STEM YIELD OF HEMP CULTIVAR KOMPOLTI IN RELATION TO PLANT DENSITY AND NITROGEN FERTILIZATION

Cilj ovih istraživanja bio je utvrditi optimalnu gustoću sjetve i gnojidbu dušikom za industrijsku konoplju sorte Kompolti uzgajanu primarno radi stabljike. Istraživanja su provedena kroz poljske pokuse postavljene na pokušalištu Visokog gospodarskog učilišta u Križevcima u 2003., 2004. i 2005. godini. Istraživane su tri gustoće sjetve (100, 200 i 300 klijavih sjemenki/m2) i četiri razine gnojidbe dušikom (0, 60, 120 i 180 kg/ha). Pokus je postavljen po split-blok metodi u pet ponavljanja. Sorta Kompolti postigla je vrlo visok prosječan prinos ukupne biomase (34,6 t/ha) i prinos zrako-suhe stabljike (14,3 t/ha) u tri klimatski vrlo različite godine istraživanja. Rezultati ovih istraživanja pokazuju da ukoliko nam nije važna količina i kvaliteta vlakna, za ostvarenje visokih prinosa stabljike, trebalo bi sijati 300 klijavih sjemenki/m2 uz gnojidbu sa 180 kg/ha dušika.The aim of the study was to determine the optimum sowing density and nitrogen fertilization for hemp cultivar Kompolti grown for stem. The investigations were carried out by means of field experiments on the College of Agriculture in Križevci experimental station in years 2003., 2004. and 2005. The Hungarian cultivar Kompolti was used in the experiment. Three different sowing densities (100, 200 and 300 viable seeds/m2) and four nitrogen rates (0, 60, 120 and 180 kg N/ha) were investigated in the experiment. The experiment was set according to the split-block method in five replications. Cultivar Kompolti achieved very high total biomass and air-dry stems yield (average 34.6 t / ha and 14.3 t / ha) in all three climatically very different experimental years. The results of the study show that in order to achieve high yields of the stem 300 viable seeds/m2 should be sown and fertilized with 180 kg N/ha, if quantity and quality of fiber is not important