Resumen

ORTIZ, Aída  y  LOPEZ, Luis. Rice weed control. Agronomía Trop. [online]. 2011, vol.61, n.3-4, pp.199-214. ISSN 0002-192X.

The weedy/red rice (WR) causes great damage to rice agriculture chain. Due to the economic importance of this weed in Venezuela, with the objetive of evaluate the control of red rice, in the El Esfuerzo farm located at municipio Ospino, Portuguesa State, were selected two irrigated rice fields (plot 3 = 5.3 ha and plot 5 = 3.37 ha), highly infested with red rice. To conduct this research, two experiments were established: (1) Red rice control using three preplant herbicides: butachlor, oxadiargyl, they both were applied in sheet of water and glyphosate was applied in post emergen in dry, compared to conventional preparation soil, and (2) Red rice control using glyphosate, soil puddling and the Clearfield System (variety CF-205 + two imidazolinone herbicides: imazapyr + imazapic and imazapyr + imazethapyr). A design of large plots without replications with sampling within each plot (Machado, 2000) was used. The results revealed that the rice yields, in all preplanting treatments sowings for the control of WR: puddling, glyphosate, butachlor and oxadiargyl were 40.31, 30.72, 26.48 and 14.17%, higher than the control with WR, respectively. Similarly, the control of WR with these treatments exceeded 90%, when comparing the content of panicles of WR with those found in the control. Our results show that over 99% control of red rice in the treatments with 150.06 g.i.a.ha^-1 of imazapyr + imazapic and imazapyr + imazathepyr; 85.35% with two false sowings with glyphosate and 39.38% two false sowings with puddling. Imidazolinones treatments had 55, 22 and 31% higher yields than puddling and glyphosate, respectively.

Palabras clave : control; herbicides; Oryza sativa; soil smoothie/rice; weedy-red rice; red.

        · resumen en Español     · texto en Español     · Español ( pdf )