Losses in Alfalfa Mowing Process Performed by Selfpropelled Mower and Hay Crusher “Fortschritt” E 302

Abstract

This paper shows the losses created during alfalfa mowing process performed by self-propelled and hay crusher “Fortschritt” E 302. The losses detected during research process have been divided into two groups: losses caused by increased incision height (over 6 cm), and losses caused by crushing. The total losses made during mowing by the tested mower were calculated by adding the incision height losses and crushing losses. The research results indicate that the minimal losses caused by the incision height are 1,08 % of yields, at the aggregate mowing speed of 4,90 km/h. Aggregate mowing speed increase tend to slightly increase the losses up to maximum values of 1,31 % at the mowing speed of 9,52 km/h. The crunching losses ranged from minimal 0,27 % at the minimal aggregate mowing speed. The average total losses were 1,52 % of yields at the average aggregate mowing speed of 6,89 km/h.

U radu su prikazani gubici koji su nastali prilikom košenja lucerke samohodnom kosačicom-gnječilicom "Fortschritt" E-302. Gubici koji su se javili prilikom ispitivanja, svrstani su u dve grupe, kao gubici usled povećane visine reza (iznad 6 cm), i kao gubici usled usitnjavanja(delovi biljke koje nije moguće zahvatiti radnim organima kosačice, te ostaju neiskorišćeni na parceli). Sabiranjem gubitaka usled visine reza i gubitaka usled usitnjavanja, dobijeni su ukupni gubici pri radu ispitivane kosačice. Određivanje gubitaka vršeno je u četiri probe. Rezultati ispitivanja nam pokazuju da su minimalni gubici usled visine reza iznosili 1,08 % od prinosa, pri brzini kretanja agregata od 4,90 km/h. Sa povećanjem brzine kretanja agregata uočava se tendencija laganog povećanja gubitaka do maksimalne vrednosti od 1,31 %, pri brzini kretanja od 9,52 km/h. Gubici usled usitnjavanja su se kretali od minimalnih 0,27 %, pri maksimalnoj brzini kretanja, do maksimalnih 0,36 % pri minimalnoj brzini kretanja agregata. Prosečni ukupni gubici iznosili su 1,52 % od prinosa, pri prosečnoj brzini kretanja agregata od 6,89 km/h.