PENERAPAN METODE PEMBELAJARAN RESITASIDALAM MENINGKATKAN HASIL BELAJAR SISWA PADA MATA PELAJARAN SEJARAH KEBUDAYAAN ISLAM KELAS VII DI MADRASAH TSANAWIYAH NEGERI 8 BUNGO

Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar siswadengan menggunakan metode Resitasi dalam pembelajaran Sejarah Kebudayaan Islam Kelas VII di Madrasah Tsanawiah Negeri 8 Bungo.Desain penelitian yang digunakan dalam penelitian ini adalah Penelitian Tindakan Kelas (PTK) dengan Subjek Penelitian Siswa Kelas VII Madrasah Tsanawiyah Negeri 8 Bungo.Penelitian ini dilakukan sebanyak 2 siklus dengan masing-masing siklus terdiri dari 2 kali pertemuan. Adapun teknik pengumpulan data yang digunakan adalah tes, observasi, wawancara dan dokumentasi dengan teknik analisis data kualitatif dan kuantitatif.Hasil penelitian menunjukkan bahwa hasil observasi aktifitas belajar siswa yang dilakukan pada silus I mencapai 47,5% dan pada siklus II lebih meningkat menjadi 90%. dan sejalan dengan hasil belajar siswa pada siklus I 52% dan siklus II lebih meningkat menjadi 88% dengan kategori baik. Peningkatan yang terjadi menunjukkan adanya ketercapaian indikator keberhasilan

Misturas de flumioxazin com glyphosate e sulfosate para o manejo de plantas daninhas em citros

To evaluate the efficacy of flumioxazin mixtures with glyphosate and sulfosate used in handling postemergence in citros, an experiment was conducted in Presidente Castelo Branco, PR, in a 3 year old orange orchard, "Pear" variety. The experimental design was randomized blocks with seventeen treatments and four replicates. The evaluated treatments were: flumioxazin (10, 15,20 and 25 g/ha), flumioxazin + glyphosate (l0+960, 15+960, 20+960, 20+ 1920 and 25+960 glha), flurnioxazin + sulfosate (10+960, 15+960, 20+960, 20+ 1920 and 25+960 g/ha), glyphosate (960 g/ha), sulfosate (960 glha) and check without weed control. The products were sprayed under the crop plants. The weeds present in the area were: Sida rhombifolia (up to 60 em high), Bidens pilosa (up to 50 em high), Richardia brasiliensis (flowering), Digitaria horizontalis (up to 3 tillers) and Brachiaria decumbens (up to 20 tillers). The flumioxazin mixtures with glyphosate and sulfosate, starting from rate of 10+960 g/ha, were efficient in the control of the weeds. The glyphosate and sulfosate alone were efficient in the control of the present species, no significant differences being observed between mixtures starting from 7 days after application (7 DAA). The flumioxazin alone did not provi de adequate control ofthe weeds, but when in mixture with glyphosate and sulfosate presented faster control effect, observed at 3 DAA. For B. decumbens, glyphosate or sulfosate up to 1920 g/ha in mixture with flumioxazin at 20 g/ha provided longer weed control, with few tillers. No chemical treatment visable injured the orange crop. Visando avaliar a eficácia de misturas de flumioxazin com glyphosate e sulfosate utilizadas em pós-emergência dirigida em citros, foi conduzido um experimento em Presidente Castelo Branco, PR, em pomar de laranja variedade "Pera" com 3 anos de idade. O delineamento experimental utilizado foi o de blocos ao acaso, com dezessete tratamentos e quatro repetições. Os tratamentos avaliados foram: flumioxazin (10, 15,20 e 25 g/ha), flumioxazin + glyphosate (10+960, 15+960,20+960,20+1920 e 25+960 glha), flumioxazin + sulfosate (10+960, 15+960,20+960,20+ 1920 e 25+960 glha), glyphosate (960 g/ha), sulfosate (960 gj ha) e testemunha sem capina. As aplicações foram desenvolvidas em faixas de 8 m ao lado da linha de plantio. As espécies presentes na área foram: Sida rhombifolia (até 60 em de altura), Bidens pilosa (até 50 em de altura), Richardia brasiliensis (florescimento), Digitaria horizontalis (até 3 perfilhos) e Brachiaria decumbens (até 20 perfi lhos ). As misturas de flumioxazin com glyphosate e sulfosate, a partir das doses de 10+960 g/ha, foram eficazes no controle das plantas daninhas. Glyphosate e sulfosate isolados foram eficazes no controle das espécies presentes, não diferindo das misturas a partir dos 7 dias após aplicação (DAA). O flumioxazin isolado não proporcionou controle das plantas daninhas, mas quando em mistura com glyphosate ou sulfosate produziu efeito mais rápido de controle, observado aos 3 DAA. Para B. decumbens, glyphosate ou sulfosate a 1920 g/ha em mistura com flumioxazin a 20 g/ha proporcionaram controle mais prolongado, com poucos rebrotes. Nenhum tratamento químico causou danos visuais à cultura da laranja.

