Abstract
The availability of herbicides registered for upland rice is still limited, increasing the management difficulty level for weeds under this crop system. The objective of this study was to evaluate the effect of the ALS inhibitors herbicides application, at different periods, on upland rice (cv. Cambara). The experimental design was randomized blocks with four replications, in a 5x3 factorial scheme, consisting of the herbicide treatments penoxsulam (36 g ha-1), bispiribaque-sodium (50 g ha-1), pirazossulfurom-ethyl (20 g ha-1), 2,4-D (670 g ha-1), and a control, and three application periods: 15, 30, and 45 days after emergence (DAE). Plant phytotoxicity, height, and dry biomass were evaluated at 7, 14, and 28 days after application (DAA), and also the number of panicles m-2, number of grains panicle-1, and yield. It was observed plant phytotoxicity and height decreasing only when applying bispiribaque-sodium, at 15 and 30 DAE. The plant dry biomass was not affected by herbicide application. The number of grains panicle-1 decreased only for pirazossulfurom-ethyl, at 45 DAE. Yield decreased with the pirazossulfurom-ethyl and penoxsulam application, at 45 DAE. Generally the best herbicide application period was 30 DAE.
Highlights
The availability of herbicides registered for upland rice is still limited, increasing the management difficulty level for weeds under this crop system
Seletividade de herbicidas inibidores de ALS em diferentes estádios de desenvolvimento do arroz de terras altas 409 em solos cultivados anteriormente com soja, tem proporcionado elevadas produtividades e rentabilidade ao produtor rural
4. Os herbicidas penoxsulan, bispiribaque-sódico e pirazossulfurom-etílico são boas alternativas no manejo de plantas daninhas, na cultura do arroz cv
Summary
1 M.O.: matéria orgânica. 2 V%: saturação por bases. 3 CTC: capacidade de troca catiônica. O delineamento experimental foi o de blocos ao acaso, com quatro repetições, em esquema fatorial 5x3, composto pelos tratamentos herbicidas penoxsulam (36 g ha-1), bispiribaque-sódico (50 g ha-1), pirazossulfurom-etílico (20 g ha-1), 2,4-D (670 g ha-1) e uma testemunha capinada e três épocas de aplicação: 15, 30 e 45 dias após a emergência (DAE). Observou-se efeito fitotóxico à cultura apenas quando da utilização do bispiribaque-sódico, aos 15 e 30 dias após a emergência (DAE) (Tabela 2). Os danos visuais às plantas, quando o herbicida foi aplicado aos 15 DAE, foram mais evidentes aos 7 dias após a aplicação (DAA), com 8% de injúria, caracterizada por leve clorose nas folhas. Altura das plantas de arroz, após a aplicação dos herbicidas, em diferentes épocas, após a emergência da cultura (Nova Xavantina, MT, safra 2009/2010)
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