Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 57, Issue 8, Pages 680-685Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2022.2099687
Keywords
Height; herbicide; hormesis effect; spikelet per panicle; yield
Funding
- Sao Paulo Research Foundation (FAPESP) [12/13317-0]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [12/13317-0] Funding Source: FAPESP
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This study evaluated the influence of low doses of 2,4-D on the agronomic traits of upland rice. The results showed that applying low doses of 2,4-D during the tillering stage can increase nitrogen content, SPAD index, and yield. Applying 2.04 g a.e ha(-1) of 2,4-D resulted in a 19% increase in the number of spikelets per panicle.
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.
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