Sorption and desorption of indaziflam degradates in several agricultural soils

Processes regulating pesticide fate in the environment are influenced by the physicochemical properties of pesticides and soils. Sorption and desorption are important processes as they regulate the movement of pesticides in soil. Although sorption-desorption is widely studied for herbicides, studies involving their metabolites in soil are scarce. Sorption and desorption of indaziflam metabolites (indaziflam-triazinediamine (FDAT), indaziflam-triazine-indanone (ITI) and indaziflam-carboxilic acid (ICA)) were investigated in six Brazilian (BRA) soils and three United States (USA) soils with different physicochemical properties. The Freundlich equation described sorption of the metabolites for all soils (R2 >; 0.98; 1/n ~ 1). Sorption order (Kf) was ITI >; ICA >; FDAT. Mean values of Kf,oc were 453, 289, and 81 (BRA) and 444, 48, and 48 (USA) for metabolites ITI, ICA, and FDAT respectively. Desorption was hysteretic for all metabolites in all soils. These results suggest that these metabolites fall in the classification range of mobile to moderately mobile in soils

Seletividade de herbicidas sobre as características de produção da cana-de-açúcar utilizando-se duas testemunhas

In Brazil studies of herbicides selectivity on the production parameters in sugar cane are generally carried out together with rehearsals of agronomic effectiveness in weeds and always using a checkplot per experimental replicate. When the contrast is analyzed considenry herbicide in relation to only one check without herbicide, there is a tendency in obtaining larger values for the variation coefficient, what could hide some effects of herbicides not selectives. Therefore, the objective of the present work, was specifically evaluate herbicide selectivity on sugarcane yield parameters: diameter, length, number of among knot and production of sugarcane stems, maintaining the portions constantly weeded, and using two lateral checks without herbicide adjacent to each treatment with herbicide. The results showed that in post-emergence, 2,4-D + hexazinone/ diuron (1.34 + 0.27/ 0.94 kg i.a./ there is) affected the diameter and the length of stems signifratinely, reducing the production in 16,6 t/ha. Tebuthiuron (0.96 kg i.a./ha) it affected the diameter, tebuthiuron + diuron (0.96 + 1.25 kg i.a./ha) and diuron + ametryn (1.25 kg i.a.l/ha) affected the number of among knot, reducing the stem production in 11.9; 17.0; 5.5 t/ha respectively. Ametryn (2.25 kg i.a./ha) and oxyfluorfen (0.72 kg i.a./ha) applied in pre-emergence they were not considered selective for the parameter number of among knot, however they didn't cause reduction in the stems production.No Brasil estudos de seletividade de herbicidas sobre os parâmetros de produção em cana-de-açúcar, são feitos geralmente juntos com ensaios de eficácia agronômica em plantas daninhas e sempre utilizando uma testemunha por bloco experimental. Quando se analisa o contraste tratamento com herbicida em relação a uma única testemunha sem herbicida, há tendência em se obter maiores valores para o coeficiente de variação, podendo ocultar alguns herbicidas considerados não seletivos. Logo, o objetivo do presente trabalho, foi avaliar especificamente a seletividade de herbicidas sobre os parâmetros diâmetro, comprimento, número de entrenós e produção de colmos de cana-de-açúcar, mantendo as parcelas constantemente capinadas, e utilizando-se duas testemunhas laterais adjacentes a cada tratamento com herbicida. Os resultados mostraram que em pós-emergência, 2,4-D + hexazinone/ diuron (1,34 + 0,27/ 0,94 kg i.a./ha) afetaram significativamente o diâmetro e o comprimento de colmos, reduzindo a produção em 16,6 t/ha. Tebuthiuron (0,96 kg i.a./ha) afetou o diâmetro, tebuthiuron + diuron (0,96 + 1,25 kg i.a./ha) e diuron + ametryn (1,25 kg i.a./ha) afetaram o no de entrenós, reduzindo a produção de colmos em 11,9; 17,0; 5,5 t/há respectivamente. Ametryn (2,25 kg i.a./ha) e oxyfluorfen (0,72 kg i.a./ha) aplicados em préemergência foram considerados não seletivos para o parâmetro número de entrenós, entretanto não causaram redução na produção de colmos

