Study of Some Factors Influencing the Variability of Seed Yield from Lucerne

D. V. KERTIKOVA and T. S. KERTIKOV
Institute of Forage Crops, BG-5800 Pleven, Bulgaria

Abstract

KERTIKOVA, D. V and T. S. KERTIKOV, 2004. Study of some factors influencing the variability of seed yield from lucerne. Bulg. J. Agric. Sci., 10: 685-689

During the period 1998-2001 at the Institute of Forage Crops, Pleven a field trial was carried out with the purpose of estimating new lucerne varieties and populations by seed yield. An analysis of yield variability was made depending on biological factor, sward age, climatic characteristics and number of synthetic population generation. It was found that with increase of stand age the possibility for a higher seed yield did not decrease. Meteorological conditions had a greater importance for lucerne seeds formation than the stand age. The highest and most stable yield by years was obtained from the new lucerne variety Dara (approved in 2004). The seed yield was stable in the direction from Syn 1 to Syn 2 generation for the population having a larger number of parental components. With a smaller number and partly inbred parents, the seed yield was significantly higher for Syn 2 generation. The importance of structural elements for yield formation was in the following order: stem number per m2 > pod number per stem > pod fertility.

Key words: lucerne, seed yield, variability