Although predominates in many soils, compared to , the fluctuations in the forms and concentrations of N can expose to N deficiency in plants in general and toxicity in sensitive plants. However, a strategy to mitigate nutritional disorders of N is to utilize Si. We aimed to verify if Si attenuates N deficiency and toxicity in cotton plants grown in nutrient solution. The treatments followed a 5 × 2 factorial scheme, with five concentrations of (1.0; 7.5; 15.0; 22.5 and 30.0 mmol/L) combined with the absence and presence of Si (1 mmol/L), arranged in a completely randomized design with four replications. Without Si, the largest shoot dry mass occurred at 16 mmol/L , increased by 47%, compared to 1 mmol/L and decreased by 37% compared to 30 mmol/L . With Si, the largest shoot dry mass was observed at 20 mmol/L , increased by 52% compared to 1 mmol/L and decreased by 14% compared to 30 mmol/L . In addition, in the highest concentration of , plants with Si exhibited a higher shoot dry mass relative to plants with no Si supplementation due to decreased electrolyte leakage index and increased use efficiency of N and K. Cotton plants were tolerant to high concentrations (≈15 mmol/L). Si attenuates abiotic stress caused by toxicity (30 mmol/L) but not N deficiency in cotton plants.

中文翻译：

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硅减轻棉花植株铵中毒引起的非生物胁迫，但不能减轻氮缺乏

虽然在许多土壤中占主导地位，但与 相比，N 的形式和浓度的波动可以使植物普遍缺乏 N 和敏感植物的毒性。然而，减轻氮营养障碍的一种策略是利用硅。我们的目的是验证 Si 是否可以减轻在营养液中生长的棉花植株的N 缺乏和毒性。处理遵循 5 × 2 因子方案，五个浓度（1.0；7.5；15.0；22.5 和 30.0 mmol/L）与 Si 的不存在和存在（1 mmol/L）相结合，以完全随机的设计排列四次复制。在没有 Si 的情况下，最大的芽干质量出现在 16 mmol/L 时，与 1 mmol/L 相比增加了 47%与 30 mmol/L 相比下降了 37% 。对于 Si，在 20 mmol/L 时观察到最大的芽干质量，与 1 mmol/L 相比增加了 52%，与30 mmol/L 相比减少了 14% 。此外，在最高浓度的，由于电解质泄漏指数降低和 N 和 K 的利用效率增加，Si 植物相对于未添加 Si 的植物表现出更高的芽干质量。 棉花植物耐受高浓度（≈15毫摩尔/升）。Si 减轻由毒性 (30 mmol/L) 而不是 N 缺乏引起的棉花植物的非生物胁迫。