Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Hristo STOYANOV, Stefka STEFANOVA-DOBREVA, Angelina MUHOVA
In order to determine suitable combinations between genotypes and agronomy practices based on productivity, stability and adaptability, four triticale genotypes (Kolorit, Bumerang, Respekt and Atila) were studied in three contrasting growing periods and under four levels of nitrogen fertilization. The productivity, stability and adaptability were determined by using the method of Eberhart and Russell and by AMMI analysis. Cultivar Bumerang was with the highest productivity, in all levels of nitrogen fertilization, while cultivar Respekt was with the lowest yields. A tendency was observed toward higher effect of the genotype, while the effect of the year conditions decreased with the higher nitrogen nutrition; the effect of the genotype x environment remained almost constant. The highest stability, averaged for this experiment, was that of cultivar Bumerang, and the lowest - of cultivar Kolorit. With the exception of the variant without nutrition, both cultivars had a comparatively stable response to the other nitrogen norms, which makes them suitable for growing under the soil and climatic specificity of Bulgaria at varied nutrition regimes.
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