Can 2,4-D promote the hormesis effect in upland rice?

• Published in: Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Vol. 57; no. 8; pp. 680 - 685
• Main Authors: Marsala, Leonardo, Oliveira Cunha, Matheus Luís, do Nascimento, Vagner, Pereira Prado, Evandro, da Silva Viana, Ronaldo, Ferrari, Samuel
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 03.08.2022; Taylor & Francis Ltd
• Subjects: 2,4-D; 2,4-Dichlorophenoxyacetic Acid - metabolism; Crop growth; Crop Production; Crop yield; Height; herbicide; Herbicides; Hormesis; hormesis effect; Nitrogen; Oryza - growth & development; Oryza - metabolism; Plant Leaves; Random Allocation; Rice; Seeds; spikelet per panicle; yield; herbicide; spikelet per panicle; Height; hormesis effect; yield
• ISSN: 0360-1234; 1532-4109
• DOI: 10.1080/03601234.2022.2099687

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.