Abstract:The aim of this article is to investigate the social representations of childhood in a group of women interveners in two dimensions: 1) migrant childhood, like actor that demands intervention in a pandemic; and 2) the experience of childhood of the women is analyzed, from a biographical approach. A qualitative methodology was used, through a self-administered questionnaire, in electronic format. A content and intersectional analyses were applied. The sample consisted of twenty-four professional, technical and volunteer women of various nationalities who work in NGOs in regions of the northern and central zone of Chile. It is concluded that the intervening women identify a representation of migrant children as a lacking subject, in a situation of helplessness and violation of rights that affect their quality of life, even more so in a time of health crisis and scarce institutional response. As a counterpoint, the childhood experience of the intervening women emerges as a diverse representation, where the protagonism of an acting subject who speaks in the first person is visible, even in adversity. Thus, the intersectional analysis of the representation -or representations- of childhood -or childhoods- becomes an input that nourishes praxis.

Resumen: El objetivo de este artículo es indagar en las representaciones sociales de infancia de mujeres interventoras, en dos dimensiones: 1) la infancia migrante como actor que demanda intervención en pandemia; y 2) la propia experiencia de infancia de las mujeres interventoras, en tanto subjetividad. Se utilizó una metodología cualitativa, mediante cuestionario autoadministrado, en formato electrónico. Se aplicó un análisis de contenido e interseccional. La muestra estuvo constituida por veinticuatro mujeres profesionales, técnicas y voluntarias, de diversas nacionalidades que trabajan en organizaciones no gubernamentales en regiones de la zona norte y centro de Chile. Se concluye que las mujeres interventoras identifican una representación de la niñez migrante como un sujeto carente, en situación de desamparo y vulneración de derechos que afecta su calidad de vida, más aún en una época de crisis sanitaria y escasa respuesta institucional. Como contrapunto, la propia experiencia de infancia de las mujeres interventoras emerge como una representación diversa, donde se visibiliza el protagonismo de una sujeta actuante que habla en primera persona, incluso en la adversidad. Así, el análisis interseccional de la representación -o representaciones- de la infancia -o infancias- se torna en un insumo que nutre la praxis.

Resumo: O objetivo deste artigo é investigar nas representações sociais da infância de um grupo de mulheres interventoras, em duas dimensões: 1) a infância migrante, como um ator que demanda intervenção em pandemia; y 2) a vivência da infância das intervenientes, a partir de uma abordagem biográfica. Utilizou-se uma metodologia qualitativa, por meio de questionário autoaplicável, em formato eletrônico, que evidenciou o uso da chamada linguagem inclusiva e foi aplicada uma análise de conteúdo e interseccional. A amostra foi composta por vinte e quatro mulheres profissionais, técnicas e voluntárias de várias nacionalidades que trabalham em organizações não governamentais nas regiões da zona norte e centro do Chile. Conclui-se que as mulheres intervenientes identificam uma representação da criança migrante como sujeito carente, em situação de desamparo e violação de direitos que afeta a sua qualidade de vida, ainda mais num momento de crise de saúde e pouca resposta institucional. Em contraponto, a experiência de infância das intervenientes surge como uma representação diversa, onde é visível o protagonismo de um sujeito agente que fala na primeira pessoa, mesmo na adversidade. Assim, a análise interseccional da representação -ou representações- da infância -ou da infância- torna-se um insumo que alimenta a práxis.

ABSTRACT Statistical process control has been widely used in agricultural operations for monitoring and improving process quality. This study aims to evaluate the Shewhart and exponentially weighted moving average (EWMA) control charts to monitor the performance of an agricultural tractor–planter set. The design is completely randomized based on the assumptions of statistical process control and comprises two treatments: day and night shift treatments. The data to assess the performance of the tractor–planter set are collected during the day and night shifts and used to evaluate the operating speed, motor rotation, engine oil pressure and water temperature, and hourly fuel consumption. The dataset comprised 40 samples compiled from the frontal monitor column inside a tractor cab. It is concluded that both Shewhart and MMEP/EWMA control charts can be used to evaluate engine performance based on the quality indicator parameters investigated, regardless of the normality assumption of the datasets.

