Can the application of low doses of paraquat induce the hormesis effect in upland rice?

Autor(es)

Ferrari, Samuel ^[1] ; Zanetti de Godoy, Dumon Ramiro ^[2] ; Oliveira Cunha, Matheus Luis ^[3] ; Prado, Evandro Pereira ^[1] ; Manzani Lisboa, Lucas Aparecido ^[1] ; dos Santos Cordeiro, Luis Fernando ^[1] ; Delovo Carara, Luis Guilherme ^[1] ; Alves de Oliveira, Lara Caroline ^[3]

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Coll Agr & Technol Sci, Dept Crop Prod, Dracena, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Registro, SP - Brazil

^[3] Sao Paulo State Univ UNESP, Coll Agr & Vet Sci, Via Acesso Prof Paulo Donato Castelane S-N, BR-14884900 Jaboticabal, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMIN; v. 56, n. 11 OCT 2021.
• Citações Web of Science: 0

Resumo

This study aimed to verify the effects of the application of paraquat low doses on the agronomic traits of upland rice in two different application modes. The treatments consisted of a combination of 6 low doses of the paraquat (0; 20; 40; 60; 80 and 120 g a.i. ha(-1)) and 2 application modes of low doses a) single application performed between active tillering and floral differentiation b) application split into four applications, the first being carried out at the beginning of active tillering, the second being carried out between active tillering and floral differentiation, the third application carried out after floral differentiation and the fourth application carried out after flowering with 25% of the dose in each application. The application of low doses of paraquat does not promote the hormesis effect of upland rice. The increase in the frequency of the plant to the herbicide caused by the splitting of applications negatively affected the plant height, number of spikelets per panicle, yield, leaf nitrogen and sulfur as the low doses levels were increased. On the other hand, there is no influence of paraquat low doses levels when single applied to the agronomic traits of upland rice. (AU)

• Processo FAPESP: 14/22725-0 - Efeito de subdoses e do modo de aplicação de paraquat no desenvolvimento da cultura do arroz de terras altas (IAC-202)
• Beneficiário: Dumon Ramiro Zanetti de Godoy
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica