Abstract Field experiments were conducted to evaluate the response of rainfed wheat (Triticum aestivum L.) to foliar copper (Cu) application in correcting Cu deficiency in calcareous soils. Two native soil Cu contents were tested in successive growing seasons. The soil “1” contained 0.35 mg kg−1 of Cu (Diethylenetriamine Pentaacetic Acid extraction). It was evaluated during the 2016-17 season. The soil “2” contained 0.61 mg kg−1. It was studied during the 2017-18 season. The rainfall amount was around 289 mm and 429 mm, respectively, for 2016-17 and 2017-18 seasons. For the soil “1”, the Cu treatments were: control, 0.2%, 0.4%, 0.6%, 0.8%, and 1%. For the soil “2”, the Cu tested levels were: control, 0.01%, 0.03%, 0.05%, 0.1%, and 0.2%. Cu was applied at the early boot growth stage in the sulfate form. The results showed that the response of grain yield to Cu foliar feeding was not related to the tested native soil Cu content. A significant grain yield increase, due to Cu spray, was revealed during the rainfall season (429 mm) in soil “2”. This increase was around 8% at 0.018% of Cu compared to control. However, Cu foliar application higher than 0.03% induced leaf damage. The Cu content of flag leaf and kernels showed a linear response to Cu supply. Flag leaf Cu content was around 5 mg kg−1 in control and exceeded 30 mg kg−1 at Cu application over than 0.03%.

中文翻译：

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叶面喷铜防治钙质土壤雨养小麦（Triticum aestivum L.）缺铜的效果

摘要 进行了田间试验，以评估雨养小麦（Triticum aestivum L.）对叶面喷施铜（Cu）在纠正钙质土壤铜缺乏方面的反应。在连续的生长季节测试了两种原生土壤铜含量。土壤“1”含有 0.35 mg kg-1 的铜（二乙烯三胺五乙酸提取物）。它在 2016-17 赛季进行了评估。土壤“2”含有 0.61 mg kg-1。它在 2017-18 赛季进行了研究。2016-17 和 2017-18 季节的降雨量分别约为 289 毫米和 429 毫米。对于土壤“1”，Cu 处理为：对照、0.2%、0.4%、0.6%、0.8% 和 1%。对于土壤“2”，Cu 测试水平为：对照、0.01%、0.03%、0.05%、0.1% 和 0.2%。铜在早期的靴子生长阶段以硫酸盐形式施用。结果表明，谷物产量对铜叶面饲喂的响应与测试的原生土壤铜含量无关。在土壤“2”的降雨季节（429 毫米）期间，由于喷施铜，谷物产量显着增加。与对照相比，在 0.018% 的铜时，这种增加约为 8%。然而，铜叶面喷施量高于 0.03% 会导致叶片损伤。旗叶和籽粒的铜含量对铜供应呈线性响应。旗叶铜含量在对照中约为 5 mg kg-1，在铜应用超过 0.03% 时超过 30 mg kg-1。铜叶面喷施量高于 0.03% 会引起叶片损伤。旗叶和籽粒的铜含量对铜供应呈线性响应。旗叶铜含量在对照中约为 5 mg kg-1，在铜应用超过 0.03% 时超过 30 mg kg-1。铜叶面喷施量高于 0.03% 会引起叶片损伤。旗叶和籽粒的铜含量对铜供应呈线性响应。旗叶铜含量在对照中约为 5 mg kg-1，在铜应用超过 0.03% 时超过 30 mg kg-1。