It was aimed at in this work to evaluate the population dynamics of yellow nutsedge (Cyperus rotundus L.) and of other species of weeds at maize (Zea mays L.) crop also cultivated for grain and for silage, under no-tillage and conventional tillage of the soil conditions. In the first year, the maize was cultivated in total area, being half of the area in no-tillage and the other half in conventional tillage. Later each area was splitted in two plots: one […]

The experiment was installed on a transgenic soybean field (Glycine max (L.) Merrill), variety Soy 8888-RR, planted on January 11, 1999. One glyphosate application at 1.2 kg/L was performed before seeding, which was carried out seven days after that management practice, in the no-till system. The products were applied in the entire area of the plot, using a carbon dioxide (CO2) precision sprayer. Treatments consisted of: glyphosate at 0.48; 0.72; 0.96; 1.20 and 1.44 kg/ha, applied 31 days after emergence […]

Aiming to study the herbicides selectivity at pre-emergence: diclosulam (35,28 g a.i./ha), flumetsulan (120 g a.i./ha), flumioxazin (50 g a.i./ha), imazaquin (30 g a.i./ha), smetolachlor (1.920 g a.i./ha) and sulfentrazone (600 g a.i./ha) and post-emergence: flumioxazin (25 g a.i./ha), 2,4-D (840 g a.i./ha), 2,4-D (536 g a.i./ha), bentazon/acifluorfensodium (450 g a.i./ha), acifluorfen-sodium/bentazon (240 g a.i./ha), chlorimuron-ethy (l17,5 g a.i./ha), fomesafen (250 g a.i./ha), imazethapyr (100 g a.i./ha) and lactofen (168 g a.i./ha), in Stylosanthes capitata and S. macrocephala, field trails were […]

In order to study the isoxaflutole persistence in a clay soil cultivated with potato cv. Monalisa, a field experiment was carried out at Bayer CropScience Experimental Station, in Paulínia – SP. A complete split-plot randomized block design with four replication was used. In the main plots were studied the rates 0, 75, 150 and 300 g ai/ha in a pre-emergence application. On the day of treatment and at seven day intervals until 140 days after treatment, except at 119 days, […]

Bidens spp. especies are present in 74% of the farms of central plateaus of the state of Rio Grande Do Sul, Brazil. The species Bidens pilosa was the first weed to be documented as resistant to herbicides inhibitors of the enzyme acetholactate sinthase (ALS), in Brazil. Foransulfuron + iodosulfuron and imazapic + imazapyr are ALS inhibitors recently launched to use on the corn crop. Since, there is no record of the action of these herbicidas on resistant Bidens spp. biotypes, […]

The yellow passion fruit is one of the most interesting economic species of Passifloraceae family. The biotechnology tools are useful to solve some problems that affect the productive potencial of this specie, like fungal and bacterial diseases, and the creation of more productivity varieties. In this context an experiment of yellow passion fruit was corried out to evaluate the glyphosate and gluphosinato herbicides as selective agents for genetic transformation. The culture medium used was Murashige & Skoog (1962) supplemented with […]

The work was carried out to evaluate the herbicide flumioxazin performance compared to commercial patterns applied in pre-emergency in the transplanted onion culture. Field trials were carried out in Monte Alto, SP, arranged in a randomized complete block design with four repetitions. The used herbicides were: flumioxazin (0,080; 0,120; 0,180; 0,240 kg ha-1), oxadiazon + linuron (0,500 + 0,900 kg ha-1), linuron (1,350 kg ha-1) and oxadiazon (0,75 kg ha-1). Two controls also were maintained, one with and other without […]

An experiment was carried-out with the objective of evaluating the selectivity and efficacy of herbicides applied for weed control on winter cereals. The experiment was conducted under field conditions at the field station of Embrapa, in Passo Fundo, RS, during the 2005 growing season. The soil of the station is a loam Oxisol. The evaluated crops were wheat, barley, rye and triticale. Black oats, oats, turnipseed and vetch were sown in order to act as volunteer crops interfering with those […]

The environmental fate of a pesticide depends on many factors, among them the soil characteristics as mineralogy, soil chemistry and organic matter content. This study aims to verify how the adaptation of chemical and mineralogical properties of a dark red latosol from the Brazilian savanna under the continuous use of no till practice can affect its affinity to atrazine and two metabolites (deethylatrazine and hydroxyatrazine). Therefore, beyond the characterization of the cited parameters, batch studies were performed with both no […]

Studies on herbicides selectivity in the culture sugar-cane, they plows generally done together with rehearsals of effectiveness on harmful plants and always being used the witness by experimental block. When the contrast treatment is analyzed with herbicide in relation to an only witness without herbicide, there is a tendency in obtaining larger values for the variation coefficient, being able to not in that way, to hide some non selective herbicides. Therefore, the objective of the present work, specifically went evaluate […]