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Two field experiments were conducted to evaluate the effect of foliar application of salicylic acid (SA) on the growth, yield and quality characters of five sugar beet varieties (MARWA KWS, SUGAR KING, MiRAGE, DREEMAN and ESTORA KWS) under two types of soil in the two different locations in Nubaria and Sakha regions during 2018/2019 and 2019/2020 seasons. The experiments were conducted in split-split plot design in the three replications, where the main plots assigned by the two soil types (sandy soil in Nubaria and clay soil in Sakha), while the subplots were occupied by the three foliar application concentrations of SA (control, 1000 and 2000 ppm) and the five sugar beet varieties (Marwa kws, Sugar king, Mirage, Dreeman and Estora kws) were allocated randomly the sub-subplots. The results revealed that the foliar application of 2000 ppm SA significantly influenced the top fresh mass and root biomass of sugar beet plants. Conversely, the increasing concentration of SA led to significant differences in fresh mass, sugar yield, and sucrose % as well as purity % of sugar beet in both seasons. The Dreeman and Estora kws exhibited better performance in terms of root length under Nubaria conditions. The interaction effect between the three factors gave the maximum levels of increment for most of the studied characters, particularly for the cultivar ESTORA KWS. [ABSTRACT FROM AUTHOR]

To investigate the effect of Abscisic acid (ABA) and storage period on yield and quality of the three sugar beet varieties, in this respect two field experiments were conducted at the Experimental Farm of Agricultural Station in Sabahia, Alexandria, Egypt during 2016/2017 and 2017/2018 seasons. A split-split plot design in three replications was used in both seasons, where the main plots were allocated by the three sugar beet varieties i.e. (Classic, Farida and Gloriosa), meanwhile, the sub plot was occupied by the four rates of Abscisic acid (ABA) (contra =water, 1000, 2000 and 3000 ppm) as foliar application one time before harvesting date, while storage periods (2, 4, 6, and 8 days after harvest) were occupied the sub-sub plots in both seasons. The obtained results revealed that there was a significant difference between the three sugar beet varieties to its response to the four concentration of Abscisic acid (ABA) under the three storage periods in yield, its components and quality, whereas the Classic variety recorded the highest mean values of these traits followed by Farida variety while the lowest ones recorded with Gloriosa variety in both seasons. Increasing ABA concentration up to 3000 ppm increased TSS (%), sucrose (%) and purity (%) in sugar beetroots, which recorded the highest mean values of these traits followed by 2000 ppm, while the lowest ones recorded with control treatments (water spray), storage period at 2 days after harvest, on the other side, storage period at 4 or 6 days were had in a significant difference in the two seasons. In general, sowing Classic variety gave the highest values of the studied characters with 2000 ppm ABA under storage period 2 -6 days after harvest in Alexandria conditions, Egypt. [ABSTRACT FROM AUTHOR]