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Novi rekonstruisani kombajn ELEKTRONIK SP-09, je samohodna mašina koja je od svoga predhodnika ELEKTRONIK SP-07 zadržala princip jednostranog ubiranja polovine reda žbunastog jagodastog voća. Mašina je posebno prilagođena za branje remontantnih sorti maline bez potpore, mada se može uspešno koristiti i za druge vrste voća žbunaste forme. Razdeljivač usmerava jednu polovinu račvastog žbuna do jedinice za protresanje, gde vibrirajuće palice odvajaju bobice. Iz mase plodova, koji se transportuje kosom transportnom trakom na horizontalnu, struja vazduha iz ventilatora uklanja primese. Transportna traka može puniti male gajbice, a kapacitet prostora za odlaganje punih gajbica je oko 200 kg. Hidrostatički pogon pokreće SUS motor snage 50 kW. Parametri rada radnih delova se podešavaju da bi otpali samo zreli plodovi. Mogu se podešavati: - amplituda i frekvencija oscilovanja, - prečnik valjka i dužina palica, - prečnik palica, - radna brzina berača-kombajna. Među najvažnijim opštim konstruktivnim karakteristikama ističu se: - jednostavan modularni dizajn, koji omogućava: • uskladjivanje mašine sa specifičnim potrebama korisnika, • brzo i jednostavno prilagodjavanje za ubiranje različitih vrsta jagodastog voća. - pogon radnih komponenata kombajna ostvaruje se pomoću odgovarajućih kombinacija hidrauličnih i mehaničkih prenosnika snage, što mu omogućava veliku prilagodljivost različitim radnim uslovima na terenu (sl. 2 i 3). - posebna oscilujuća glava sa glatkim, plastičnim palicama na otresajućoj koloni; - pred-separator za uklanjanje nečistoće manjih dimezija; - dodatni separatorski transporter, koji olakšava uklanjanje oštećenih plodova; Pogon hidrauličkog sistema čine četiri jednosmerne zapreminske pumpe stalnog protoka: P1, P2, P3 i P4. Paralelno su spregnute, a pogon im omogućava zajedničko vratilo, koje snagu od dizel SUS motora kombajna (M) preuzima preko jednostepenog kaišnog prenosnika prenosnog odnosa i=1. Ovaj tip prenosnika, uz tiši rad, jednostavnu konstrukciju i

This paper presents the tests results of three types of hay mowing machines (later in text: mowers), namely a self-propelled oscillatory mower-conditioner and two tractor-mounted mowers with oscillatory and rotary blades, used to mow alfalfa grown under dry land conditions in the region of central Serbia during three seasons in 2014, 2015 and 2016. Although characterized by older design, they are still commonly used at smaller and medium size farms in this region. Therefore, their optimal exploitation parameters are still of large importance for hay quality and production efficiency and sustainability. The exploitation parameters of all three mowers generally increased linearly with higher speeds, having high R2 values (over 0,8), with rare exceptions. The regression coefficients b clearly showed that the self-propelled mower-conditioner achieved maximum increase in production performance (b = 0,3606), compared with the oscillatory (b = 0,1158) and rotary mowers (b = 0,1414). Mower design had a significant (p ≤ 0,001) effect on cutting and chopping losses, production performance, and specific fuel consumption (p ≤ 0,05). The tests confirmed the superiority of the self-propelled mower over the two mowers aggregated with tractors.

The paper presents the three years efficiency results (2011-2013) of the work and ways of harvesting (three types of mowers, with or without spreading the forage) influencing the quality of the forage (the content of crude protein and crude fiber) during the three days drying process. These results indicate that the harvesting method can strongly affect the work efficiency, energy consumption, the forage drying intensity and the quality of forage used for hay and haylage preparation. The best quality of the forage was achieved when a drum rotating mower POTTINGER CAT 185 was used. Negative correlation was found between content of crude protein and the crude fibre content, depending on the type of mower, varying in the range between r= -0.978 and r= -0.882 (POTTINGER CAT 185 r= -0.882 P lt = 0.05 to JF STOLL SB 200 r= -0.978 P lt = 0.001).