ABSTRACT Sugarcane mechanized harvesting can lead to serious risks to the longevity of plantations when improperly operated, and may cause damages and disturbances in the remaining ratoons in the field. In this sense, this study aimed to evaluate the damage and disturbance to the sugarcane ratoons by the base cutting quality of two-blade models through statistical process control. The experiment was carried out during the 2015/16 growing season in an agricultural area of the Moreno Mill, located in Cravinhos, São Paulo, Brazil. The sugarcane harvester models A8800 (Machine 1) and BE1035 (Machine 2). The sugarcane variety cultivated in both treatments was SP80-1816. Thirty points were sampled per harvester, with 10-minute intervals between them. Equations were used to calculate the indices, which were then evaluated through descriptive analysis and statistical process control. Machine 2 presented process instability for the index of damages, with lower data variability. On the other hand, Machine 1 presented instability during the process due to the quality indicator and index of disturbance, but with a lower operation variability.

Abstract Aim: The present study aimed to verify the cardiac oxidative stress biomarker responses to high-intensity interval training (HIIT) in rats. Methods: Sixteen male Wistar rats weighing 250 to 300 g were equally divided into two groups (8 animals/group): sedentary control (SC) and trained group (HIIT). The exercise protocol consisted of high-intensity swimming (14% of body weight, 20 s of activity with 10 s of pause performed 14 times) which was performed for 12 consecutive days. Results: The cardiac tissue concentrations of malondialdehyde and carbonylated proteins showed no significant changes; on the other hand, hydroperoxide levels were higher in the HIIT group than in the SC group. The activities of superoxide dismutase, catalase, and glutathione peroxidase enzymes and the levels of reduced glutathione and sulfhydryl remained unchanged. Conclusion: It is possible to conclude that short-term high-intensity interval training induces changes in the cardiac oxidative stress biomarker but with no effect on the antioxidant enzymes.

RESUMO Este artigo aborda a relação entre a formação de professores e a importância da Educação Científica na Educação Infantil e anos iniciais do Ensino Fundamental, de forma a trazer indicativos para a aprendizagem inicial docente no trabalho com as crianças. Para tanto se recorreu às narrativas dos estudantes do curso de Pedagogia de uma universidade pública brasileira, que após realizarem visitas a campo para observar a prática pedagógica de professores puderam ampliar as perspectivas acerca do ensino de Ciências atrelado às especificidades da infância. Ficou evidente a necessidade de atividades sensoriais e lúdicas pautadas na experimentação, com visitas e passeios externos como fundamentais para o ensino de Ciências para as crianças, bem como ficou claro que os sentimentos de participação e pertença atrelados à formação cidadã na Educação Científica favorecem a aprendizagem das crianças para desvelar os fenômenos do mundo de forma crítica e reflexiva.

ABSTRACT This article addresses the relationship between teacher education and the importance of Science Education in early Childhood Education and early years of Elementary School, in order to bring indications for the initial teaching learning in working with children. To this end, a recourse was made to the narratives of students in the Pedagogy course, from a Brazilian public university, who, after making field visits to observe the pedagogical practice of teachers, were able to broaden the perspectives about Science teaching linked to the specificities of childhood. The need for sensory and ludic activities based on experimentation became evident, with visits and outings as essential for teaching Science to children, as well as it became clear that the feelings of participation and belonging linked to citizen education in Science Education favors the learning of children to unveil the phenomena of the world in a critical and reflective way.

ABSTRACT The mechanized sugarcane harvesting process is considered one of the major economic bottlenecks, with low operational efficiency and, mainly, high losses of stalks left in the field. In order to minimize these problems and assist in the improvement of processes, this study aimed to evaluate the losses in the mechanized sugarcane harvesting using statistical process control. The experimental design was completely randomized, based on the methodology of statistical process control with samples collected on five work fronts during the daytime and nighttime operation. The experiment was carried out in an agricultural area of a sugarcane mill in the municipality of Ribeirão Preto, SP, Brazil, on five sugarcane harvest fronts. Losses were measured using a 3.0 × 3.33-m frame, being divided into stump, loose piece + fixed piece, whole sugarcane, fragment, and total losses for each harvest front. The data were grouped into 50 weeks over the sugarcane-growing season, and statistical analyses were performed using the Minitab 16® software. Losses of loose piece + fixed piece were higher than the losses of stump, whole sugarcane, and fragment. The total losses showed higher and lower losses for the fronts F5 and F4, respectively, compared to the others.

