The aim was to determine the source and concentration of Si that results in greater accumulation of this element, thereby improving the physiological variables and dry matter production of cotton plants. The experiment was conducted in a greenhouse using a randomized block design in a 4 × 4 factorial scheme consisting of four silicon sources: sodium and potassium silicate stabilized with sorbitol (SiAl), monosilicic acid stabilized with PEG400 (SiAc); nanosilica (Nano), and potassium silicate without stabilizers (SiK); and four silicon concentration (0.0; 0.3; 0.6; and 0.8 g L−1), in four repetitions. Leaf Si was supplied in four phenological stages. With a view to determining the homogeneity of the spray solution with Si in the sources used, the solution underwent a polymerization test. The boll and the shoot of the plants were collected, washed, dried, and weighed, and the shoot samples were ground to analyze Si content. Foliar spraying of Si is agronomically viable for the cotton plant since it increases Si accumulation, pigment production and quantum efficiency of photosystem II, and decreased initial and maximum fluorescence, favoring the production of dry matter and boll + seeds. Silicon in the form of sodium and potassium silicate stabilized with sorbitol performed best at a concentration of 0.8 g L−1 of Si in comparison with other sources studied.

中文翻译：

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不同叶面硅源对棉花植株的影响

目的是确定导致该元素更多积累的 Si 的来源和浓度，从而改善棉花植物的生理变量和干物质产量。实验在温室中使用随机区组设计在 4 × 4 因子方案中进行，由四种硅源组成：用山梨糖醇 (SiAl) 稳定的硅酸钠和硅酸钾，用 PEG400 (SiAc) 稳定的单硅酸；纳米二氧化硅 (Nano) 和不含稳定剂的硅酸钾 (SiK)；和四个硅浓度（0.0；0.3；0.6；和 0.8 g L-1），重复四次。叶 Si 分四个物候阶段供应。为了确定所用源中含有 Si 的喷雾溶液的均匀性，对该溶液进行了聚合试验。收集植物的棉铃和枝条，清洗，干燥，称重，将芽样品研磨以分析Si含量。Si 的叶面喷洒对棉花植株在农艺上是可行的，因为它增加了 Si 积累、色素生产和光系统 II 的量子效率，并降低了初始和最大荧光，有利于干物质和棉铃 + 种子的生产。与其他研究来源相比，用山梨糖醇稳定的硅酸钠和硅酸钾形式的硅在 0.8 g L-1 的 Si 浓度下表现最佳。有利于生产干物质和棉铃 + 种子。与其他研究来源相比，用山梨糖醇稳定的硅酸钠和硅酸钾形式的硅在 0.8 g L-1 的 Si 浓度下表现最佳。有利于生产干物质和棉铃 + 种子。与其他研究来源相比，用山梨糖醇稳定的硅酸钠和硅酸钾形式的硅在 0.8 g L-1 的 Si 浓度下表现最佳。