Tag Archives: energy balance

024-032 M.F. Baran and O. Gökdoğan
Energy balance in production of chickpea in Turkey: A study performed in Adıyaman Province
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Energy balance in production of chickpea in Turkey: A study performed in Adıyaman Province

M.F. Baran¹* and O. Gökdoğan²

¹Department of Energy Systems Engineering, Faculty of Technology, University of Adıyaman, TR02040 Adıyaman, Turkey
²Department of Biosystem Engineering, Faculty of Engineering-Architecture, University of Nevşehir Hacı Bektaş Veli University, TR50300 Nevşehir, Turkey
*Correspondence: mbaran@adiyaman.edu.tr

Abstract:

In this study, it has been aimed to form the energy balance in the production of chickpea (Cicer arietinum L.) in Adıyaman province of Turkey. The material of the research consists of the chickpea enterprises in the center of Adıyaman province in the scope of the production season of 2015–2016. In this study, the number of enterprises for which is required to be made the study has been computed as 67 according to the simple random sampling method. Survey and observation studies have carried out in these designated enterprises. The energy equivalence of the chickpea samples taken from the enterprises has been determined by the calorimeter device. According to results of the study; the total energy input has been computed as 12,225.69 MJ ha-1 and the total energy output has been computed as 31,527.52 MJ ha-1. The energy inputs in the production of chickpea have been 3,575.69 MJ ha-1 (29.25%), 3,523.08 MJ ha-1 (28.82%), 3,280.32 MJ ha-1 (26.83%), 1,230.39 MJ ha-1 (10.07%), 358.20 MJ ha-1 (2.93%), 131.52 MJ ha-1 (1.08%) and 126.50 MJ ha-1 (1.03%) as fuel energy, chemical fertilizers energy, seed energy, machinery energy, farmyard manure energy, human labour energy and chemicals energy inputs, respectively. In this study, indicators showing the energy ratio, specific energy, energy productivity and net energy were determined as 2.58, 7.07 MJ kg-1, 0.14 kg MJ-1 and 19,301.83 MJ ha-1, respectively. According to the results of the study, it is clear that chickpea production is an economical production for the 2015–2016 production seasons.

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519-526 M. Kolarikova,, T. Ivanova, B. Havrland and K. Amonov
Evaluation of sustainability aspect – energy balance of briquettes made of hemp biomass cultivated in Moldova
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Evaluation of sustainability aspect – energy balance of briquettes made of hemp biomass cultivated in Moldova

M. Kolarikova¹,*, T. Ivanova¹, B. Havrland¹ and K. Amonov²

¹Faculty of Tropical AgriSciences, Czech University of Life Sciences, Kamycka 129, 12641Praha 6, Czech Republic; 2Central Bohemia University, Pod Vodarenskou vezi 4, 18200Praha 8, Czech Republic *Correspondence: kolarikova@ftz.czu.cz

Abstract:

Biomass is currently a significant source of energy mainly for its availability and high potential. Energy crops suitable for energy purposes must have a positive energy balance within the whole production cycle. Industrial hemp (Cannabis sativa L.) has a high yield in a short period of time and reaches a gross calorific value similar to that of wood. Two hemp cultivars were experimentally sown in the Republic of Moldova in order to determine the yield and energy balance for utilization of solid fuels in the form of briquettes. Briquettes were considered to be used in small – scale boilers for heating purposes with a thermal efficiency of 80%. Hemp harvested as a green plant in autumn was left under a roof for losing moisture, to keep yield as high as possible and left the field for another crop in rotation system. The energy balance included all forms of inputs – energy of human labor, energy in fuels, in seeds and in the machines during the technological process according to common practises in Moldova. Energy Return on Energy Invested (EROEI), due to the large share of manual labor and agricultural practices without using of fertilizers, exceeded the value of 12.6. This means that it is classified as very suitable for energy purposes. Hemp appears to be a promising energy crop in temperate climate and it is able to contribute solving the energy situation in Moldova.

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445-452 V. Scholz, J. Kern and P. Kaulfuß
Environmental effects of energy crop cultivation – results of a long-term field trial
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Environmental effects of energy crop cultivation – results of a long-term field trial

V. Scholz¹, J. Kern² and P. Kaulfuß³

¹Leibniz-Institute for Agricultural Engineering Potsdam-Bornim (ATB), Max-Eyth-Allee 100, D-14469 Potsdam, Germany, e-mail: vscholz@atb-potsdam.de
²Postal address above, e-mail: jkern@atb-potsdam.de
³Postal address above, e-mail: pkaulfuss@atb-potsdam.de

Abstract:

In order to identify crop species for sustainable energy farming it is necessary to determine the significance of genetic, environmental and growing-technical factors. Therefore, in 1994 a  long-term practically oriented field experiment on a sandy soil was established to investigate ten annual and perennial plant species and the effects of different N-fertilisation. The measuring programme includes yields, energy gain, N2O emissions as well as ecologically relevant plant and soil constituents. The results of this 15-year trial confirm the possibility of ecological and energy-efficient production of various energy crop species.

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