Resumo Falar de participação infantil remete a distintos graus e possibilidades em que as crianças tenham suas opiniões consideradas e possam exercer a cidadania por meio de processos iniciados por adultos ou por elas, mas que haja relações de equilíbrio de poder e parceria. Frequentemente, a participação das crianças é referida em projetos de forma decorativa, usando as falas das crianças, para reafirmar que elas estiveram envolvidas nos processos e tiveram suas vozes consideradas. Entretanto, essa ilustração remete apenas a etapas de não participação das crianças e que demandam repensar conceitos que envolvem esse complexo processo. Atentando-se a essas questões, o presente texto procurou compreender como ocorre a participação das crianças pequenas na Plenarinha no Distrito Federal proposta pela Secretaria de Estado de Educação. Por meio de uma pesquisa qualitativa, que fez uso de análise documental, buscou-se verificar nos textos oficiais publicados e notícias vinculadas no jornal Correio Braziliense se o programa considerava a voz das crianças na implementação de mudanças na educação infantil. Após análise dos documentos, pode-se referir que o programa não contemplou as infâncias presentes nas instituições de educação infantil, bem como ocultou nos documentos como os processos de participação das crianças ocorreram. Nota-se que a perspectiva adultocêntrica coloca-se como um impeditivo para legitimar a ação social das crianças, que têm sua competência comparada a padrões adultos, e que acabam por invisibilizar esse grupo minoritário, que historicamente esteve à margem da participação social.

Abstract Talking about children´s participation leads to different degrees and possibilities in which children would have their opinions taken into account and practice citizenship through processes started by adults or by the children themselves. Instead, there should be balanced power relations and partnership. Often, children´s participation is decoratively mentioned in projects that utilize the children´s speech only to reassert that children were involved in processes and had their voices heard. However, such illustration has to do only with the absence of children´s participation and the concepts around this complex process should be reassessed. Paying attention to that, this paper has sought to understand how small children participate in the Plenarinha (little plenary) in the Federal District as proposed by its Education Department. By means of a qualitative research utilizing documental analysis, the aim was to screen the official texts that had been published and the news stories appearing in the newspaper Correio Braziliense to check whether the program took the children´s voice into consideration when implementing changes in child education. Upon the analysis of the documents, it may be said that the program did not include the childhoods present in the child education´s institutions and, also, the program´s documents concealed how the processes of children´s participation took place. It is noted that the adult-centered perspective represents an obstacle to legitimate the children´s social action, as children have their competency compared to adult standards. This eventually makes this minority group invisible, as they have historically been marginalized from social participation.

RESUMO Analisar o impacto da corrida em diferentes humidade relativa (HR) (normal (53%), muito alto (94%)), estado de hidratação (EH), taxa de transpiração (TT), freqüência cardíaca (FC), esforço percebido (RPE). Quatorze homens (25,2 anos) realizaram duas sessões de corrida em esteira. Massa corporal (HR normal: -1,35%, HR muito alta: -1,65%) e EH reduziram (HR normal: -14,8%, HR muito alta: -20,8%), RPE (HR normal: + 26%, HR muito alta: + 28%), aumento da FC (HR muito alta: + 5.8%: 20-40 min, + 3.1%: 40-60 min, HR normal: + 3%: 20-40 min; + 2.3%: 40-60 min). TT foi significantemente diferente entre HR (HR normal: -14.8%, HR muito alta: -20.8%). Há um impacto negativo na corrida em EH, massa corporal, FC e RPE em homens com HR normal e muito alta, e TT é mais afetada com HR muito alta.

ABSTRACT The purpose of this study was to analyze the impact of running in normal relative humidity (RH = 53%) and very high RH (94%) on hydration status (HS), sweating rate (SR), heart rate (HR), and rating of perceived exertion (RPE). Fourteen men (25.2 ± 6.6 yrs) performed two sessions of treadmill running. Body mass (normal RH: -1.35%, very high RH: -1.65%) HS (normal RH: -14.8%; very high RH: -20.8%) were reduced while RPE (normal RH: +26%; very high RH: +28%) and HR were increased (very high RH: +5.8%: 20-40 min, +3.1%: 40-60 min, +3%: 20-40 min; +2.3%: 40-60 min for normal RH). As expected, SR was significantly greater during very high RH (-20/8%) compared to normal RH (-14.8%). Running in very high RH at moderate temperature has a greater negative impact on SR, HS, body mass, HR, RPE in men than running in normal RH at the same temperature, which places the runner in greater danger of heat illnesses such as heat exhaustion or heat stroke.

