BORON NUTRITION AND HERBICIDE STRATEGIES IN MANAGING GLYPHOSATE-RESISTANT PALMER AMARANTH IN Roundup ReadyÒ ALFALFA

Rogerio Furlan Junior; Thomas Mueller; Lawrence Steckel; Renata Oakes; Bruno Carneiro e Pedreira

doi:10.31413/

Autores

Rogerio Furlan Junior rof0007@auburn.edu
University of Tennessee, Knoxville, USA. https://orcid.org/0009-0000-0529-8246
Thomas Mueller tmueller@utk.edu
University of Tennessee, Knoxville, USA. https://orcid.org/0000-0001-9907-2853
Lawrence Steckel lsteckel@utk.edu
University of Tennessee, Knoxville, USA. https://orcid.org/0000-0002-4004-5102
Renata Oakes rnave@utk.edu
University of Tennessee, Knoxville, USA. https://orcid.org/0000-0002-6872-8079
Bruno Carneiro e Pedreira pedreira@utk.edu
University of Tennessee, Knoxville, USA. https://orcid.org/0000-0003-4663-954X

DOI:

https://doi.org/10.31413/

Palavras-chave:

weed control, hay, legume, herbicide, resistance

Resumo

Nutrição com boro e uso de herbicidas no manejo do Amaranthus palmeri resistente ao glifosato em alfafa RR

RESUMO: A alfafa (Medicago sativa L.) é uma das culturas forrageiras de maior valor econômico no mundo, devido ao seu elevado valor nutritivo e à adaptabilidade a diferentes condições edafoclimáticas. No entanto, seu potencial agronômico depende da fertilidade do solo e do controle eficiente de plantas daninhas. A produção de alfafa exige aportes substanciais de macronutrientes e de boro, o único micronutriente recomendado rotineiramente e, ainda assim, frequentemente negligenciado. A deficiência de boro é comum em solos de textura arenosa, com pH elevado e sob condições de seca, e reduz o vigor de rebrotação, a persistência do estande e a capacidade da cultura de competir com plantas daninhas. A adoção da alfafa Roundup Ready^® (resistente ao glifosato) inicialmente simplificou o controle de plantas daninhas; contudo, o uso repetido de glifosato em culturas resistentes selecionou biótipos resistentes, como o caruru-gigante resistente ao glifosato (Amaranthus palmeri S. Watson). Opções herbicidas alternativas, incluindo inibidores da protox e do paraquat, podem proporcionar controle eficaz da daninha, porém são limitadas pela seletividade à cultura, pelo momento de aplicação, pelas condições ambientais ou por restrições regulatórias. Esta revisão teve como objetivo consolidar as pesquisas existentes sobre fertilidade com boro, opções herbicidas e biologia do caruru-gigante, a fim de compreender como esses fatores se relacionam e orientar estratégias de manejo integrado para sistemas de produção de alfafa mais produtivos e sustentáveis.

Palavras-chave: caruru-gigante; feno; legume; herbicida; forragem.

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BORON NUTRITION AND HERBICIDE STRATEGIES IN MANAGING GLYPHOSATE-RESISTANT PALMER AMARANTH IN Roundup Ready^Ò ALFALFA

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