CuO particles can be used as an agrochemical with slow and controlled release of micronutrients but, their size-specific effects have not been well elucidated. In this study, soil-grown lettuce was exposed to CuO nanoparticles (nCuO) and CuO microparticles (μCuO) at 0, 200, and 400 mg Cu/kg for 60 days. At harvest, nCuO released 82.2% and 117.7% more Cu ions, as well as 48.7% and 75.3% more DTPA-extractable Cu than μCuO at 200 and 400 mg/kg, respectively. CuO treatments induced higher copper accumulated in lettuce roots but did not change shoot’s Cu content or cause oxidative stress. nCuO treatments increased shoot’s biomass by 16.3–19.1%, while μCuO showed no improvement to the biomass. The beneficial effects on lettuce by nCuO may be attributed to its modification in plant photosynthesis system with increased transpiration rate and higher stomatal conductance. Results indicate that nCuO can be a promising agrochemical fertilizer to increase crop production.

可以将CuO颗粒用作农药，可缓慢和控制地释放微量营养素，但尚未明确阐明其特定大小的作用。在这项研究中，土壤生长的生菜暴露于纳米CuO（Ñ的CuO）和CuO微粒（μ 0，200，和400毫克的Cu /公斤的CuO）60天。在收获时，Ñ的CuO释放82.2％和117.7％的Cu离子，以及48.7％和75.3％的DTPA-提取铜比μ分别的CuO在200和400mg / kg的，。CuO处理诱导了莴苣根中积累的较高的铜，但没有改变枝条中的Cu含量或引起氧化应激。n CuO处理使枝条的生物量增加16.3–19.1％，而μCuO没有显示出对生物量的改善。n CuO对生菜的有益影响可能归因于其在植物光合作用系统中的改良，具有蒸腾速率提高和气孔导度更高的特点。结果表明，n CuO是增加作物产量的有前途的农业化肥。