RESUMEN El objetivo de este estudio fue analizar las repercusiones de correr con diferentes niveles de humedad relativa (HR) (normal [53%], muy alta [94%]) sobre el estado de hidratación (EH), la tasa de sudoración (TS), la frecuencia cardíaca (FC) y el esfuerzo percibido (EP). Catorce hombres (25,2 ± 6,6 años) realizaron dos sesiones en cinta de correr. La masa corporal (HR normal: -1,35%; HR muy alta: -1,65%) y el EH (HR normal: -14,8%; HR muy alta: -20,8%) se redujeron, mientras que el EP (HR normal: +26%; HR muy alta: +28%) y la FC (HR muy alta: +5,8%: 20-40 min; +3,1%: 40-60 min; HR normal: + 3%: 20-40 min; + 2,3%: 40-60) aumentaron. La TS fue considerablemente diferente entre las HR (HR normal: -14,8%; muy alta HR: -20,8%). Hay repercusiones negativas por correr con una HR muy alta y una temperatura moderada en TS, EH, masa corporal, FC y EP en corredores que corren a una HR normal a la misma temperatura, lo que sitúa a estos en gran peligro de sufrir un enfermedad provocada por el calor, como agotamiento por calor o golpe de calor.

ABSTRACT The mechanized harvesting of sugarcane has increased exponentially in recent years because of the gradual prohibition of burning on the cane fields in mechanizable and non-mechanizable areas. This study aimed to evaluate the wear of the basal cutting knives in two different mechanized sugarcane harvesters, through statistical process control. The experiment was conducted in Cravinhos, São Paulo, in an agricultural area, on July 25, 26, and 27, 2016. Two harvesters with different basal cutting mechanisms were evaluated: harvester A—Model BE1035e (conventional type knife), and harvester B—Model A8800 (racket type knife). The experimental design was completely randomized with two treatments. The wear was quantified by measuring the thickness increase and width losses of each knife, and it was evaluated for each harvester every 2 hours, during 3 days of operation. Data were evaluated using descriptive statistics and statistical process control. The harvester B model (racket knife) presented lower variability in the cutting width and stability in the cutting width of the knives. The harvester A model (conventional knife) presented greater wear in the width, but less variability in the thickness of the cutting wire.

RESUMO O direcionamento automático de máquinas agrícolas via sinal GNSS (Global Navigation Satellite System) tem sido adotado cada vez mais pela comunidade agrícola na última década. Produtores de amendoim estão adotando tal tecnologia a fim de melhorar o paralelismo das operações face às dificuldades principalmente encontradas no arranquio mecanizado, onde as perdas são, todavia, um grande problema. Objetivou-se avaliar as operações mecanizadas de semeadura e de arranquio de amendoim controlados manualmente e com piloto automático, juntamente com a qualidade das operações. Os tratamentos consistiram de duas operações de escavação, com e sem piloto automático, e duas velocidades de deslocamento (4,5 e 6,0 km h-1). O experimento foi realizado em solo de textura média, sob delineamento inteiramente casualizado disposto em faixas, utilizando-se das variáveis analisadas como indicadores de qualidade. Na semeadura foi avaliado o paralelismo entre as passadas do conjunto trator-semeadora em 120 pontos de cada sistema (direcionamento manual e automático). Foram avaliadas as perdas de arranquio nos dois sistemas de direcionamento sob duas velocidades de deslocamento (4,5 e 6,0 km h-1), em 15 pontos de cada tratamento. Verificou-se que o paralelismo entre as passadas do conjunto trator-semeadora foi melhor quando se utilizou do piloto automático, além da maior qualidade da operação. A velocidade de deslocamento não influenciou as perdas de arranquio. Não houve diferenças nas perdas visíveis de arranquio, porém quando o arranquio foi realizado com o piloto automático obteve-se maior qualidade. Menores perdas invisíveis e totais de arranquio foram obtidas quando o arranquio foi realizado com o direcionamento automático, e qualidade superior foi obtida na velocidade de 4,5 km h-1; porém, a qualidade foi afetada negativamente sob operação manual. Portanto, o uso do piloto automático se mostrou eficaz na melhoria da precisão e da qualidade das operações.

