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

Author(s)

Marsala, Leonardo ; Oliveira Cunha, Matheus Luis ; do Nascimento, Vagner ; Prado, Evandro Pereira ; Viana, Ronaldo da Silva ; Ferrari, Samuel

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMIN; v. 57, n. 8, p. 6-pg., 2022-07-12.

Abstract

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. (AU)

• FAPESP's process: 12/13317-0 - Nitrogen rates and growth regulator on the development and yield of rice cv. IAC 202 in the Vale do Ribeira - São Paulo State - Brazil
• Grantee: Leonardo Marsala
• Support Opportunities: Scholarships in Brazil - Scientific Initiation