Metodologia para estudo de seletividade de herbicidas na cultura da cana-de-açúcar (Saccharum spp).

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 to herbicides selectivity about the production of stems of the sugar-cane, constantly staying the portions weeded, and being used two lateral witness adjacent to each treatment with herbicide. With that methodology, the results showed that the herbicides 2,4-D + ametryn (1,34 +1,50 l i.a./ ha), tebuthiuron + diuron (0,96 + 1,25 l i.a/ ha), 2,4-D + hexazinone + diuron (1,34 + 0,27 + 0,94 l i.a./ ha), ametryn (1,50 l i.a./ ha), tebuthiuron (0,96 l i.a./ ha) and tebuthiuron + ametryn (0,96 + 1,50 l i.a/ ha) they reduced the stems production significantly in 19,5; 17,0; 16,6; 15,1; 11,9 and 10,9 t ha-1 respectively, with levels of smaller significance than 3%. Therefore, such products were not considered selective the cv. RB 835089 when applied in the powder-emergency of the culture.    Estudos sobre seletividade de herbicidas na cultura cana-de-açúcar, são feitos geralmente juntos com ensaios de eficácia sobre plantas daninhas e sempre utilizando-se uma testemunha por bloco experimental. Quando se analisa o contraste tratamento com herbicida em relação a uma única testemunha sem herbicida, há uma tendência em se obter maior valores para o coeficiente de variação, podendo dessa forma, ocultar os efeitos de alguns produtos não seletivos. O objetivo do presente trabalho, foi avaliar especificamente a seletividade de herbicidas sobre a produção de colmos da cana-de-açúcar, mantendo-se as parcelas constantemente capinadas, e utilizando-se duas testemunhas laterais adjacentes a cada tratamento com herbicida. Com essa metodologia, os resultados mostraram que os herbicidas 2,4-D + ametryn (1,34 +1,50 l i.a./ ha), tebuthiuron + diuron (0,96 + 1,25 l i.a/ ha), 2,4-D + hexazinone + diuron (1,34 + 0,27 + 0,94 l i.a./ ha), ametryn (1,50 l i.a./ ha), tebuthiuron (0,96 l i.a./ ha) e tebuthiuron + ametryn (0,96 + 1,50 l i.a/ ha) reduziram significativamente a produção de colmos em 19,5; 17,0; 16,6; 15,1; 11,9 e 10,9 t/ há respectivamente, com níveis de significância menor que 3%. Logo, tais produtos foram considerados não seletivos a cv. RB 835089 quando aplicados na pós-emergência da cultura