ABSTRACT Over the past decade, automatic guidance of agricultural machinery via Global Navigation Satellite System (GNSS) signals has been increasingly adopted by the farming community. Peanut farmers are adopting such technology in order to improve the parallelism of operations to address difficulties that occur in mechanical digging, where losses are a big problem. This study aimed to evaluate mechanized operations of peanut sowing and digging controlled manually and by autopilot, along with their quality. The treatments consisted of two digging operations, with and without autopilot, and two displacement speeds (4.5 and 6.0 km h-1). The experiment was conducted in a medium-textured soil in a completely randomized design arranged in bands, using the analyzed variables as quality indicators. At sowing, parallelism between passes of the tractor-sower set, was evaluated at 120 points of each system (manual and automatic routing). The digging losses were evaluated in the two guidance systems, under two displacement speeds (4.5 to 6.0 km h-1) at 15 points per treatment. It was verified that the parallelism between the passes of the tractor-sower set was better when using the autopilot, which improved the operation quality. Displacement speed did not influence the digging loss. There were no differences in the visible digging loss, but higher quality was obtained when the operation was performed using autopilot. Minor invisible and total digging losses were obtained when the digging was performed with automatic routing, and superior quality was found at a speed of 4.5 km h-1; however, quality was adversely affected under manual operation. Thus, the use of autopilot is effective for improving the accuracy and the quality of the operations.

ABSTRACT Work in the field is characterized as unstructured because it is performed in inconvenient postures, without a fixed workstation, exposing the worker directly to the sun and other inclement weather. This may interfere in the health and the performance of the activity. The objective of this work was to characterize the environment of the agricultural microtractor operator, evaluating the thermal comfort during the activity in the municipality of Quixadá, CE. A model TC14 Super Yanmar Agritech microtractor, coupled to a rotary spindle, was used. For the measurements of the environmental variables, sensors and devices were installed on the operator and in the microtractor. The experimental design adopted the assumptions of statistical quality control. Fifteen collections were done daily at different times for three consecutive days. The data obtained were indices of thermal discomfort and thermography, both of which were analyzed by sequential graphs (run charts), control graph (Xbar-R chart), and scatter plot. At all rates, the work performed proved to be inadequate, exceeding the operator's capabilities and limitations. It was concluded that the activity performed by the microtractor operator is stressful. Measures should be taken to improve working conditions without affecting the operator's health.

Abstract The objective of this study was to develop, analyze composition and evaluate the microbiological and sensory characteristics of high-protein diet bars (PB) with the addition of chia grain (Salvia hispanica L.), partially replacing isolated soy protein and concentrated whey protein, in proportions of 0, 10, 15 and 20%. The proximate composition was analyzed of PB, for microbiological quality of Bacillus cereus, Filamentous fungi and yeast count, total fecal coliforms, and Salmonella ssp. search. Sensory analysis was performed utilizing acceptance testing of characteristics on a nine-point hedonic scale for various attributes, including purchasing intention of the tested PB. Bars showed 20% moisture, 2.3% ash, 20-23% protein and 19% lipids. The effect of increasing of chia was to increase crude fiber content and decrease total carbohydrate and total energy value. All samples were within the microbiological food standards established by current legislation. All PB formulations obtained a good overall impression index and all characteristics were above mean grades, with the exception of taste (63%) in the PB containing 0% chia. Chia grain has a positive influence on sensory aspects and appears to be an alternative way to increase the nutritional quality of high-protein diet bars.

Resumen (descriptivo): Los estudios sociales de la infancia en Sudamérica están ganando visibilidad en las publicaciones, así como en la agenda pública en este continente. En esta investigación llevé a cabo la recopilación de datos mediante la búsqueda exhaustiva de publicaciones sobre la infancia desde la perspectiva de la sociología de la infancia en los países hispanohablantes. Los países con mayor producción son Argentina, Chile, Colombia, Ecuador y Perú. Mi propósito es identificar y examinar los diversos aspectos de estas temáticas en las producciones, con el fin de reconocer quiénes son los académicos y académicas que hablan de los niños y niñas y de la niñez en este continente, y qué dicen sus producciones sobre el protagonismo y la participación infantil. Palabras clave: participación de los niños y niñas, producción científica, búsqueda bibliográfica, infancia, Sudamérica (Tesauro de Ciencias Sociales de la Unesco).

