HEMP QUALITY PARAMETERS FOR BIOENERGY-IMPACT OF NITROGEN FERTILIZATION

The aim of the research - to evaluate the nitrogen fertilizer rate impact on the energetic parameters of hemp. The nitrogen fertilizer rate effect on the hemp ash content depends on the hemp variety: for the local variety "Purini", with the increase of the nitrogen fertilizer rate, the ash content decreases, while for the variety "Bialobrzskie" - it is the opposite - increasing the nitrogen fertilizer rate, the ash content increases. Change of the nitrogen fertilizer rate from N-0 to N-100 increased the resulting thermal capacity from one hectare. In this research it was observed that a higher thermal capacity has a positive (p < 0.001) connection with the harvest yield amount. For the sown hemp the nitrogen rate variation increased the thermal energy amount from one hectare for shives by 73 % ("Purini") and 31 % ("Bialobrzskie"), for the stalks by 66 % ("Purini") and 36 % ("Bialobrzskie"). The highest determined thermal capacity for hemp was 171.71 +/- 18.31 GJ.ha(-1).