgrade in the next 20-30 years. For analysis was used special computer program for multimeasure analysis Criterium Decision Plus

    Cost benefit analysis of Belgrade tram rolling stock

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    Tramvajski saobraćaj ima važno mesto i perspektivu u sistemu javnog gradskog prevoza u Beogradu. Sagledavajući sadaÅ”nje stanje i buduće potrebe, Grad Beograd planira revitalizaciju, rehabilitaciju i osavremenjivanje ovog vida prevoza. Zadatak "Cost-benefit analize tramvajskog voznog parka", prikazane u radu, bio je da predloži takav način obnove tramvajskog voznog parka koji bi, uzimajući u obzir sva tehnička, finansijska i vremenska ograničenja, građanima Beograda obezbedio bezbedan, komforan i ekonomičan prevoz u narednih 20-30 godina. Za analizu je koriŔćen specijalizovani računarski program za viÅ”ekriterijumsku analizu Criterium Decision Plus.The tram traffic has important place and good perspective in Belgrade public transportation system. According to the current state and to the future needs, city of Belgrade plans revitalization, rehabilitation and modernization of this form of transportation. The mission of "Cost-benefit analysis of Belgrade tram rolling stock" was to recommend renewal of tram rolling stock in a manner that would, seeing the all technical, finance and time limits, provide safe, cozy and economical transport to the citizens of Belgrade in the next 20-30 years. For analysis was used special computer program for multimeasure analysis Criterium Decision Plus

    Comparative analysis of characteristics of passenger car tires in Serbia

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    U radu su predstavljeni rezultati istraživanja stanja i karakteristika pneumatika koji se voze u Srbiji. Prikupljeni su podaci o pohabanosti dezena, dimenzijama, starosti, marki, tipu viÅ”e od 700 pneumatika kao i podaci o vozilima na kojima su montirani. Osnovni zaključak je da je stanje pneumatika dobro, odnosno znatno bolje nego Å”to je sanje voznog parka u Srbiji. Prosečna izmerena dubina Å”are protektora bila je oko 5 mm, a prosečna starost kontrolisanih pneumatika oko 3 godine. Značajan deo pregledanih vozila bio je opremljen zimskim pneumaticima. Prva istraživanja (Beograd, novembar 2009) o koriŔćenju zimskih dala su dobre rezultate sa oko 25% automobila opremljenih sa takvim gumama. Tokom drugog istraživanja (Beograd, juli 2010) uočen je pad od oko 5%. U Užicu, gde su sprovedena istraživanja u novembru 2010 godine utvrđeno je da se taj procenat popeo na 50%. Struktura i starost voznog parka u Srbiji su ocenjeni kao nezadovoljavajući. Sa sadaÅ”njim stepenom obnove voznog parka, takvo stanje će se veoma polako menjati na bolje Å”to će uticati i na strukturu i karakteristike pneumatika koje će vozači u Srbiji kupovati u narednim godinama.The paper presents the results of the condition and characteristics of tires that are in use in Serbia. Data on wear patterns, sizes, ages, brand, type, more than 700 tire and vehicle information to which they are mounted. Data about tread depth, dimensions, tire age, brand and type of more then 700 tested tires were gathered, as well as information about vehicles to which they are mounted on. Primary conclusion on tire condition is positive, notably better then than the Serbian vehicle fleet condition. Average age of tires was around three years and measured tread depth about 5 mm. A significant part of the examined vehicles was equipped with winter tires. First survey (Belgrade, November 2009) for winter tire usage had good showings with around 25% cars equipped with such tires. During the second survey (Belgrade, July 2010) decline of about 5% was found. In Užice, where survey was conducted in November of 2010 it was found that the percentage of winter tires increased up to 50%. Structure and age of the passenger cars fleet in Serbia have been assessed as unsatisfactory. With the current level of fleet renewal such a situation will be very slowly changing for the better and that will affect both the structure and characteristics of tires that will be bought in Serbia in the coming years. With the current level of renewal of the fleet, such situation will be very slowly changed for the better that will affect the structure and characteristics of tires that that will be purchased in the coming years in Serbia

    Microbiological activity of barley rhizosphere grown on deposol

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    The aim of this paper was to investigate microbiological activity in barley rhizosphere, after the experiment with 17 recultivation treatments of deposols with different organo-mineral materials. The most important agrochemical properties of deposols have been examined. The presence of the microorganisms was determined by the usual microbiological mediums. Dehydrogenase activity was determined by the Cassida et al. method. The deposols were poor in organic matter, nitrogen, phosphorus and potassium. The number of bacteria ranged from 9.3 to 413.3 Ɨ 106g-1. The addition of organo-mineral materials into deposols has caused an increase of microbial biomass and dehydrogenase activity, comparing with control

    Tire operating costs

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    U radu je analiziran uticaj faktora koji direktno utiču na troÅ”kove eksploatacije pneumatika. Kao primer uzeti su podaci dobijeni praćenjem životnog ciklusa pneumatika montiranih na točkove gradskih autobusa. Napravljena su poređenja za Å”est pneumatika različitih proizvođača prema nabavnoj ceni, veku protektora, ukupnom veku i jediničnim troÅ”kovima eksploatacije pneumatika. Analiza je dopunjena i poređenjem efekata koje pneumatici imaju na životnu sredinu. .Factors directly affecting the costs of tire exploitation are discussed. Data obtained by following the lifetime of tires of the city buses are shown. The purchase price, retread life, tire life and unit tire cost are compared for six tires produced in different companies. In addition a comparative analysis of the ecological effects of the tire exploitation is pursued.
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