本研究旨在评估低剂量2,4-D对作物生长不同阶段施用的旱稻农艺性状的影响。这项工作是在随机的完全块中进行的,包括在水稻发育的两个阶段(分till和花分化)中施用5种低剂量的2,4-D除草剂(0、0.68、1.36、2.04、3.40和5.44g酸当量(e.a.)ha-1)。叶片中的氮含量,在分till期施用低剂量的2,4-D时,SPAD指数和产量较高。以2.04ga.eha-1的剂量施用2,4-D导致每穗小穗数量增加19%。另一方面,低剂量的2,4-D对身高没有影响,茎的数量,活跃的分till和100种子的重量。我们的结果有助于增加对植物中hormesis效应的了解,以提高作物产量。
This study aimed to evaluate the influence of low doses of 2,4-D on the agronomic traits of upland rice applied at different stages of crop growth. The work was carried out in a randomized completly blocks, and consisted of the application of 5 low doses of the 2,4-D herbicide (0, 0.68, 1.36, 2.04, 3.40 and 5.44 g acid equivalent (e.a.) ha-1) in two stages of rice development (tillering and floral differentiation). Nitrogen contentes in leaves, SPAD index and yield are higher when low doses of 2,4-D is applied in the tillering stage. Application of 2,4-D at a dose of 2.04 g a.e ha-1 results in a 19% increase in the number of spikelet per panicle. On the other hand, there is no effect of the application of low doses of 2,4-D on height, number of stems, active tillering and weight of 100 seeds. Our results contribute to increase knowledge of the hormesis effect in plants in order to increase crop yield.