Tag Archives: energy input

229-239 A. Kryževičienė, A. Jasinskas and A. Gulbinas
Perennial grasses as a source of bioenergy in Lithuania
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Perennial grasses as a source of bioenergy in Lithuania

A. Kryževičienė¹, A. Jasinskas² and A. Gulbinas²

¹ Lithuanian Institute of Agriculture, Instituto al.1, LT-58344 Akademija,Kėdainiai reg., Lithuania; e-mail: akryzeviciene@lzi.lt
² Institute of Agricultural Engineering Lithuanian University of Agriculture,Raudondvaris, LT-54132 Kaunas reg., Lithuania; e-mail: aljas@mei.lt

Abstract:

The study was designed to investigate the feasibility of cultivating perennial grasses as energy crops and their effect on soil agroecological potential. Field experiments with different grasses were conducted at the Lithuanian Institute of Agriculture from 2000–2004. Perennial grasses Phalaroides arundinacea L. and Bromopsis inermis Leysser were grown pure and in mixtures with legumes. Melilotus officinalis, Lupinus polyphyllus and Galega orientalis on a light gleyic loam soil (Cambisol) with a humus content of ca. to 2%. Pure swards of grasses were either fertilized with nitrogen or not. Mixtures did not receive any N. The swards were cut once per season when their biomass was used for combustion, and twice per season when their biomass was used for biogas. Dry matter yield of grasses in pure stands ranged from 6.4 to 9.3 t ha-1. Under normal weather conditions grass-legume mixtures without nitrogen (N) fertilization were higher yielding than N-fertilized (60+60 kg N ha-1) grass in pure swards, but the mixtures were lower yielding in the years with inadequate rainfall. In all cases mixtures had an important ecological advantage over N-fertilized grass swards. The swards had a positive soil conservation effect and maintained soil fertility potential.The energy potential of perennial grasses in both cases of biomass utilization variedaccording to DM yield variation and totaled up to 153 GJ ha-1; energy input for biofuel production amounted to 8.0 – 19.2 GJ ha-1. Our experimental evidence suggests that the tested swards sown on less fertile soil, amounting to over 0.5 million ha in Lithuania, would be able to produce to 4 million tons of biomass for energy production annually.

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37-45 A. Jasinskas, G. Rutkauskas, B. Kavolėlis,A. Sakalauskas and E. Šarauskis
The energetic evaluation of technologies for fuel preparation from grass plants
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The energetic evaluation of technologies for fuel preparation from grass plants

A. Jasinskas¹, G. Rutkauskas¹, B. Kavolėlis¹,A. Sakalauskas² and E. Šarauskis²

¹Institute of Agricultural Engineering of Lithuanian University of Agriculture,Institute St. 20, LT-54132 Raudondvaris, Kaunas distr., Lithuania; e-mail: aljas@mei.lt
²Department of Agricultural Machinery, Lithuanian University of Agriculture,Studentu St. 15A, LT-53361 Akademija, Kaunas distr., Lithuania;e-mail: ZUM.katedra@lzuu.lt

Abstract:

The technologies of growing, harvesting and preparing for fuel traditional feed type grasses (the mix of cereal and legume grasses) and coarse-stemmed vegetative plants (topinambours and sunflowers) were evaluated and a rational technique was selected. The methods of energetic evaluation of fuel preparation technologies were reviewed.After energetic evaluation of the technologies it was estimated that the total energy inputof growing and harvesting grasses and legumes was equal to 8334 MJ ha-1, topinambour stems – 14378 MJ ha-1 and sunflower stems – 11324 MJ ha-1 respectively. The total energy input of growing and harvesting of traditional grasses was by 72% lower than that of topinambour stems and by 36% lower than the energy input required for fuel production from sunflower stems. From an energetic perspective, the technology of fuel preparation from traditional grasses is more advantageous than the technologies of fuel preparation from coarse-stemmed plants, specifically topinambour and sunflower stems.

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