ASSESSMENT OF PERFORMANCE AND STABILITY FOR YIELD AND QUALITY OF SOME SUGAR BEET GENOTYPES UNDER TWO HARVESTING DATES

doi:10.12816/ejpb.2019.256689

ASSESSMENT OF PERFORMANCE AND STABILITY FOR YIELD AND QUALITY OF SOME SUGAR BEET GENOTYPES UNDER TWO HARVESTING DATES

Document Type : Original research

10.12816/ejpb.2019.256689

Abstract

Evaluation of sugar crops varieties at different environmental conditions comes in the first order in Egypt for, sugar beet genotypes where the Egyptian climatic conditions are unfavorable for its floral induction. A comparative study was conducted to assess the performance and stability of five exotic sugar beet varieties (Sarah, Glorius, Carnute, Gazelle and Dema poly) in three locations (Kafr Elsheikh, El-Giza and Elminia governorates) for two harvest age (180 and 210 days) during the two successive growing seasons 2016/17 and 2017/18.The combinations between three locations, two harvest age and two seasons were considered as 12 different environments. A split plot design in randomized complete blocks arrangement with three replications was used. The results of combined analysis of variance revealed that the main effects of growing seasons (Y), locations (L) and harvest age (H) were significant for all studied yield and technological characters except sodium and nitrogen percentages in roots. Meantime, the variances due to genotypes were significant for all studied characters. Moreover, Sarah and Glorious varieties had the highest mean values for root yield/fed. Besides, in Kafr El-Sheikh, harvesting after 210 days from sowing proved the superiority of those two varieties as commercial or suitable varieties for cultivation under desirable conditions. The results for stability analysis showed that the genotype Sarah had the most stable and highest yields of root and sugar as well as quality traits followed by Glorious. Since it exhibit relative high mean performance for these traits and had regression coefficient (b_i) approaching unity with insignificant deviations from regression (S²_di =.0.0), indicating the importance of these varieties in agricultural practice as commercial varieties under such studied environmental conditions.

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