Effect of applying different irrigation frequencies on the productivity and post-harvest of sugar beet under water and saline stress

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ABSTRACT The adoption of irrigation frequencies combined with the use of brackish water in semi-arid regions can reduce the deleterious effects of salt and water stress. Thus, the objective of this study was to evaluate the effect of irrigation frequencies using water with higher and lower salinity on the agronomic performance, productivity, and quality of sugar beet roots. The experiment was conducted at the experimental station of the Universidade da Integração Internacional da Lusofonia Afro-Brasileira, Redenção, Ceará, Brazil. A completely randomized design was used in a 5x2 factorial layout, referring to five irrigation frequencies (F1 = daily irrigation; F2 = irrigation every two days; F3 = irrigation every three days; F4 = irrigated every four days; and F5 = irrigated every five days) and two electrical conductivities of the irrigation water (0.8 and 6.0 dS/m), with 6 replicates. Irrigation frequency every five days negatively affected beet crop performance in terms of plant height, root length, and root diameter. Increasing the irrigation frequency to every four days reduced leaf area, dry matter of the aboveground and root parts, and yield, although to a lesser extent in the treatment with water of lower salinity. Irrigation every five days, combined with salt stress, was more efficient than the control treatment in terms of yield and soluble solids.

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