Estratégias de manejo de plantas daninhas em arroz de terras altas

Abstract

Weeds are among the main factors limiting upland rice production, making the adoption of management strategies that ensure high control efficacy and crop selectivity essential. In this context, the objective of this study was to consolidate and expand knowledge on weed management in upland rice through a review article and a field experiment conducted over two growing seasons to evaluate different herbicide combinations. The literature review addressed the main aspects of weed management in upland rice, emphasizing the importance of integrating different control strategies to reduce weed interference and promote crop development. It also discussed the limitations resulting from the limited availability of herbicides registered for upland rice, highlighting the need for further research aimed at developing more efficient, selective, and sustainable management alternatives. The field experiment was conducted during the 2023/2024 and 2024/2025 growing seasons to evaluate different combinations of pre- and post-emergence herbicides for weed management. Herbicide treatments influenced several agronomic traits, particularly grain yield, crop phytotoxicity, days to flowering, severity of some diseases, and grain chalkiness, whereas milling yield and head rice yield were not affected. Combinations containing pendimethalin combined with bentazon provided high grain yield, adequate crop selectivity, and represented a promising alternative for the chemical management of upland rice. The results obtained expand knowledge on weed management in upland rice and contribute to improving management strategies by providing support for the development of more efficient, selective, and sustainable chemical management programs, with the potential to contribute to crop productivity.