ABSTRACT Beetroot, when cultivated in hot regions such as the Brazilian semi-arid, is subjected to various stressful environmental factors that can negatively impact its productivity and quality. Silicon is an element known for its ability to mitigate damage caused by both abiotic and biotic stressors and is recognized as a productivity and quality enhancer in agricultural crops. Therefore, this study aimed to evaluate the effects of silicon application on the agronomic performance of the beet crop. The experimental design used was a randomized block design in a 5 x 2 factorial arrangement with four replications, comprising five silicon doses (0.0; 0.9; 1.8; 2.7, and 3.6 kg ha-1) and two table beet cultivars (Fortuna and Maravilha). The assessed variables included plant height, number of leaves per plant, polar and equatorial diameter of the tuberous root, tuberous root, shoot and total dry matter mass, commercial, non-commercial, and total productivity, as well as quality assessment of the root with determinations of pH, vitamin C, titratable acidity, and total soluble sugars. A silicon dose of 2.56 kg ha-1 promoted optimal root development in the Fortuna cultivar; however, silicon application at all tested doses reduced the levels of soluble sugars, while a dose of 3.6 kg ha-1 increased total titratable acidity. In contrast, silicon did not infl uence root development in the Maravilha cultivar, but an application of 3.13 kg ha-1 increased the total soluble sugar content by 86.13%. Beetroot semiarid, semiarid semi arid, arid semi-arid crops Therefore crop replications 0.0 00 0 (0.0 0.9 09 9 1.8 18 1 8 27 7 2.7 36 3 6 3. ha1 ha Maravilha. . Maravilha) height mass commercial noncommercial, noncommercial non non-commercial pH C acidity sugars 256 56 2.5 ha- cultivar however contrast 313 13 3.1 8613 86 86.13% 0. (0. 1. 2. 25 31 861 86.13 (0 86.1 ( 86.

RESUMO Não há na literatura recomendações de adubação com manganês (Mn) para beterraba estabelecidas no semiárido brasileiro. Objetivou-se avaliar o desempenho agronômico de beterraba fertirrigada manganês em Mossoró, RN. Foram desenvolvidos experimentos na Fazenda Experimental Rafael Fernandes nos anos de 2019 e 2021, delineados em blocos casualizados completos com cinco tratamentos (0, 3,0, 6,0, 9,0 e 12,0 kg ha-1 de Mn) e quatro repetições. Houve aumento no teor de Mn na diagnose foliar com a adubação. O acúmulo de massa seca e o número de folhas não diferiram estatisticamente em função das doses. A maior produtividade total (21,59 t ha-1) e comercial (20,55 t ha-1) de raiz tuberosa foi obtida com 6,0 kg ha-1 de Mn. O efeito deletério do excesso de Mn foi expresso na menor produtividade total e comercial de beterraba adubada com mais que 6,0 kg ha-1 de Mn. O Mn acumulado na raiz tuberosa não foi influenciado pela adubação. Nas folhas e na planta inteira, o acúmulo máximo ocorreu na dose 12,0 kg ha-1 de Mn. O Mn não influenciou no conteúdo de sólidos solúveis, mas reduziu o pH e, a raiz tuberosa das plantas adubadas com 6,0 kg ha-1 de Mn, dose com maior produtividade total e comercial, tiveram menor teor de açúcares solúveis. Recomenda-se adubação com 6,0 kg ha-1 de Mn para a cultura da beterraba. (Mn brasileiro Objetivouse Objetivou se Mossoró RN 201 2021 0, 0 (0 30 3 3,0 60 6 90 9 9, 120 12 12, ha1 ha 1 ha- repetições doses 21,59 2159 21 59 (21,5 20,55 2055 20 55 (20,5 6, inteira solúveis Recomendase Recomenda 202 ( 3, 21,5 215 2 5 (21, 20,5 205 (20, 21, (21 20, (20 (2

ABSTRACT No study has investigated the fertilization of beet with manganese (Mn) in the Brazilian semi-arid region. In this study, we evaluated the agronomic performance of manganese fertigated beet in Mossoró, Rio Grande do Norte. The experiments were conducted at Fazenda Experimental Rafael Fernandes in 2019 and 2021, and the study had a complete randomized block design with five treatments (0, 3, 6, 9, and 12 kg ha-1 Mn) and four replications. The Mn content increased in foliar diagnosis with fertilization. The accumulation of dry mass and the number of leaves did not differ significantly as a function of the dose. The highest total (21.59 t ha-1) and commercial (20.55 t ha-1) yields of tuberous roots were obtained with 6 kg ha-1 Mn. The adverse effects of excess Mn were expressed in the lower total and commercial productivity of beet fertilized with more than 6 kg ha-1 Mn. The accumulation of Mn in the tuberous roots was not affected by fertilization. In the leaves and the whole plant, the maximum accumulation occurred when 12 kg ha-1 Mn was applied. Although Mn did not influence the content of soluble solids, the pH of the tuberous roots of plants fertilized with 6 kg ha-1 Mn decreased, and the dose with the highest total and commercial productivity had a lower content of soluble sugars. Our findings suggest that treatment with 6 kg ha-1 Mn is optimum for the beet crop. (Mn semiarid semi arid region Mossoró Norte 201 2021 0, 0 (0 3 9 1 ha1 ha ha- replications 21.59 2159 21 59 (21.5 20.55 2055 20 55 (20.5 plant applied solids decreased sugars crop 202 ( 21.5 215 2 5 (21. 20.5 205 (20. 21. (21 20. (20 (2