Effects of seeding rate and time of cut on the yield and quality of sudangrass (Sorghum sudanense (Piper) Stapf.) | Vpliv količine semena za setev in časa košnje na pridelek in kakovost sudanske trave (Sorghum sudanense (Piper) Stapf.)

Inglés. In the years 1996 and 1997 the effects of two seeding rates (25 and 55 kg ha-1) and stage of growth (harvest at stem elongation stage at the heights of 50 cm, 100 cm, 150 cm, and harvest at early heading) on the yield of sudangrass (Sorghum sudanense (Piper) Stapf., cultivar Srem) were investigated  in field experiment on brown soil near Maribor. The lowest annual dry matter (DM) yield, i. e. 3.31 t ha-1 was obtained in 1996 at seeding rate of 25 kg ha-1 and harvest of 50 cm high plants (3 cuts), whereas the highest DM yield, i. e.16.23 t ha-1 was achieved in 1997 at seeding rate of 55 kg ha-1 and harvest at early heading (2 cuts). The higher seeding rate and delayed harvest resulted in the decrease of the crude protein content in DM. 'In vitro' digestibility of organic matter was higher than 60% only at harvest of plants at 50 cm height.

Esloveno. V letih 1996 in 1997 je bil v poljskih poskusih na rjavih tleh v bližini Maribora proučevan vpliv količine semena za setev (25 in 55 kg ha-1 ) in časa košnje (v stadiju bilčenja  pri višini rastlin 50 cm, 100 cm, 150 cm in ob začetku latenja) na pridelek in kakovost sudanske trave (Sorghum sudanense (Piper) Stapf.), sorte Srem. Najmanjši skupni letni pridelek 3.31 t ha-1 suhe snovi (s.s.) je bil dosežen v letu 1996 pri odmerku 25 kg semena ha-1 in pri spravilu, ko so rastline dosegle 50 cm višine (3 košnje). Največji pridelek 16.23 t ha-1 s.s. pa je bil dosežen v letu 1997 pri odmerku 55 kg semena ha-1 in spravilu ob začetku latenja (2 košnji). Vsebnost surovih beljakovin v pridelku je bila nižja pri večjem odmerku setve in če je bil posevek ob košnji nižji.