Carryover de herbicidas utilizados no controle de soqueiras do algodoeiro sobre o milho cultivado em sucessão

Information about the residual activity of herbicides sprayed in the control of cotton stalks and its potential to affect the development and productivity of corn sown in the following crop are limited. The objective of this work was to identify the carryover effect promoted by the single and sequential application of herbicides used in the control of cotton stalks and to estimate the plant-back for corn sowing. Two trials were carried out simultaneously in a greenhouse, one for a single application and one for a sequential application of herbicides treatments. It was used a 15 x 5 factorial scheme, in a randomized block design with four replicates. The first factor was composed of herbicide treatments and the second factor of five sowing seasons after the application (0, 30, 60, 90 and 120 days). The experimental plots were composed of plastic pots with a capacity of 3 dm3 filled with loamy soil (470 g kg-1 clay), dried and sieved. The herbicides sprayed were 2,4-D, glyphosate, saflufenacil, [imazapic + imazapyr], dicamba, fluroxypyr, and sulfentrazone. The sequential application of most treatments provided an increase in the residual activity of the evaluated herbicides. The 2,4-D (1,340 g ha-1), 2,4-D + glyphosate (1,340 + 720 g ha-1) and 2,4-D + glyphosate + saflufenacil (1,340 + 720 + 105 g ha-1) presented the shortest safety intervals and were those that presented the lowest risk of affecting the corn sown in succession, even in sequential applications. However, the treatments that consisted of association with herbicides with higher residual activity in the soil such as dicamba, fluroxypyr, sulfentrazone and [imazapic + imazapyr], presented higher carryover potential for corn crop, being observed a safety interval greater than 94 days after sequential application of 2,4-D + glyphosate + sulfentrazone.São limitadas as informações sobre a atividade residual de herbicidas aplicados no controle das soqueiras do algodoeiro e o seu potencial para afetar o desenvolvimento e a produtividade do milho semeado na safra seguinte. O objetivo desse trabalho foi identificar o efeito carryover promovido pela aplicação única e sequencial de herbicidas utilizados no controle das soqueiras do algodoeiro e estimar o intervalo de segurança entre o manejo químico da soqueira do algodoeiro e a semeadura do milho. Foram conduzidos simultaneamente dois experimentos em casa de vegetação, um para aplicação única e outro para aplicação sequencial dos tratamentos herbicidas. Os experimentos foram instalados em esquema fatorial 15 x 5, delineados em blocos casualizados com quatro repetições. O primeiro fator foi composto por tratamentos herbicidas e o segundo fator por cinco épocas de semeadura do milho após a aplicação (0, 30, 60, 90 e 120 dias). As parcelas experimentais foram compostas de vasos plásticos com capacidade para 3 dm3 preenchidos com solo de textura argilosa (470 g kg-1 de argila), seco e peneirado. Os herbicidas utilizados foram 2,4-D, glyphosate, saflufenacil, [imazapic+imazapyr], dicamba, fluroxypyr e sulfentrazone. Conclui-se que a aplicação sequencial da maioria dos tratamentos proporcionou um aumento na atividade residual dos herbicidas avaliados. Os tratamentos 2,4-D (1340 g ha-1), 2,4-D + glyphosate (1340 + 720 g ha-1) e 2,4-D + glyphosate + saflufenacil (1340 + 720 + 105 g ha-1) apresentaram os menores intervalos de segurança e foram aqueles que apresentaram o menor risco de afetar o milho semeado em sucessão, mesmo em aplicações sequenciais. Contudo, os tratamentos constituídos pela associação com herbicidas de maior atividade residual no solo como o dicamba, fluroxypyr, sulfentrazone e [imazapic+imazapyr], apresentaram maior potencial de carryover para a cultura do milho, sendo observado intervalo de segurança superior a 94 dias após a aplicação sequencial de 2,4-D + glyphosate + sulfentrazone

Dry season and soil texture affect the chemical control of monocotyledonous in sugarcane

