Yield potential of switchgrass (Panicum virgatum L.) in the third year of cultivation

Pokusno polje divljeg prosa postavljeno je na pokušalištu Agronomskog fakulteta u Šašinovcu 2016. godine. Divlje proso je posijano samohodnom sijačicom na dubinu od 1 cm i razmak između redova 12 cm. Veličina osnovne parcelice je iznosila 2,4 x 8 m. U pokusu je bilo 12 osnovnih parcelica. U 3. godini uzgoja utvrđen je prinos suhe tvari (PST) divljeg prosa košnjom obračunskih parcelica 2,4 x 1 m u jesen 2018. i proljeće 2019. vaganjem pokošene mase, uzimanjem poduzoraka od oko 1 kg, sušenjem do konstantne mase i preračunavanjem u t/ha ST. Visina biljaka utvrđena je mjerenjem duljine biljke od tla do vrha metlice na 5 slučajno odabranih biljaka po osnovnoj parcelici. Prosječna visina biljke na kraju treće godine uzgoja iznosila je 2,25 m. Prosječni jesenski prinos suhe tvari na kraju treće godine uzgoja iznosio je 19,08 t/ha s prosječnom vlagom od 61,09 %. Prosječni proljetni prinos suhe tvari na kraju treće godine uzgoja iznosio je 13,27 t/ha s prosječnom vlagom od 10,78 %. U proljetnom roku žetve došlo je do značajnog pada prinosa ST od 30,5 %.Experimental field of switchgrass was set on a testing facility at the Faculty of Agriculture in Šašinovec in 2016. Switchgrass was planted with self-propelled drill at a depth of 1 cm. The distance between the rows was 12 cm. Experiment was set on 12 basic plots. The size of each plot was 2,4 x 8 m. In the third growing year switchgrass mass was harvest and weighed from area of 2,4 x 1 m basic plots in autum 2018. and spring 2019. Dry matter yield (DMY) was determined by drying of sub-samples of 1 kg cutted mass to constant weight and conversion to t/ha DM. Plant height was determined on 5 randomly selected plants on basic plots. The average height of plant at the end of third growing year was 2,25 m. The average autum DMY at the end of third growing year was 19,08 t/ha with average moisture of 61,09 %. The average spring harvest of DM was 13,27 t/ha with average moisture of 10,78 %. In spring harvest DMY was dropped significantly dropped 30,5 %