Productivity and economic traits of winter oilseed rape (Brassica napus var. biennis) under the conditions of Dobrudzha

G. Georgiev, G. Georgiev, P. Chamurliyski
Abstract. During the last decade oilseed rape has become a main field crop in Bulgaria. In 2001, about 240 thousand ha were sown with this crop, mainly with foreign varieties and hybrids. The increasing demand and the large market for this oil seed crop has lead to introduction of new varieties of different production potential and economic indices. The aim of this investigation was to study the main economic indices related to yield formation and the production potential of winter oil seed rape cultivars under the conditions of Dobrudzha region. The investigation was carried out during 2009 – 2010 in the trial field of Dobrudzha Agricultural Institute (DAI). A total of 23 cultivars of winter oil seed rape were tested. The materials were obtained from international genetic stock centers and foreign companies: Gatersleben (Germany), Institute of Plant and Genetic Resources (Sadovo, Bulgaria), Limagrain (France), NPZ (Germany) and Novi Sad (Serbia). The trials were performed in three replications according to the Latin square design, the harvest plot area being 10 m2. Variety Rasmus was used as a standard. Yield and productivity elements were investigated. Two-factor dispersion analysis, and variation and correlation analyses were applied for statistical processing of the results, using software XLSTAT Pro. ver 7.0.1. Varieties Ilia and Anna demonstrated high and stable yield during the two years of investigation, reaching 5.12 t/ha and 4.93 t/ha, respectively. The highest values of the trait 1000 seed weight were measured in Kata (4.66 g) and Catalina (4.51 g). Varieties Kata and Branka significantly exceeded the standard Rasmus by number of pods per plant. Kata, Ilia and Branka can be considered suitable initial material for breeding programs aimed at developing new synthetic winter varieties of oilseed rape possessing excellent economic traits and high productivity.