Research has shown the occurrence of the hormesis effect in some upland rice cultures resulting from low-dose application of glyphosate. Glyphosate herbicide is widely used in Brazilian agriculture for controlling the large quantity of weeds. The aim of this work was to verify the effects of low-dose application of glyphosate herbicide on agronomic characteristics in upland rice. The experimental design used was randomized blocks comprising five low-dose applications of glyphosate herbicide (10, 20, 40, 70, and 100 g acid equivalent [a.e.] ha⁻¹) and the control, in two stages of development of the rice culture (tillering [V4] and floral differentiation [R1]) with four repetitions. The agronomic traits of upland rice were evaluated. Data were subjected to variance analysis, polynomial regression analysis for the quantitative factor, and Tukey’s test for the qualitative factor at p < 0.05. The grain yield and the number of spikelets per panicle increased with the application of 10 g a.e. ha⁻¹ of glyphosate at the floral differentiation stage. Until the low dose of 75 g a.e. ha⁻¹, there was an increase in the number of panicles. Low doses between 70 and 100 g a.e. ha⁻¹ applied in R1 provided less spikelets per panicle, lower 100-grain weight, and lower grain yield. The leaf flavonoid content increased due to the increase in the low doses of glyphosate herbicide.

研究表明，由于低剂量施用草甘膦，在一些旱稻栽培中会出现兴奋效应。草甘膦除草剂在巴西农业中广泛用于控制大量杂草。这项工作的目的是验证低剂量施用草甘膦除草剂对旱稻农艺性状的影响。所使用的实验设计是随机分组，包括五种低剂量草甘膦除草剂（10、20、40、70 和 100 g 酸当量 [ae] ha ^-1) 和对照，在水稻培养的两个发展阶段（分蘖 [V4] 和花分化 [R1]），重复四次。对旱稻农艺性状进行评价。对数据进行方差分析、定量因素的多项式回归分析和定性因素的 Tukey 检验（p  < 0.05）。在花分化阶段，随着施用 10 g ae ha ^-1草甘膦，籽粒产量和每穗小穗数增加。直到 75 g ae ha ^-1的低剂量，穗数才增加。70 到 100 g ae ha ^-1之间的低剂量在 R1 中施用可提供较少的每穗小穗、较低的 100 粒重和较低的籽粒产量。由于草甘膦除草剂的低剂量增加，叶黄酮含量增加。