The objective of this study was to evaluate the effects of application of glyphosate and paraquat compared to mowing to control invasive grasses in degraded areas. For the present study, the area was divided into two areas with different values of penetration resistance of soil and the fresh weight of the shoots. In each environment were selected five plots of 6×6 m². Each plot was divided into four subplots receiving treatments: glyphosate (1,44 kg ha-1), paraquat (0,40 kg ha-1), mowing […]

The objective of this study was to evaluate the efficacy in herbicides control applied in Crotalaria spectabilis and Crotalaria ochroleuca adult plants. Three experiments were installed with seven herbicides arranged in a randomized block design with four repetitions. It was realized visual evaluations of control at 3, 7, 14, 21, 35 and 42 after applications (DAA), and regrowth at 21, 28, 35 and 42 (DAA). It was concluded that treatment with sequential application of glyphosate(1,550 + 1,860 g ha-1) provided […]

The accompaniment of cultivated areas with cotton Liberty Link genotype (LL®) in Brazilian Cerrado-like vegetation has conducted to the observation that amonio-glufosinate isolated does not have proportionate the adequate weeds control commonly found in these areas, becoming clear the necessity of several control interventions until crop closing. The objective of this work was to verify the benefits in associating pyrithiobac-sodium to applications carried with amonio-glufosinate in cotton Liberty Link genotype (LL®) for controlling and reducing weeds new infestation. The experiment […]

Experiments were conducted in Prudente de Morais County, Minas Gerais State, in 2010 and 2011 years, with the objective of to evaluate selectivity and efficiency of pre and post-emergence herbicides in sunflower crop, as well as to study weeds populacional dynamic. The work conducted in 2010 was carried out in greenhouse, in a randomized complete block design, with 11 treatments and three replications. Treatments consisted by ten herbicides, four in pre emergence and six in post-emergent of the crop (alachlor, […]

Weed interference can cause severe damages to common bean grain yield. Although the use of herbicides is considered as an efficient means to control weeds, there are just a few alternatives to use in pre-emergence applications. The objective of this work was to evaluate the potential use of pre-emergence applications of clomazone for five cultivars of common bean. Experiments were carried out under greenhouse conditions in a completely randomized design, and the treatments were increasing rates of clomazone (0, 300, […]

Herbicides alternatives for controlling sourgrass (Digitaria insularis) weed in infested citrus areas are limited, mainly due to the few options of registered herbicides and by the modalities in that these chemical products are used (directed applications). Thus it is important to evaluate other post-emergence herbicides, to be used in association with glyphosate, for the efficient control of glyphosate-resistant biotype of sourgrass (Digitaria insularis), resistant to glyphosate.  The experiment was conducted in Matão County, Sao Paulo State, in area belonging to […]

It was evaluated the effect of glyphosate reduced rates on growth and phosphorus (P) uptake of ‘Xodó’ common bean (Phaseolus vulgaris L.) genotype. The experiment was conducted in factorial scheme 4 x 2, in randomized blocks design with four replications, with the first factor constituted by reduced doses of 0, 4.32, 8.64 and 12.96 g ha-1 equivalent acid (e.a.) of glyphosate and the second factor consisted of soil P rates (50 and 250 mg dm-3). Evaluations were conducted 30 days […]

The objective of this work was to select appropriate bioindicators for monitoring the mobility in soil and persistence of amicarbazone, ametryne, diuron and clomazone herbicides. The experiments were conducted in greenhouse conditions, in polyethylene pots of 250 cm3 with dystroferric Red Latosol. In each experiment, it was used one herbicide (amicarbazone, ametryn, diuron or clomazone) and three bioindicators (10 seeds of each specie), distributed in randomized blocks design in a factorial scheme 5 x 3, with three replications. Studied factors […]

The objective of this research was to evaluate contrasting textures soils (clay and loamy sand) in the leaching of diuron + hexazinone + sulfometuron-methyl (1386.9 + 391 + 33.35 g ha-1) commercial formulation, and also hexazinone (391 g ha-1), diuron (1386.9 g ha-1) and sulfometuron-methyl (33.35 g ha-1), in soil columns mounted in PVC pipes. One day after the herbicide application, half of the columns received 40 mm of simulated rainfall and Ipomoea triloba weed was sown. At 21 and […]

Sourgrass (Digitaria insularis) is a perennial weed which has the ability to germinate, grow and develop during the entire year under Brazilian weather conditions. Once established with the formation of rhizomes, the difficulty of control greatly increases. With the recent confirmation of the existence of resistant biotypes to glyphosate, the problems became worse and knowledge on the biology of this species is critical to develop strategies for chemical management of sourgrass. The presence of this species should be monitored during […]

This study, during one year period, dealt with the identification of the floristic composition of weeds in areas of sugarcane production, in Felixlândia, Minas Gerais State (Brazil), in response to predecessor crops to sugarcane planting. The experiment was carried out at the EPAMIG Experimental Farm, in a randomized complete block design with six treatments and four replications, being evaluated the sugarcane variety SP81-3250. The treatments were the predecessor crops to sugarcane: Pennisetum glaucum, Crotalaria juncea, Stizolobium aterrimum, Cajanus cajan and […]