Silicon (Si) applied via foliar on pre-sprouted sugarcane seedlings is a practical alternative for supplying Si, however, it is necessary to use an adequate Si source and optimal concentration, but this information is unknown. This study evaluates the effect of alternative Si sources applied via foliar spraying at lower concentrations in relation to potassium silicate, on Si accumulation and the beneficial effects on pre-sprouted sugarcane seedlings and initial growth. Two experiments were carried out in a greenhouse, one in the production phase of pre-sprouted seedlings and the other in the initial growth phase of sugarcane grown in pots. Both experimental designs were randomized blocks with treatments arranged in a 4 × 5 factorial scheme, with four Si sources: nanosilica (Si-nano), monosilicic acid stabilized with PEG-400 (Si-acid), sodium and potassium silicate stabilized with sorbitol (Si-alkali) and potassium silicate (Si-K) in five concentrations (0, 0.25, 0.5, 0.75 and 1.0 mmol L⁻¹), and 4 repetitions. The Si syrup pH was adjusted to 5.5 ± 0.2. The foliar spraying of Si on pre-sprouted sugarcane seedlings is feasible since it increased Si accumulation, and benefited seedling production and plant initial growth. Soluble Si sources with stabilizers increased Si accumulation more efficiently compared to potassium silicate (Si-K) and nanosilica (Si-nano). Plants that have been sprayed with the PEG-400-stabilized monosilicic acid (Si-acid) and the sorbitol-stabilized sodium and potassium silicate (Si-alkali) at 0.5 and 0.6 mmol L⁻¹ concentrations, respectively, promote had greater Si accumulation and beneficial effects in the growth of pre-sprouted sugarcane seedlings in production phase. In the initial growth of sugarcane, the sources Si-acid and S-alkali also increase the buildup and beneficial effects, but both sources at 0.6 mmol L⁻¹ concentrations.

中文翻译：

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预先播种的甘蔗幼苗对叶面喷施硅酸钾，硅酸钠和钾，纳米二氧化硅和单硅酸的反应

通过叶面施用在预萌芽的甘蔗幼苗上的硅（Si）是供应Si的实用替代方法，但是，有必要使用足够的Si源和最佳浓度，但是此信息尚不清楚。这项研究评估了通过叶面喷施相对于硅酸钾而言较低浓度的替代硅源对硅积累的影响，以及对预发芽甘蔗幼苗和初始生长的有利影响。在温室中进行了两项实验，一项是在预萌芽苗的生产阶段，另一项是在盆栽甘蔗的初始生长阶段。两种实验设计均为随机区组，以4×5因子方案进行处理，具有四个Si源：纳米二氧化硅（Si-nano），用PEG-400稳定的单硅酸（Si-acid），^-1），并重复4次。将硅糖浆的pH调节至5.5±0.2。在预萌芽的甘蔗幼苗上叶面喷施硅是可行的，因为它增加了硅的积累，并有利于幼苗生产和植物的初期生长。与硅酸钾（Si-K）和纳米二氧化硅（Si-nano）相比，具有稳定剂的可溶性Si源可更有效地增加Si的积累。用0.5和0.6 mmol L ^-1的PEG-400稳定的单硅酸（Si-acid）和山梨糖醇稳定的硅酸钠和硅酸钾（Si-碱）喷雾的植物浓度的促进剂分别在生产期对预萌芽甘蔗幼苗的生长具有更大的硅积累和有益作用。在甘蔗的初始生长中，Si-酸和S-碱的来源也增加了积累和有益作用，但是这两种来源的浓度均为0.6 mmol L ^-1。