THE EFFECT OF VARIETY MAINTENANCE SYSTEMS ON THE YIELD OF BREEDER ANDFOUNDATION SEED OF WINTER-WHEAT

Three systems of variety maintenance i.e. pedigree in spaced planting, pedigree in dense planting and a mass selection, called Jensen method were compared on two different cultivars GK Sagvari and Jubileynaja 5 0 on the basis of superelite (breeder seed) and elite (foundation seed ) yield performance. On the basis of the results it can be drawn, that all the three methods proved to be suitable for the maintenance of cu ltivars. Although the response of the varieties were different, For GK Sagvari a strict pedigree selection was successful, while for Jubiley naja 50 a mass selection was just enough. The second task examined was , that wich traits should be considered when the pedigree seed were mi xed for producing the breeder seed. It was found that the 1000 kernel mass and the seedling vigour was extremely important. This traits affe cted the yield of breeder seed in both cultivars. The third question e xamined was, that how many and what kind of sublines the pedigree seed should consists of. In the case of GK Sagvari it was found, that the yield of breeder seed was higher, when the high yielding subline compo nents were included in the pedigree seed. The best result was achived when the 7 best lines were blended in the pedigree seed. As for Jubile ynaja 50 such tendency was not found. The sublines of this cultivar sh owed extreme adaptability to the environments and the years. The concl usion can be drawn, that the number and kind of the sublines blended d epends upon the given cultivar.