Abstract (descriptive): Studies on childhood in South America are gaining more prominence in scientific publications as well as in the public agenda in the region. This study involved an exhausting data search of publications in Spanish-speaking countries that focus on children using the sociology of childhood perspective. The countries with the highest number of publications in this area were Argentina, Chile, Colombia, Ecuador and Peru. The overall purpose of the research is to identify the academic researchers that are leading the discussion on children and childhood within South America, the nature of their work, and how their work relates to the areas of children’s protagonism and participation. Key words: Children’s participation, scientific production, bibliographic review, childhood, South America (Unesco Social Sciences Thesaurus)

Resumo (descritivo): Os estudos sociais da infância na América do Sul estão ganhando visibilidade nas publicações, assim como na agenda pública deste continente. Esta investigação realizou a busca de dados por meio da busca exaustiva por publicações sobre a infância a partir da perspectiva da sociologia da infância nos países hispanófonos. Os países que apresentam maior produção são Argentina, Chile, Colômbia, Equador e Perú. Há a intenção de identificar e examinar os diversos aspectos destas temáticas nas produções, com a finalidade de reconhecer quem são os acadêmicos que falam das crianças e da infância neste continente e o que nos diz suas produções sobre o protagonismo e a participação infantil. Palavras-chave: participação das crianças, produção científica, revisão bibliográfica, infância, América do Sul (Thesaurus de Ciências Sociais da Unesco).

RESUMO O sucesso da lavoura de soja depende de diversos fatores, entre eles cita-se a utilização de sementes de elevada qualidade fisiológica a fim de garantir a obtenção da população de plantas desejada na lavoura. Dessa forma, objetivou-se, por meio das ferramentas do Controle Estatístico de Processo (CEP), monitorar possíveis falhas no processo de produção das sementes e buscar relação entre os testes de germinação e tetrazólio. O delineamento experimental foi baseado nas premissas do CEP, utilizando como indicadores de qualidade a porcentagem de germinação, viabilidade das sementes, danos mecânicos, por percevejo e por umidade. Foi possível detectar falhas no processo de produção de sementes de soja por meio das cartas de controle, dos testes de germinação e tetrazólio, sendo principalmente estas causas relacionadas a danos mecânicos e ataque de percevejos.

ABSTRACT The success of soybean cultivation depends on several factors, one which is the use of high-quality seeds, which can guarantee growth of the desired plant population. The objective of this study was to monitor possible failures during the seed production process, and to determine the association between germination and tetrazolium tests through tools of Statistical Process Control (CEP). The experimental design was based on premises of the CEP, using percentage of germination, seed viability, mechanical damage, bed bug, and moisture as indicators of quality. It is possible to detect flaws in the soybean production process through control charts, as well as through germination and tetrazolium tests; results indicated that germination failures are largely caused by mechanical damage and bed bug attacks.

RESUMO A qualidade da colheita mecanizada de soja é essencial para garantir que todo investimento realizado nas demais etapas do processo produtivo da cultura seja convertido em lucro para o produtor. Considerando que a qualidade dessa operação está relacionada com menores perdas e que a plataforma de corte utilizada e a velocidade de colheita podem influenciar nisso, objetivou-se avaliar a qualidade da colheita mecanizada da soja, no Cone Sul de Rondônia, em colhedoras com diferentes plataformas de corte e velocidades de deslocamento por meio do controle estatístico de processo. O experimento foi realizado na safra 2015/16 em uma área agrícola no município de Cabixi, RO, localizada nas coordenadas geográficas 13º 27’ S e 60º 41’ W. O delineamento experimental foi estabelecido de acordo com as premissas do controle estatístico de processo, sendo amostrados 80 pontos distanciados a cada 100 m. Avaliaram-se as perdas na plataforma, nos mecanismos internos e totais e a altura de corte. A melhor qualidade do processo de colheita foi obtida na plataforma de esteira, com pouca influência da velocidade de deslocamento. O nível de perdas na colheita foi acima do limite aceitável, indicando necessidade de melhorias do processo.

ABSTRACT Assuring the quality of mechanical soybean harvesting is crucial to ensure that investment in other stages of crop production is converted into profit for the farmer. Because the quality of this operation is related to decreased losses, which may be affected by the combine header used and by the harvesting speed, the aim of the present study was to assess the quality of mechanical soybean harvesting in the Southern Cone of Rondônia, using harvesters with different combine headers and travel speeds via statistical process control. The experiment was performed during the 2015/16 harvest in an agricultural area of the municipality of Cabixi, RO, located at the geographical coordinates 13° 27’ S and 60° 41’ W. The study was designed based on the premises of the statistical process control, sampling 80 points 100 m apart. Combine header, internal, total, and cutting height losses were assessed. Quality of the harvesting process was assessed using the draper header. Travel speed had little effect on process quality. Crop losses were higher than the acceptable limit, indicating the need to improve the process.