Annals of Warsaw University of Life Sciences - SGGW.

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28 A. Lisowski et al.in three and two repetitions, respectively,in 30 samples), while in 14 samples (outof 30) of REDUTA variety, harvestedwith forage harvester Class Jaguar 682 Swith 4-row attachment, there were foundin total 23 unbroken grains (averagebelow 1 piece per sample).The mean chaff mass on sieves andtheir percentage ratio are presented inTable 3.X− ⎛ 1.779SAN: Q w = − ⎝ ⎜ ⎞⎠ ⎟1 2 11 . 12because: X 50 = 11.12 mm b = 1.79X− ⎛ 2.297LG2244: Q w = − ⎝ ⎜ ⎞⎠ ⎟1 2 782 .because: X 50 = 7.82 mm b = 2.297TABLE 3. Chaff mass on sieves for particular varietiesNo ofsieveMassSAN LG 2244 REDUTASieve Q w Mass Sieve Q w Mass Sieveresidueresidueresidue[g] [%] [–] [g] [%] [–] [g] [%] [–]1 52.28 2.47 0.975 0 0.00 1.000 65.48 3.96 0.9602 251.4 11.85 0.857 139.94 6.71 0.933 229.01 13.87 0.8223 1169.96 55.17 0.305 1157.48 55.51 0.378 941.68 57.02 0.2514 322.88 15.22 0.153 406.98 19.52 0.183 267.01 16.17 0.0905 264.95 12.49 0.028 306.87 14.72 0.035 131.85 7.98 0.010Bottom 59.27 2.80 – 73.75 3.54 – 16.56 1.00 –Total 2120.74 100 – 2085.02 100 – 1651.59 100 –Q wIn the case of LG2244 variety thechaff mass on the first sieve amountedto less than 1% of the whole sample;therefore, it was assumed as 0.Substituting values of Tables 2 and3 to Equations (2) and (3) there wasobtained:Using Rosin-Rammler model (5) thefollowing equations were obtained:SAN: X gm = 9.93 mmS gm = 2.08 mmLG2244: X gm = 8.65 mmS gm = 2.04 mmREDUTA: X gm = 11.41 mmS gm = 1.87 mmX− ⎛ 2.122REDUTA: Q w = − ⎝ ⎜ ⎞⎠ ⎟1 2 12 . 92because: X 50 = 12.92 mm b = 2.122Figure 3 presents graphical representationof cumulated frequency of undersievemass Q w calculated with dependence(5). The smallest mesh dimension(7.82 mm) needed to sift 50% of samplemass for particular maize varieties wasfound for LG2244 variety, proving itsbest breaking up.
Methods for evaluation of breaking up of maize chaff separated... 291Frequencies of under-sieve mass, Q w0,90,80,70,60,50,40,30,20,10RedutaLG 2244San0 2 4 6 8 10 12 14 16 18 20 22 24 26Mesh diagonal, X i [mm]FIGURE 3. Cumulated frequencies of under-sieve mass for various maize varieties based on Rosin--Rammler modelSUMMARYThe obtained results enable tofind that both forage harvesters werecharacterized by good breaking upefficiency. Almost 100% of grains werebroken, while optimal length of cutamounted to about 10 mm with relativelysmall scatter. Mean geometric lengths ofparticles differed from those calculatedwith Rosin-Rammler equation. Forvarieties SAN and REDUTA, X gm valueswere lower than X 50 by 12 and 13.2%,respectively, while for LG2244 varietyX gm was bigger than X 50 by 9.6%.However, these differences were notvery big, since they were contained in therange of scatter determined by standarddeviation. It proved the usability of boththe methods in determination of chafflength distribution.REFERENCESMICHALSKI T. 1997: Wartość pastewnaplonów kukurydzy w zależności od sposobówi terminów zbioru. Zeszyty ProblemowePostępów Nauk Rolniczych,450: 133–162.ANSI/ASAE S424.1 MAR98: Method of determiningand expressing participle sizeof chopped forage materials by screening.NIEWĘGŁOWSKI K. 2006: Wpływ czynnikówtechnicznych i eksploatacyjnychna wskaźniki jakościowe rozdrabnianiaroślin kukurydzy zbieranych sieczkarniąpolową. Praca doktorska, maszynopis.Warszawa SGGW.SAR Ł. 2007: Projekt konstrukcyjny separatorasitowego. Praca inżynierska,maszynopis. Warszawa SGGW.Streszczenie: Celem pracy było określenie stopniarozdrobnienia sieczki oraz ziarna kukurydzyza pomocą separatora sitowego wykonanego
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