The aim of this study was to evaluate, through nonlinear regression models, the initial development of soybean (Glycine max L. Merr. cv. BRS 257) in soil supplemented with different copper levels. The experiment was performed in a greenhouse under natural light and temperature conditions. The seeds were sowed in soil containing different copper levels (11.20, 32.28, 52.31, 64.51, 79.42, 117.70, 133.53, 144.32, or 164.00 mg kg^− 1). Germination percentage was not affected by the increase of copper content in the soil, but there was a delay in the germination process. There was no influence of copper levels on the seedling emergence speed index until 98.42 mg kg^− 1; however, higher copper amounts reduced this parameter. Low copper concentrations increased plant development, but higher concentrations compromised mainly root growth. Overall, these results suggest that copper supplementation in the soil exerted dose-dependent dual effects on soybean seedlings.

本研究的目的是通过非线性回归模型评估大豆（ Glycine max L. Merr. cv. BRS 257）在补充不同铜含量的土壤中的初始发育情况。实验在自然光和温度条件下的温室中进行。将种子播种在含有不同铜含量（11.20、32.28、52.31、64.51、79.42、117.70、133.53、144.32 或 164.00 mg kg ^{- 1} ）的土壤中。发芽率不受土壤中铜含量增加的影响，但发芽过程出现延迟。铜水平在98.42 mg kg ⁻¹之前对出苗速度指数没有影响；然而，较高的铜含量会降低该参数。低铜浓度促进植物发育，但较高浓度主要损害根部生长。总体而言，这些结果表明土壤中铜的补充对大豆幼苗产生剂量依赖性双重效应。