The world's most developed countries and the European Union (EU) deem that the renewable energy sources should partly substitute fossil fuels and become a "bridge" to the utilization of other energy sources of the future. This paper will present the possibility of using pruned biomass from fruit cultivars. It will also present the calculation of potential energy from the mentioned raw materials in order to determine the extent of replacement of non-renewable sources with these types of renewable energy. One of the results of the intensive fruit-growing process, in post pruning stage, is large amount of pruned biomass waste. Based on the calculated biomass (kg ha -1 ) from intensively grown woody fruit crops that are most grown in Croatia (apple, pear, apricots, peach and nectarine, sweet cherry, sour cherry, prune, walnut, hazelnut, almond, fig, grapevine, and olive) and the analysis of combustible (carbon 45.55-49.28%, hydrogen 5.91-6.83%, and sulphur 0.18-0.21%) and non-combustible matters (oxygen 43.34-46.6%, nitrogen 0.54-1.05%, moisture 3.65-8.83%, ashes 1.52-5.39%) with impact of lowering the biomass heating value (15.602-17.727 MJ kg -1 ), the energy potential of the pruned fruit biomass is calculated at 4.21 PJ.Additional key words: bioenergy; heating values; olive groves; orchards; renewable energy sources; vineyards. Resumen Potencial energético de la biomasa procedente de árboles frutales podados en CroaciaLos principales países desarrollados del mundo y de la Unión Europea (UE) consideran que las fuentes de energía renovables deberían sustituir parcialmente a los combustibles fósiles y convertirse en el futuro en un "puente" hacia la utilización de otras fuentes de energía. En este trabajo, se planteó la posibilidad de utilizar biomasa cortada procedente de cultivos frutales con el propósito de calcular el potencial energético del mencionado material en bruto, así como determinar el grado de remplazo de fuentes no renovables con este tipo de fuentes de energía renovable. Uno de los resultados del proceso de cultivo de frutales en intensivo, tras la época de poda, es la gran cantidad de biomasa cortada inútil. En base al cálculo de biomasa (kg ha -1 ) de los frutales leñosos de cultivo intensivo más comunes en el territorio de Croacia (manzano, peral, albaricoquero, melocotonero y nectarino, cerezo, guindo, ciruelo, nogal, avellano, almendro, higuera, viña y olivo) y en base al análisis de partículas combustibles (carbono 45,55-49,28%, hidrógeno 5,91-6,83% y azufre 0,18-0,21%) y de partículas no combustibles (oxígeno 43,34-46,6%, nitrógeno 0,54-1,05%, vapor de agua 3,65-8,83% y cenizas 1,52-5,39%) que influyen en el poder calorífico inferior de la biomasa (15, ), se calcula que la energía potencial de los restos de poda de frutales es 4.21 PJ.

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The potential of energy crops Sida hermaphrodita on organic farm'.A b s t r a c t. In the context of the growing demand for biomass, which is being encouraged by the EU directives on the promotion of the use of renewable energy, recent investigations have been increasingly focused on fast-growing energy crops. The aim of this study was to investigate the energy properties of three types of agricultural energy crops: Arundo donax L., Miscanthus × giganteus and Sida hermaphrodita. This investigation looked into the content of non-combustible and combustible matter, higher and lower heating values, lignocellulose content, and biomass macro-elements. The results indicate that the energy values of these crops are comparable, while their lignocellulose content shows significant variations. Thus, Arundo donax L. can best be utilised as solid biofuel due to its highest lignin content, while Miscanthus × giganteus and Sida hermaphrodita L. can be used for both liquid and solid biofuels production. As far as Arundo donax L. is concerned, a higher ash level should be taken into consideration.K e y w o r d s : energy crops, energy values, chemical composition

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