Resumen

ESQUEDA-ESQUIVEL, Valentín Alberto; MONTERO-LAGUNES, Maribel  y  JUAREZ-LAGUNES, Francisco Indalecio. El control de arvenses en la productividad y calidad del pasto llanero. Agron. Mesoam [online]. 2010, vol.21, n.1, pp.145-157. ISSN 2215-3608.

Weed control in the productivity and quality of Gamba grass. From August 2003 to December 2004 a field test was carried out during two rainy seasons in the Municipality of Cotaxtla, Veracruz, Mexico, in order to determine the effect of different treatments to control weeds on the production and quality of Gamba grass. A completely randomized block design with four replications was used. The treatments were: 1. Picloram (4-amino-3,5,6-trichloro-2- pyridinecarboxylic acid) + fluroxypir (4-amino-3,5-dichloro- 6-fluoro-2-pyridyloxyacetic acid) (40 g + 40 g/100 l water), 2. Picloram + 2,4-D (2,4-dichlorophenoxyacetic acid) (64 g + 240 g/100 l water) 3. Mowing with machete, and 4. Weedy check. The treatments were applied once per rainy season in the same experimental plots. Weed population density was determined before treatment application, whereas weed control and forage production and quality were evaluated at 42, 98, 160 and 223 days after application (DAA) during the first rainy season and at 34, 72, 112 and 163 DAA during the second one. The two herbicide treatments resulted in a higher weed control than the mowing treatment, which was reflected in the last treatment in a reduction of the forage production 17,4 to 66,6% lower than the average obtained with the herbicide treatments. During the lowest moisture periods, the crude protein content of the Gamba grass was significantly higher at least in one of the herbicide treatments in relation with the weedy check.

Palabras clave : Grasslands; herbicides; mowing; crude protein; neutral detergent fiber.

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