At present, spreading of mineral fertilizers in Europe is most commonly performed using centrifugal disk spreaders with attached vanes. The motion of an ideal spherical homogeneous fertilizer particle along the straight vane attached to a flat rotating disc was analyzed in this paper. The analysis was performed in the non-inertial reference coordinate system. From the assumptions introduced to enable analytical describing of the real particle motion as well as the general tools of solid mechanics, the ordinary in-homogenous second-order differential equation having constant coefficients arose. Its solution represents an approximation of the real relative motion of the fertilizer particle along the straight radial vane fixed to the flat horizontal disc rotating at a constant angular velocity. However, the solution of this kind can be very useful for the optimization of centrifugal spreader working parameters., U Evropi se za rasipanje granularnog mineralnog đubriva najčešće koriste centrifugalni rasipači sa lopaticama. U ovom radu je analizirano kretanje idealne, loptaste, homogene granule đubriva duž lopatica postavljenih po rotirajućem disku. Analiza je izvedena primenom neinercijalnog referentnog koordinatnog sistema. Uvođenjem određenih pretpostavki i primenom zakona teorijske mehanike za opisivanje kretanja čestice, formirana je nehomogena diferencijalna jednačina drugog reda sa konstantnim koeficijentima. Njeno rešenje aproksimira realno relativno kretanje čestice đubriva duž ravnih radijalnih lopatica pričvršćenih za horizontalni disk, koji se obrće konstantnom ugaonom brzinom. Dobijeno rešenje se svakako može koristiti za optimizaciju radnih parametara centrifugalnog rasipača sa diskom.

Proper protection and quality work of sprayer enable the optimization of the pesticide application and reduces the harmful effects on the environment and human health. The efficiency of the implemented protection is reflected in several aspects, and one of the most important is the quality of the work of sprayers, that is, the equality of pesticides distribution with nozzles. The paper presents an analysis and comparison of test results in the framework of the inspection of field crop sprayers in the exploitation conditions of central Serbia, in accordance with European standards EN 13790, which prescribes methods and equipment for inspection. The aim of the research was to determine the quality of the work of chests and the uniformity of the flow of various sprays, depending on the defined parameters. The test equipment used 'AAMSSALVARANI' measuring equipment, and the flow of the nozzles was measured by the SN S001 individual nozzles. On the basis of the obtained results, it was concluded that the average values of the flow of the sprayer amounted to 0.954 l min-1 (typ A), 1.169 l min-1 (typ B), or until 1.190 l min-1 (sprayer typ C), where the coefficient of variation was in the range 12.24% to 29.49%., Pravilnom zaštitom i kvalitetnim radom prskalica omogućuje se optimizacija aplikacije pesticida i smanjuje štetni uticaj na životnu sredinu i zdravlje ljudi. Efikasnost izvedene zaštite ogleda se sa više aspekata a jedan od najznačajnijih je kvalitet rada prskalica, odnosno uniformnost distribucije pesticida rasprskivačima. Rad predstavlja analizu i upoređenje rezultata ispitivanja u sklopu inspekcijske kontrole ratarskih prskalica u eksploatacionim uslovima centralne Srbije, u skladu sa evropskim normama EN 13790 koji propisuje metode i opremu za obavljanje inspekcije. Cilj istraživanja je bio da se utvrdi kvalitet rada prsaklica i uniformnost protoka različitih rasprskivača u zavisnosti od definisanih parametara. Za ispitivanje je korišćena merna oprema 'AAMSSALVARANI', a protok rasprskivača je meren pomoću ispitivača pojedinačnih rasprskivača SN S001. Na osnovu dobijenih rezultata zaključeno je da su prosečne vrednosti protoka rasprskivača iznosile 0,954 l min-1 (tip A), 1,169 l min-1 (tip B), odnosno 1,190 l min-1 (tip C), pri čemu je koeficijent varijacije bio u rasponu 12,24% do 29,49%.