The chemical weed control in sugarcane during the wet season is more effective than the control carried out during the dry season. The objective of this study was to evaluate the efficacy of herbicides in the rainy season and in the dry season in sugarcane crop, and in different soil textural classes. The experiments simulated dry season and rainy season basing on periods of days in which experiment was submitted to irrigation restriction. In each experiment, it was tested 50 and 100% of the dose of the main herbicides commonly used in sugarcane to control B. decumbens, B. plantaginea, P. maximum and D. horizontalis. In general, in dry conditions, as well as varying the soil texture, there are restrictions in the choice of herbicide to be used due to the reduced effectiveness of some treatments in certain situations. In the very-clayey soil, especially in the dry season, the efficacy of herbicides is better, whereas, for the sandy-clay-loam soil in dry conditions, the effectiveness of herbicides is restricted. Thus, this study, despite the great complexity of the variables to be analyzed, permitted to establish guidelines for decision making on the most appropriate herbicide to be applied in each studied condition, in order to control these weed species.The chemical weed control in sugarcane during the wet season is more effective than the control carried out during the dry season. The objective of this study was to evaluate the efficacy of herbicides in the rainy season and in the dry season in sugarcane crop, and in different soil textural classes. The experiments simulated dry season and rainy season basing on periods of days in which experiment was submitted to irrigation restriction. In each experiment, it was tested 50 and 100% of the dose of the main herbicides commonly used in sugarcane to control B. decumbens, B. plantaginea, P. maximum and D. horizontalis. In general, in dry conditions, as well as varying the soil texture, there are restrictions in the choice of herbicide to be used due to the reduced effectiveness of some treatments in certain situations. In the very-clayey soil, especially in the dry season, the efficacy of herbicides is better, whereas, for the sandy-clay-loam soil in dry conditions, the effectiveness of herbicides is restricted. Thus, this study, despite the great complexity of the variables to be analyzed, permitted to establish guidelines for decision making on the most appropriate herbicide to be applied in each studied condition, in order to control these weed species

Evaluation of tank mixtures of imazethapyr with other herbicides for Bidens pilosa and Euphorbia heterophylla control in soybean

Esse estudo teve por objetivo avaliar a seletividade para soja e eficiência de misturas em tanque de imazethapyr com outros latifolicidas. Os tratamentos avaliados foram imazethapyr (100 g/ha), imazethapyr + chlorimuron-ethyl (50+ 1O, 50+ 12,5 e 60+ 10 g/ha), jmazethapyr + lactofen (50+96, 50+120, 60+96, 60+120 e 12,5+120 g/ha), imazethapyr + oxasulfuron (50+37,5 e 60+37,5 g/ha), além de chlorimuron-ethyl + lactofen (12,5+120 g/ha), oxasulfuron (45 g/ha), chlorimuron-ethyl (15 g/ha), lactofen (168 glha), e testemunhas capinada e sem capina. Todos os herbicidas foram aplicados em pós-emergência, quando a soja encontrava-se no estádio V4 a V5 (3 a 4 folhas trifolioladas). As plantas daninhas presentes, densidades e estádios de desenvolvimento na área experimental eram Bidens pilosa (179 plantas/m', 2 a 4 folhas) e Euphorbia heterophylla (63 plantas/m-, 4 a 5 folhas). As misturas de imazethapyr com chlorimuron-ethyl, lactofen e oxasulfuron foram excelentes no controle de ambas espécies, não evidenciando diferenças significativas entre as diferentes misturas ou entre doses de uma mesma mistura. Em relação á E. heterophylla, as misturas contendo imazethapyr foram superiores a chlorimuron-ethyl +1 actofen, e ás aplicações isoladas de chlorimuron-ethyl e lactofen. As misturas com imazethapyr apresentaram um efeito residual até 21 dias após a aplicação para E. heterophylla. Nenhum tratamento com herbicidas afetou o desenvolvimento ou -produtividade da soja.This study was intended to evaluate the selectivity to soybean and efficiency to control Bidens pilosa and Euphorbia heterophylla of tank mixtures of imazethapyr and other broadleaf herbicides. Treatrnents included imazethapyr (100 g/ha), imazethapyr + chlorimuron-ethyl (50+ 10,50+ 12.5 and 60+ 10 g/ha), imazethapyr + lactofen (50+96,50+ 120,60+96,60+ 120 and 12.5+120 g/ha), imazethapyr+oxasulfuron (50+37.5 and 60+37.5 g/ha), chlorimuron-ethyl + lactofen (12.5+120 g/ha), oxasulfuron (45 g/ha), chlorimuron-ethyl (15 g/ha), lactofen (168 g/ha), and weedy and weed free checks. All combinations ofherbicides were applied postemergence, at V4-V5 soybean growth stage (3 to 4 composite leaves). Weeds, development stage and population density in experimental area were: Bidens pilosa (2 to 4 leaves and 179 plants/m") and Euphorbia heterophylla (4 to 5 leaves and 63 plants/m-). Tank mixtures of imazethapyr with chlorimuron-ethyl, lactofen and oxasulfuron were bighly eificient for both weeds, providing >97% control at pre-harvest evaluation, with no significant diferences among different mixtures or among different rates within each mixture. ln relation to E. heterophylla, mixtures containing imazethapyr were more eff1cient than both chlorimuron-ethyl+lactofen, and isolated use of chlorimuron-ethyl or lactofen. Mixtures containing imazethapyr provided a residual effect up to 21 days afier application for E. heterophylla. No chemical treatrnent affected soybean development or productivity.

