Summary

By the exploration made at the period 1995-97, the next results has appeared: The density of sowing has important influence to yield increase. The hybrids of lower and medium vegetation period make the most of yields at the largest examined density (71.400 p/ha), while the hybrids of longer vegetation period need medium density (51.000-59.500 p/ha). Sowing term has a great influence to yield increase, so that all the hybrids by sowing in later term has made quite a less grain yield. The time of basic tillige had an important influence to grain yield, so that grain yield at the fall basic tillige was mainly greater than grain yield made at spring basic tillige. The greatest grain yield was made by the hybrid NS 420, in all examined possibilities.

          Key words: Hybrids, sowing density, sowing term, basic tillige, yield.