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CORREIA, Núbia Maria; DURIGAN, Julio Cezar  and  KLINK, Urubatan Palhares. Influence of the type and amount of crop residues in efficiency of herbicides applied pre-emergence in soybean. Bragantia [online]. 2007, vol.66, n.1, pp.111-120. ISSN 0006-8705.

This work was conducted in the agricultural years 2003/04 and 2004/05, at the farm 'Três Marcos', Uberlândia, MG - Brazil to evaluate the effect of crop residues [coverage sorghum (hybrid Cober Exp), forage millet (var. BN2), finger millet (Eleusine coracana) and St. Lucia Grass (Brachiaria brizantha)] and two amounts of straw (3.0 and 5.5 t ha-1 in the first year and 3.5 and 5.8 t ha-1, in the second year) in efficiency of herbicides (diclosulam and uimazaquin) applied pre-emergence in soybean, 'Cerrado' conditions. The efficiency of herbicides diclosulam and imazaquin was not affected by the straw at any amount. Associated to the straw coverage, it had best weed control. In the first year, after the soybean field was installed, Eleusine coracana became the major weed species in the finger millet plot.

Keywords : cerrado; mulch; chemical control; integrated management; weed; no-tillage system.

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