The aim of this study was to evaluate the initial growth of cassava plants after post-emergence application of herbicides. The experiment was carried out in greenhouse, with randomized block design and four replications. Treatments consisted in the application of herbicides 25 days after crop emergence. The herbicides applied were bentazon, clomazone, fomesafen, fluazifop-p-buthyl, glyphosate, nicosulfuron, chlorimuron-ehtyl, sulfentrazone and the fluazifop-p-buthyl + fomesafen, and a treatment without herbicide application. The visual intoxication of cassava plants was evaluated at 7, 14, 21 […]

Ryegrass is the main weed that infests barley, causing high yield losses and quality of grain. Thus, this work intended to evaluate the selectivity and efficacy of herbicides for weed control in barley. For such, we carried out an experiment in the field with randomized block design in factorial scheme 2 x 12, with four replications. Factor A is composed by the barley genotypes MN610 and Criola and factor B by herbicides: iodosulfuron imazethapyr + imazapic; clomazone; propanil; oxyfluorfen; metsulfuron-methyl; […]

The selectivity of pre-emergence herbicides depend of the soil characteristics. In this context, the aim of this works was evaluated the fomesafen selectivity to cotton crop in soil with contrasting textural class. The experiment was performed under greenhouse conditions in completely randomized design, with five replications. The treatments were organized in factorial arrangement 5 x 2, with the first level representing five doses of fomesafen (0, 175, 350, 525 e 700 g ha-1) and the second factor two soils with […]

This work aimed to evaluate the selectivity of herbicides applied pre-emergence, isolated or in tank-mixtures, for two cotton varieties, Delta-Opal and FMT-701. Treatments applied were: alachlor, S-metolachlor, diuron (two rates), prometryn (two rates), oxyfluorfen, alachlor + diuron, alachlor + prometryn (two rates of this mixture), S-metolachlor + diuron, S-metolachlor + prometryn (two rates of this mixture), oxyfluorfen + diuron, oxyfluorfen + prometryn. Evaluations performed were related to the visual plant intoxication, height of plants and crop yield. When rates of […]

The objective was to evaluate the effect of glyphosate, paraquat and glufosinate-ammonium applied as directed spray in initial development of jatropha plants. A randomized block design was used, with five replicates. The treatments consisted of glyphosate (180, 360, 720 and 1,440 g ha-1), paraquat (100, 200, 400 and 800 g ha-1) and glufosinate-ammonium (125, 250, 500 and 1,000 g ha-1) and a control (no application). Herbicide application was performed at 145 days after sowing, with spraying directed to the lower […]

Cassava varieties (Manihot esculenta L. Crantz) intended for industrial starch manufacturers are usually pruned during the period of physiological rest of the plants, requiring the adoption of management practices to prevent weed competition in the second cycle of crop development. The objective was to evaluate the selectivity of pre-emergent herbicides applied alone or in tank mix with glyphosate in applications after pruning of cassava ‘Fécula Branca’. The experimental design was a randomized block with four replications. The treatments were: glyphosate […]

The most used method in weed control is chemical, though, the sunflower is very sensitive, especially the post-emergent herbicides that control dicotyledonous weed species. Thus, the aim of this work was to evaluate the tolerance of sunflower to different herbicides as well as to evaluate the effect of these products on physiological characteristics of sunflower plants. For this, we assembled an experiment conducted in a greenhouse. We used a completely randomized design with five replications. The treatments consisted of 10 […]

The use of adjuvant can influence the selectivity of herbicides on crops. Aimed to evaluate the selectivity of herbicides with different concentrations of mineral oil adjuvant in cassava ‘Cascuda’. The experimental design was a randomized block design with four replications. We used a factorial design 3×3+1 which consisted of three herbicides clethodim (120 g ha-1), fluazifop-p-butyl (250 g ha-1) and mesotrione (240 g ha-1), three concentrations of mineral oil (Assist®) 0.0, 0.5 and 1.0% v v-1, and a control without […]

The most used weed control method in the sugarcane crop nowadays is the chemical. However, there is a great variation in selectivity of the genotypes regarding these products. The aim of this work was to evaluate the effect of herbicides on yield components of sugarcane genotypes. It was used a randomized blocks design, in a split-splot, with four replicates. In the plots were allocated the treatments: ametryn (2000 g ha-1), trifloxysulfuron-sodium (22.5 g ha-1), ametryn + trifloxysulfuron-sodium (1,463 + 37 […]

Generation of RR® soybean genotypes allowed many farmers adopted the use of glyphosate in weed management in post-emergence in cerrado. However, information about the use of this technology on soybean crop growth in “cerrado” region is important in order to obtain desired yields. Thus, the objective of this study was to evaluate the effects of glyphosate application in post-emergence condition over agronomic characteristics and over RR soybean nodulation. The trial was conducted in randomized blocks experimental design in factorial scheme […]