Nitrogen fertilizer and fortified DPC (DPC⁺) chemical topping agent management is essential for replacing manual topping and achieving simplified cotton cultivation. However, the response of cotton physiological characteristics to the interaction between nitrogen fertilizer and DPC⁺ and the relationship between this interaction and yield remain unclear. A 2-year field experiment was conducted to investigate the effects of nitrogen rates (N₁, 150; N₂, 300; N₃, 450 kg ha⁻¹) and DPC⁺ doses (D₁, 450; D₂, 750; D₃, 1050 mL ha⁻¹) and D₀ (manual topping) on antioxidant enzymes, endogenous hormone content and balance, reproductive organ dry matter (RODM) and yield. N₁D₁, N₂D₂, and N₃D₃ significantly improved the RODM and yield, with N₂D₂ having 3.5 − 37.1% higher RODM levels than N₁D₁ and N₂D₂. At the N₁ level, D₁ decreased malondialdehyde (MDA) content by 4.1 − 35.6% compared to D₀, D₂ and D₃, and increased catalase (CAT) activity and abscisic acid (ABA) content by 69.7% and 34.2% than D₀, respectively. At the N₂ level, D₂ decreased the MDA content by 16.1 − 51.9% and increased peroxidase and CAT activity and ABA and gibberellic acid contents by 12.7 − 355.7% compared to D₀, D₁, and D₃. Furthermore, D₂ decreased indole-3-acetic acid (IAA) content and IAA/ABA by 12.1% and 30.5% in boll opening but increased trans-zeatin-riboside (ZR) content by 25.5% compared to D₀. At the N₃ level, D₃ increased ZR/ABA by 20.1% compared to D₀. Overall, the interactions between appropriate nitrogen levels and DPC⁺ doses can increase cotton yield by enhancing antioxidant enzyme activity and promoting endogenous hormone homeostasis, with N₂D₂ performing best.

氮肥和强化DPC（DPC ⁺）化学打顶剂管理是替代人工打顶、实现棉花简易栽培的关键。^{然而，棉花生理特性对氮肥与DPC +}相互作用的响应以及这种相互作用与产量之间的关系仍不清楚。进行了为期 2 年的田间试验，以研究施氮量（N ₁ , 150；N ₂ , 300；N ₃ , 450 kg ha ^-1）和 DPC ⁺剂量（D ₁ , 450；D 2 , 750；D ₂ , 750； D ₃ , 1050 mL ha ^-1 ) 和 D ₀（人工摘心）对抗氧化酶、内源激素含量和平衡、生殖器官干物质 (RODM) 和产量的影响。N ₁ D ₁、N ₂ D ₂和 N ₃ D ₃显着提高了 RODM 和产量，其中 N ₂ D _{2的 RODM 水平比 N 1} D ₁和 N ₂ D ₂高 3.5 - 37.1% 。在 N ₁水平，与 D ₀、D ₂和 D ₃相比，D _{1使丙二醛 (MDA) 含量降低了 4.1 - 35.6%}, 并且过氧化氢酶 (CAT) 活性和脱落酸 (ABA) 含量分别比 D ₀提高了 69.7% 和 34.2% 。在 N _{2水平上，与 D 0}、D ₁和 D ₃相比，D ₂使 MDA 含量降低 16.1 - 51.9%，并使过氧化物酶和 CAT 活性以及 ABA 和赤霉酸含量增加 12.7 - 355.7% 。_{此外，与 D 0}相比，D ₂使吐絮时吲哚-3-乙酸 (IAA) 含量和 IAA/ABA 含量降低了 12.1% 和 30.5%，但反式玉米素核糖苷 (ZR) 含量增加了 25.5% 。在N ₃水平，D ₃比D _{0增加了20.1%的ZR/ABA}. ^{总的来说，适当的氮水平和 DPC +}剂量之间的相互作用可以通过增强抗氧化酶活性和促进内源激素稳态来增加棉花产量，其中 N ₂ D ₂表现最好。