Energy analysis of various grassland utilisation systems

Abstract

RžONCA, J., MITRUŠKOVá, M., POZDÍŠEK, J., POSPIŠIL, R., MIČOVá, P., ŠTýBNAROVá, M., SVOZILOVá, M.: Energy analysis of various grassland utilisation systems. Acta univ. agric. et silvic. Mendel. Brun., 2005, LIII, No. 4, pp. 117-126 In 2003 and 2004 was carried out the energy analysis of the different types of permanent grassland utilization on the Hrubý Jeseník locality. There were estimated values of the particular entrances of additional energy. Energy entrances moved according to the pratotechnologies from 2.17 gJ. ha -1 to 22.70 gJ.ha -1 . The biggest share on energy entrances had fertilizers. It was 84.93% by the nitrogen fertilisation. The most energy benefit of brutto and nettoenergy was marked by the low intensive utilisation (33.40 gJ.ha -1 NEL and 32.40 gJ.ha -1 NEV on average). The highest value of energy efficiency (13.23%) was marked by the low intensive utilization of permanent grassland. By using of higher doses of industrial fertilizers has energy efficiency decreased. From view of energy benefit and intensiveness on energy entrances it appears the most available utilisation of permanent grassland with three cuts per year (first cut on May 31 st at the latest, every next after 60 days) or two cuts per year (first cut on July 15 th

Energy and Greenhouse Gases Balances of Cotton Farming in Iran: A Case Study

“…In these farms, very opportunities are to decrease the input energy without any reduction in the total output yield. Similar results is mentioned also in the past study by Ržonca et al (2005) who showed energy efficiency has decreased by increasing the input energies in grasslands.…”