KVALITET SEMENA ITALIJANSKOG LJULJA RAZLIČITE PLOIDNOSTI.

Three cultivars (domestic K-13 diploid and K-29 tetraploid, and introduced Tetraflorum tetraploid) were investigated in two years" trials, with and without spring N-fertilizing. The results of this investigation showed that the high quality of Italian ryegrass seed could be achieved with two cuttings in the first production year. Spring N-application did not influence TSW (thousand seed weight), germination rate and total germination. The produced seed from the first harvest cut was of an excellent quality, with high germination rate (K-13 - 79%, K-29 - 88% and Tetraflorum - 87%) and total germination (K-13 - 91%, K-29 - 96% and Tetraflorum - 93%). The difference in TSW was obtained between diploid and tetraploids (in the average 2,81 gr in proportion to 4,56 and 4,84 gr). The seed produced from the second harvest cut had lower germination and TSW. [ABSTRACT FROM AUTHOR]