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2020, vol. 45, br. 1, str. 51-64
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Jednostavne regresijske veze za procenu performansi izabranih priključaka opreme u jugoistočnoj Nigeriji
Simple regression relationships for assessing the performances of selected tillage implements in South-East, Nigeria
aMichael Okpara University of Agriculture, Department of Agricultural & Bioresources Engineering, Umudike, Nigeria bEnugu State University of Science and Technology, Department of Agricultural & Bioresources Engineering, Enugu, Nigeria cMichael Okpara University of Agriculture, Department of Mechanical Engineering, Umudike, Nigeria
e-adresa: odumaoke@gmail.com
Sažetak
Istraživanje je obavljeno na tri dominantna poljoprivredna zemljišta jugoistočne Nigerije da bi se razvio određeni empirijski regresijski odnos za predviđanje performansi nekih odabranih priključaka za obradu zemljišta agregatiranih na traktore na osnovu eksperimentalnih rezultata dobijenih na terenu. Rezultati eksperimenata pokazuju su da optimalna brzina oranja u glinovito-ilovastom i ilovasto - peskovitom zemljištu iznosi 6 km/h, sa odgovarajućom efikasnosti (učinkom) na polju od 88,11%, odnosno 87,55%, dok je u peskovitoglinovito zemljištu za plug registrovana optimalna brzina 7 km/h sa efikasnosti (učinkom) na polju od 87,78%. Optimalna brzina operacije obrade drljanjem na glinovito-ilovastom zemljištu bila je od 8 km/h, a učinak (efikasnost) je 87,98%. Kod ilovasto-peskovitog zemljišta, optimalna brzina bila je 8 km/h, a učinak (efikasnost) bila je 87,19%; dok je u kod peskovito - glinovitog zemljišta registrovana optimalna brzinu od 9 km/h sa učinakom (efikasnost) od 98,54%. Optimalna brzina traktor-podrivač bila je 9 km/h za sva ispitivana zemljišta sa odgovarajućom efikasnosti (učinkom) na polju 87,96%, 87,95%, odnosno 89,09%, za glinovito-ilovasta, ilovasto-peskovita i peskovito-ilovasta zemljišta. Optimalna brzina rotatofreze bila je takođe 9 km/h na svim zemljištima u ispitivanju, sa odgovarajućom efikasnosti (učinkom) od 89,81%, 87,11%, odnosno 89,40%, u glinovito-ilovastom, ilovasto-peskovitom i peskovito-glinovitom tipu zemljišta. Ove efikasnosti (učinci) na polju su eksperimentalno dobijene na terenu su upoređene sa efikasnosti dobijenom iz jednačina regresija, koristeći grešku od ±5%. , a tačnost predviđanja testirana je korišćenjem srednjeg kvadratnog odstupanja R 2 . Upoređivanje predviđenih rezultata sa eksperimentalnim rezultatima otkrilo je da regresione jednačine u velikoj meri nisu premašile ili umanjile eksperimentalne rezultate, tako da su greške predviđanja bile u okviru dozvoljenog raspona od ± 5%. Koeficijent R2 za regresione jednačine razvijen za predviđanje različitih pokazatelja performansi traktorskih priključaka varira od 0,7 do 0,9 što pokazuje da su testirane varijable bile visoko povezane, a takođe su pokazatelj da su regresione jednačine adekvatne za predviđanje performanse priključaka.
Abstract
Research was conducted on the three dominant agricultural soils of southeast Nigeria to develop some empirical regression relationships for predicting the performances of some selected tractor-hitched tillage implements from the experimental results obtained in the field. Results of the experiments revealed that the optimum speed of plough in clay-loam and loamy - sandy soil was 6km/h with corresponding field efficiencies of 88.11% and 87.55% respectively, while in sandy - clay soil, the plough recorded its optimum speed of 7km/h with field efficiency of 87.78%.The optimum speed of harrow in clay-loam soil was 8km/h with field efficiency of 87.98%. In loamy - sandy soil, its optimum speed was 8km/h with field efficiency of 87.19%; while in sandy - clay soil; it recorded optimum speed of 9km/h with field efficiency of 98.54%. The optimum speed of ridger was 9km/h for all the soils with corresponding field efficiencies of 87.96%, 87.95%, and 89.09% respectively, for clay-loam, loamy-sandy and sandy - clay soil. The optimum speed of rotovator was also 9km/hr in all the soils with corresponding field efficiencies of 89.81%, 87.11%, and 89.40% in clay-loam, loamy-sandy and sandy -clay soil, respectively. These field efficiencies experimentally obtained in the field were compared with the efficiencies obtained from the regression equations using percentage error and the accuracy of the predictions were tested using error root mean square. The comparison of the predicted results with the experimental results revealed that the regression equations broadly did not over or underpredict the experimental results, thus, the prediction errors were within allowable range of ±5%. The coefficient of determination, R2 for the regression equations developed for predicting the various performance indicators of the tractor - hitched implements vary from 0.7 to 0.9 which show that the variables tested were highly correlated and also an indication that the regression equations were adequate for predicting the performance of the implements.
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