Evaluation of the yield stability of durum wheat varieties grown in the Pazardzhik region

Abstract

The genotype-environment interaction and the stability of the yield of three varieties of durum wheat has been studied (Progress, Predel and Victoria), the varieties are created at the Field Crops Institute – Chirpan. The stability variances σi2 and Si2 have been calculated by Shukla, along with the ecovalence Wi by Wricke and the stability criterion YSi of Kang. The results indicate that according to YSi of Kang, the most stable variety is Progress with a normal period of sowing and two procedures of introduction of the nitrogen fertilizer, followed by Victoria with the same period of sowing and fertilization. The highest stability of the yield of grain coincided with the highest yield. The Progress variety yielded 3.88 t/ha for the first period of sowing and two times of nitrogen fertilizer introduction. The sowing periods have a greater impact on the grain yield with the Predel variety than the periods of input of the nitrogen fertilizer.