LATVIA UNIVERSITY OF AGRICULTURE - Latvijas ...

Methane producing bacteria use only organic compounds during the biogas production process. TheODM content depends on the total dry matter content of winter wheat silage and on the ash content in the drymatter. The average ash content of the silage obtained from the biomass of all examined winter wheat varietieswas IMPACT higher OF in HARVEST those samples TIMING that AND were CULTIVAR harvested ON at GS 60-62. The ash content in the samples of silage madefrom BIOGAS the wheat OUTCOME that was FROM harvested WINTER at WHEAT later growth SILAGE stages was slightly lower (Table 2). Inga Whereas Jansone, the Zinta total Gaile DMcontent of biomass at harvesting as well as that of silage had the tendency to grow when the wheat was harvestedat later growth stages.Organic dry matter yield of silage,t ha -116141210864207.30 7.665.7613.4112.02 13.0212.10 12.3910.59GS 60 - 62 GS 70 - 72 GS 80 - 82Figure Figure 1. The 1. organic The organic dry matter dry matter yield yield of wheat of wheat silage silage depending depending on the on winter the winter wheat wheat harvest harvest timing,t ha -1 , LSD AB0.05 = 1.104: □ – ‘Mulan’; ■ – ‘99-115’; ■ – ‘Skalmeje’.timing, t ha -1 , LSD AB0.05= 1.104: □ – ‘Mulan’; ■ – ‘99-115’; ■ – ‘Skalmeje’. Table 2Although we discuss the production of biogas, the most important component of biogas is methane(CH 4 ).TheThechemicalmethanecompositionoutcome dependsof winteron thewheatchemicalsilagecompositionat during harvestingof silage.times,Accordingg kg -1 toofthedryscientificmatterdatadescribed in the research of Austrian scientists (Amon et al., 2007) the chemical components of silage, namelycrude protein, crude fibre, crude fat and crude ash, affect the methane outcome.The chemical composition of the silage depending on the harvest timingAnalysed indicatorsGS 60-62 GS 70-72 GS 80-82 Table 2The Crude chemical ash composition of winter wheat 53.8silage at during harvesting 48.0 times, g kg -1 of dry matter 43.9Crude protein 111.2 86.4 82.3Analysed Crude indicators fibre The chemical 354.0 composition of the silage 300.6 depending on the harvest 286.4 timingCrude fat GS 60-62 19.8 GS 70-72 21.8 GS 80-82 15.8Crude ash Starch 5.053.8 174.7 48.0 274.5 43.9Crude protein 111.2 86.4 82.3Crude dry matter fibre yield (Table 1) and silage yield (Fig. 354.0 1) namely crude protein, 300.6 crude fibre, crude fat and crude 286.4Crude when fat being harvested at the early yellow ripeness 19.8 ash, affect the methane 21.8 outcome.15.8Starch stage (GS 80-82) in comparison to the yields obtained 5.0 Crude protein and 174.7 crude fibre content in the wheat 274.5when the variety was harvested at the early milk stage. silage had the tendency to diminish if the silage wasMethane producing bacteria use only organic made from the biomass of wheat that was harvested atcompounds Crude during protein the and biogas crude fibre production content process. in the wheat GS silage 70-72 had and the GS tendency 80-82. Crude to diminish protein if diminished the silage was inmade The from ODM the content biomass depends of wheat on that the was total harvested dry matterGS the 70-72 range and from GS 111.2 80-82. g Crude kg -1 (GS protein 60-62) diminished to 82.3 g in kgthe-1(GS 80-82) (Table 2). Canadian scientists (Khorasanirange content from of 111.2 winter g wheat kg -1 (GS silage 60-62) and on to 82.3 the ash g kg content(GS 80-82) (Table 2). Canadian scientists (Khorasani et al.,et al., 1997) have also noted in their research that1997) in the have dry also matter. noted The in their average research ash content that the of crude the protein the crude content protein is lower content in the is lower silage in that the is silage made that fromplants silage harvested obtained at from later the growth biomass stages. of all The examined crude fibre is made content from in plants the harvested winter wheat later silage growth diminished stages.respectively winter wheat by varieties 53.4 and was 14.2 higher g kg -1 in at those each samples succeeding The plant crude growth fibre stage. content According the winter to the wheat data of silage otherauthors’that wereresearchharvested(Amonat GSet al.,60-62.2007;TheHerrmannash contentet al.,in2011), diminished the crude respectively protein and by crude 53.4 fibre and content 14.2 g of kgcereal-1 atthe samples of silage made from the wheat that was each succeeding plant growth stage. According to thesilage significantly influences the methane outcome. The factharvested at later growth stages was slightly lower datathatof otherstarchauthors’content ofresearchthe silage(Amonsampleset al.,rose2007;from5.0(Tableg kg -1 2).(GSWhereas60-62) tothe274.5totalgDMkg -1 content(GS 80-82)of biomassindicates Herrmann that the cereals et al., are 2011), ripening. the crude protein and crudeat harvesting as well as that of silage had the tendency fibre content of cereal silage significantly influencesto grow when the wheat was harvested at later growth the methane outcome. The fact that starch content ofstages.the silage samples rose from 5.0 g kg -1 (GS 60-62) to274.5 g kgAlthough we discuss the production of biogas,(GS 80-82) indicates that the cereals areripening.the most important component of biogas is methaneExamining other species of energy crops, Polish(CH 4). The methane outcome depends on the chemicalscientists have noted that an increased lignin contentcomposition of silage. According to the scientific dataof silage reduces the methane outcome (Klimiuk et al.,described in the research of Austrian scientists (Amon2010).et al., 2007) the chemical components of silage,20 Research for Rural Development 2012