Our objective was to assess the feasibility of foliar spraying of boron (B) with the addition of silicon (Si) to the spray solution and its effects on the alleviation of oxidative stress and physiological damages induced by B deficiency in cauliflowers. An experiment was carried out between March and August 2019 with cauliflower plants of the cultivar Quatro Estações. Treatments comprised four B concentrations (0, 0.11, 0.25, and 0.42 g L⁻¹), as well as the absence and presence of Si (12 mmol L⁻¹). Boric acid (17.5% B) was used as a source of B. Potassium silicate (115.2 g L⁻¹ Si and 113.85 g L⁻¹ K₂O) (SiK₂O₃) stabilized with sorbitol was used as a source of Si. During the experiment, nine foliar applications were carried out every 10 days, using a manual sprayer. The absorption of B by cauliflower leaves increased when silicon was added to the spray solution. Moreover, Si addition relieved oxidative stress by decreasing MDA and H₂O₂ contents and increasing phenolic compounds and ascorbic acid. Si addition also improved leaf tissue firmness, photosynthetic pigment production, PSII quantum efficiency, and hence plant growth. As a conclusion, adding Si to the foliar spray solution of B is feasible for growing of cauliflowers.

我们的目的是评估叶面喷洒硼 (B) 并在喷雾溶液中添加硅 (Si) 的可行性及其对减轻由花椰菜中 B 缺乏引起的氧化应激和生理损伤的影响。2019 年 3 月至 8 月期间，对栽培品种 Quatro Estações 的花椰菜植物进行了一项实验。处理包括四种 B 浓度（0、0.11、0.25 和 0.42 g L ^-1），以及 Si 的不存在和存在（12 mmol L ^-1）。硼酸（17.5% B）用作 B. 硅酸钾（115.2 g L ^-1 Si 和 113.85 g L ^-1 K ₂ O）（SiK ₂ O ₃) 用山梨糖醇稳定用作 Si 源。在实验过程中，使用手动喷雾器每 10 天进行 9 次叶面喷施。当向喷雾溶液中加入硅时，花椰菜叶子对 B 的吸收增加。此外，添加Si通过降低MDA和H ₂ O ₂含量以及增加酚类化合物和抗坏血酸来减轻氧化应激。Si 的添加还提高了叶组织的硬度、光合色素的产生、PSII 量子效率，从而提高了植物的生长。综上所述，在 B 的叶面喷雾溶液中添加 Si 对花椰菜的生长是可行的。