Abstract

Plant growth can be stimulated by low doses of glyphosate. The objective of this work was to evaluate the effect of low doses of glyphosate and sowing season on the growth of the early cycle common bean. Two experiments were conducted in the field, the first in the winter and the second in the wet season, with the early cycle common bean cultivar IAC Imperador. The experimental design was a randomized complete block design, consisting of low doses of glyphosate applied on phenological stage V₄, with four replications. Environmental conditions, such as air temperature, interfered in the early cycle common bean response to low doses of glyphosate. In the winter season, a dose of 36 g a.e. ha⁻¹ promoted growth in the common bean, and a dose of 7.2 g a.e. ha⁻¹ improved the harvest index. In the wet season, there was no growth stimulus, and the harvest index increased with a dose of 36 g a.e. ha⁻¹. The harvest index was the only characteristic improved in both seasons, but with different doses. Our study indicates that growth characteristics of early cycle common bean are stimulated by low doses of glyphosate, but this response is dependent on the growing environment.

 抽象的

低剂量的草甘膦可以刺激植物生长。这项工作的目的是评估低剂量草甘膦和播种季节对早熟菜豆生长的影响。我们在田间进行了两次试验，第一次在冬季，第二次在雨季，试验对象为早周期普通豆品种 IAC Imperador。实验设计是随机完全区组设计，包括在物候阶段V ₄施用低剂量的草甘膦，并进行四次重复。环境条件（例如气温）会干扰普通豆对低剂量草甘膦的早期反应。冬季，36 g ae ha ^-1剂量促进菜豆生长，7.2 g ae ha ^-1剂量提高收获指数。在雨季，没有生长刺激，收获指数随着剂量36 g ae ha ^-1的增加而增加。收获指数是两个季节唯一有所改善的特征，但剂量不同。我们的研究表明，低剂量的草甘膦会刺激早期四季豆的生长特性，但这种反应取决于生长环境。