- Kuneva1*, E. Valchinova2, A. Stoyanova3
1*Agricultural University, 4000 Plovdiv, Bulgaria,
2Institute of Plant Genetic Resources “К. Malkov”- Sadovo, Bulgaria
3Department of Plant Production, Faculty of Agriculture, Trakia University, 6000 Stara Zagora, Bulgaria
(Manuscript received 20 June 2017; accepted for publication 5 February 2018)
Abstract. The aim of the study is to evaluate comprehensively the rye collection and the possibilities for the specimen usage in selection on the basis of mathematical approaches. The study was carried out during 2009-2012 in the experimental field of the Institute of Plant Genetic Resources (IRGD) – town of Sadovo on cinnamon-forest soils with 54 specimens collected (16 samples from expeditions in Bulgaria and 38 samples from abroad). As standard, the Bulgarian variety “Millennium” (current standard in IASAS) was used. The Danae variety has been used as a former 30-year standard for the country. Evaluation of the impact of the examined specimens was made on the basis of the following biometrical indicators: spike length (cm); tillering – productive and non-productive tillering; plant weight (g); ears weight (g); weight of the main spike(g); weight of the main ear`s grain (g); number of the spikelets in the spike; grain weight of the main spike (g); crop index (%). The correlation analysis made allows determination of the dependence of the complexity impact on the rye performance indicators. The established correlations show the degree of impact of each indicator in yield formation. Based on the correlation coefficients derived, the established dependencies between plant seed yield and maturation yield elements, a mathematical model of the plant with high productive potential was obtained. Rye specimens of the highest yield are characterized by high value of the crop index.