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Registro Completo |
Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
Data corrente: |
02/05/1994 |
Data da última atualização: |
02/05/1994 |
Autoria: |
HUNTER, J. H.; HSIAO, A. I; MCINTYRE, G. I. |
Título: |
Effect of nitrogen on the glyphosate-induced inhibition of rhizome bud growth in quackgrass (Elytrigia repens) |
Ano de publicação: |
1993 |
Fonte/Imprenta: |
Weed science v.41,p.426-433,1993. |
Páginas: |
p.426-433. |
Idioma: |
Inglês |
Conteúdo: |
In experiments conduced under controlled conditions, glyphosate-induced inhibition of rhizome bud growth in quackgrass was reduced by increasing the nitrogen (N) concentration in the nutrient solution from 10.5 to 210 mg L-1 either 2 or 4 before foliar application of the herbicide, and for 7 d after the herbicide treatment. The additional N reduced the glyphosate- induced inhibition of rhizome growth on the infact plant at the lowest glyphosate dosage (2.8 ug per plant) but had no significant effect at higher dosages. Both the 2- and 4-d high N treatments significantly increased the length, dry weight, and water content of the lateral buds by the time the herbicide was applied. They also increased bud growth on the glyphosate-treated plants during the 7d following the herbicide application and promoted release of the buds from inhibition during a subsequent bioassay of treir regenerative growth on excised, single-node rhizome segments. These effects of N supply interacted significantly with glyphosate dosage, bud position on the rhizome, and duration of incubation. It is postulated that bud growth response to incrased N supply may reduce the inhibiting effect of the herbicide by diluting the glyphosate concentration in the bud, or that the additional N may counteract the toxic action of glyphosate on amino acid metabolism or protein synthesis. Nomenclature: Gliphosate, N-(phosphonomethyl) glycine; quackgrass, Elitrigia repends (L.) Nevski #3 AGRRE. |
Palavras-Chave: |
Controle; Planta daninha. |
Thesagro: |
Crescimento. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02011naa a2200193 a 4500 001 1646441 005 1994-05-02 008 1993 bl --- 0-- u #d 100 1 $aHUNTER, J. H. 245 $aEffect of nitrogen on the glyphosate-induced inhibition of rhizome bud growth in quackgrass (Elytrigia repens) 260 $c1993 300 $ap.426-433. 520 $aIn experiments conduced under controlled conditions, glyphosate-induced inhibition of rhizome bud growth in quackgrass was reduced by increasing the nitrogen (N) concentration in the nutrient solution from 10.5 to 210 mg L-1 either 2 or 4 before foliar application of the herbicide, and for 7 d after the herbicide treatment. The additional N reduced the glyphosate- induced inhibition of rhizome growth on the infact plant at the lowest glyphosate dosage (2.8 ug per plant) but had no significant effect at higher dosages. Both the 2- and 4-d high N treatments significantly increased the length, dry weight, and water content of the lateral buds by the time the herbicide was applied. They also increased bud growth on the glyphosate-treated plants during the 7d following the herbicide application and promoted release of the buds from inhibition during a subsequent bioassay of treir regenerative growth on excised, single-node rhizome segments. These effects of N supply interacted significantly with glyphosate dosage, bud position on the rhizome, and duration of incubation. It is postulated that bud growth response to incrased N supply may reduce the inhibiting effect of the herbicide by diluting the glyphosate concentration in the bud, or that the additional N may counteract the toxic action of glyphosate on amino acid metabolism or protein synthesis. Nomenclature: Gliphosate, N-(phosphonomethyl) glycine; quackgrass, Elitrigia repends (L.) Nevski #3 AGRRE. 650 $aCrescimento 653 $aControle 653 $aPlanta daninha 700 1 $aHSIAO, A. I 700 1 $aMCINTYRE, G. I. 773 $tWeed science$gv.41,p.426-433,1993.
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Embrapa Mandioca e Fruticultura (CNPMF) |
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