Selectivity of pre-and post-emergence herbicides to very-early maturing soybean cultivars

The combination of pre- and post-emergence herbicides may affect their selectivity to soybean plants, especially to short-cycle cultivars. The objective of this work was to evaluate the selectivity of pre- and post-emergence herbicides to very-early maturing soybean cultivars. Two field experiments were conducted, one in Mandaguaçu, Paraná (E1) and other in Rio Verde, Goiás (E2), Brazil, using a 4×7 factorial arrangement. The treatments consisted of four pre-emergence herbicide managements (S-metolachlor at 1440 g ha-1, diclosulam at 25.2 g ha-1, sulfentrazone at 300 g ha-1, and no herbicide application); and seven post-emergence herbicide managements (lactofen at 120 g ha-1, chlorimuron-ethyl at 12.5 g ha-1, bentazon at 720 g ha-1, lactofen at 120 g ha-1 + chlorimuron-ethyl at 12.5 g ha-1, glyphosate at 900 g a. e. ha-1, two sequential glyphosate applications at 720 g a. e. ha-1 each, and no herbicide application). The early-maturing soybean cultivars evaluated showed sensitivity to the herbicides used. The combined use of pre- and post-emergence herbicides increased the occurrence of injuries in the plants. Diclosulam and sulfentrazone were the least selective pre-emergence herbicides. All herbicide combinations used affected soybean grain yield in E1; lactofen, chlorimuron, and bentazon presented the least selectivity in E2.The combination of pre- and post-emergence herbicides may affect their selectivity to soybean plants, especially to short-cycle cultivars. The objective of this work was to evaluate the selectivity of pre- and post-emergence herbicides to very-early maturing soybean cultivars. Two field experiments were conducted, one in Mandaguaçu, Paraná (E1) and other in Rio Verde, Goiás (E2), Brazil, using a 4×7 factorial arrangement. The treatments consisted of four pre-emergence herbicide managements (S-metolachlor at 1440 g ha-1, diclosulam at 25.2 g ha-1, sulfentrazone at 300 g ha-1, and no herbicide application); and seven post-emergence herbicide managements (lactofen at 120 g ha-1, chlorimuron-ethyl at 12.5 g ha-1, bentazon at 720 g ha-1, lactofen at 120 g ha-1 + chlorimuron-ethyl at 12.5 g ha-1, glyphosate at 900 g a. e. ha-1, two sequential glyphosate applications at 720 g a. e. ha-1 each, and no herbicide application). The early-maturing soybean cultivars evaluated showed sensitivity to the herbicides used. The combined use of pre- and post-emergence herbicides increased the occurrence of injuries in the plants. Diclosulam and sulfentrazone were the least selective pre-emergence herbicides. All herbicide combinations used affected soybean grain yield in E1; lactofen, chlorimuron, and bentazon presented the least selectivity in E2

Controle de plantas daninhas na cultura do girassol com aclonifen aplicado isolado ou em mistura

The aim of this work was to evaluate the selectivity and the efficacy of ac1onifen, isolated or in mixture with other herbicides, in postemergence weed control in a sunflower crop. The experiment was conducted in 1998/99, at the Experimental Farm ofMaringá State University, Paraná State, using the hybrid Morgan 742. The experimental design was randomized block with nine treatrnents and four replications. The evaluated treatments were: control (with and without hoeing), aclonifen (780 and 900 g/ha), quizalofop-p-ethy (75 g/ha), aclonifen +quizalofop-p-ethy (900 +75 and 900 + 100 g/ha), aclonifen +fomesafen (900 +25 g/ha) and aclonifen +chlorimuron-ethyl (900 + 2.5 g/ha). The treatments were applied when the sunflower plants were in V6 to V8, using a carbon dioxide-pressurized backpack sprayer, with a spray volume of 200 Llha. The mixtures of aclonifen + quizalofop-p-ethyl and the quizalofop-p-ethyl alone were seletive for sunflower and efficient in Cenchrus echinatus control, not differing significantly for the control. Ac1onifen.alone or in mixture with fomesafen, chlorimuron-ethyl and quizalofop-pethyl were efficient in the control of Commelina benghalensis and Portulaca oleracea not showing differences between these treatments and the control. Aclonifen alone or in mixture with fomesafen and chlorimuron-ethyl did not cause visual injury to the sunflower crop. The presence of weeds, especially C. echinatus, hindered the harvest and decreased the sunflower yield up to 50.0%. O trabalho teve como objetivo avaliar a seletividade e a eficácia do ac1onifen, isolado ou em mistura com outros herbicidas, no controle em pós-emergência de plantas daninhas na cultura do girassol. O experimento foi conduzido na Fazenda Experimental da Universidade Estadual de Maringá, PR, na safra 1998/99, utilizando o híbrido Morgan 742. O delineamento experimental utilizado foi blocos ao acaso, com nove tratamentos e quatro repetições. Os tratamentos avaliados foram: testemunha sem capina, testemunha capinada, aclonifen (780 e 900 glha), quizalofop-p-ethyl (75 g/ha), aclonifen + quizalofop-p-ethyl (900 +75 e 900 + 100 g/ha), aclonifen +fomesafen (900 +25 glha) e aclonifen +chlorimuron-ethyl (900 +2,5 g/ha). Os tratamentos químicos foram aplicados quando o girassol encontrava-se no estádio V6 a V8, utilizando pulverizador costal pressurizado à base de CO , que proporcionou um consumo de calda de 200 Llha. As misturas de aclonifen +quizalofop-p-ethy 1e o quizalofopp- ethyl isolhdo foram seletivos ao girassol e excelentes no controle de Cenchrus echinatus, não diferindo significativamente da testemunha capinada. O aclonifen isolado ou em mistura com fomesafen, chlorimuron-ethyl e quizalofop-p-ethyl foi excelente no controle de Commelina benghalensis e Portulaca oleracea, não havendo diferenças entre estes tratamentos e a testemunha capinada. O aclonifen isolado ou em mistura com fomesafen e chlorimuron-ethyl não causou injúrias visuais ao girassol. A convivência das plantas daninhas, principalmente de C. echinatus, dificultou a colheita e reduziu a produtividade do girassol em 50,0%.