Gustavo Pereira

• PhD
• Federal University of Viçosa

Saflufenacil is a herbicide recommended for use in the main agricultural crops in Brazil to control eudicotyledonous weeds. However, the application of saflufenacil has been carried out without previous knowledge of this herbicide interactions with soil colloids, which may increase environmental contamination risks. In this study, the leaching of s...

The saflufenacil herbicide has been applied in the agricultural areas as an efficient alternative for the control of resistant weeds to glyphosate. However, the environmental risks from the use of saflufenacil, especially in tropical soil, is not yet clearly known. We evaluated if the organic matter addition into the soil influences the sorption of...

The aim of this work was to study the effect of sub-doses of herbicide nicosulfuron on the levels of chlorophyll and growth of marandu-grass in an forest-livestock integration system. The treatments consisted of eucalyptus consortium with sorghum (BRS 655 hybrid) and forage Urochloa brizantha cv. Marandu (marandu-grass) at 12×2 and 12×3 m spacings...

Genetic modifications of plants can affect their ability to use environmental resources. It is known that the anthropic action has caused global climate changes, such as increases in temperature and drought. In view of this, the objective of this study was to evaluate if the addition of the Bt gene influences the physiological performance of isogen...

Estudos sobre competitividade de culturas com plantas daninhas permitem desenvolver estratégias para seu manejo, pois podem definir as características que confiram maior habilidade competitiva às culturas. Dessa forma, objetivou-se com esse trabalho determinar os efeitos da competição das espécies daninhas braquiária e picão-preto e a combinação da...

O nitrogênio (N) é um dos nutrientes mais extraídos no cultivo de cenoura. No entanto, altas doses de N pode favorecer o crescimento da parte aérea em relação a raiz da planta. A aplicação do metribuzin pode alterar a partição da biomassa em favorecimento das raízes. Desta forma, objetivou-se com esta pesquisa avaliar o efeito da aplicação de metri...

Modern agriculture relies on the massive use of agrochemicals, including herbicides. Despite their effectiveness, a continuous use of herbicides sharing the same target has resulted in the selection of weed biotypes resistant to such chemicals. To cope with this problem, the development of new herbicides is an urgent requirement. In this work we ap...

O controle de plantas daninhas na cultura do cafeeiro é dificultado pela escassez de herbicidas seletivos para a cultura em fase de implantação. Uma alternativa para contornar os danos causados pelos herbicidas é o uso de protetores químicos com capacidade de minimizar a intoxicação dos herbicidas. Objetivou-se avaliar a seletividade de herbicidas...

Existem vários fatores que afetam a fotossíntese, como o déficit físico, o estresse térmico, a concentração de gás interno e externo e a intensidade da luz, no entanto, também pode variar com o material genético ou cultivar avaliado. O objetivo deste estudo foi avaliar as características fisiológicas de setenta e sete genótipos de batata-doce e agr...

The presence of weeds in cabbage cultivation areas causes a reduction in the productivity and quality of the commercial product. Given the difficulties in management and the scarcity of registered products for weed control in cabbage cultivation, this study aimed to evaluate the tolerance of the cabbage cultivars Astrus Plus to the herbicides 2,4-D...

The use of herbicides belonging to a single mechanism of action for several consecutive years in the same area may lead to the selection of weed biotypes resistant to herbicides. Weeds resistant to glyphosate have been problem worldwide. As an alternative control, farmers have used glyphosate mixed with sulfentrazone. When two herbicides are mixed,...

Clomazone exhibits high water solubility, low sorption in soil colloids, and therefore can leach and contaminate deep layers of soil profile and groundwater. In this work, the effect of the incorporation of sugarcane bagasse biochar in leaching and bioavailability of clomazone in red latosol was evaluated. Soil samples amended with 1% (m/m) biochar...

Available information on physical compatibility and stability of pesticide mixtures is scarce and often divergent. This knowledge is of fundamental importance in the success of pest, disease, and weed control programs. Compatibility and stability of two glyphosate formulations (WG and SL) in a mixture with fluazinam + deltamethrin + trifloxystrobin...

Weed management in the pre-transplantation of coffee plants is an essential condition for the future success of the crop. Currently, the producer has few options to perform chemical management at this stage. Therefore, one of the solutions that is being used is the tank mixing of products proven efficient with new products on the market, such as in...

p>Weed management is one of the main and most problematic cultural practices used in coffee plantations. Slow growth, broad spacing associated with scarce registered products for weed control at an early crop stage, are the main problems faced by producers. Therefore, it is desirable for new herbicidal molecules to be registered for this crop, as i...

Sweet sorghum is currently an important alternative for ethanol production in sugar cane off-season. In this study was to evaluate the effects of plant arrangements and the application of atrazine and S-metolachlor on growth and productivity of sweet sorghum. An experiment was conducted in randomized block design and, arranged in split plots with f...

Um dos métodos, eficientes e de baixo custo, para estimar a presença de herbicidas no solo é o biológico. Entretanto, antes de se utilizar este método é necessário identificar espécies que apresentam alta sensibilidade ao herbicida em estudo. Esta pesquisa teve como objetivo selecionar espécies que apresentem alta sensibilidade ao saflufenacil para...

Sorption and desorption determine the amount of an herbicide in soil solution. Therefore, knowledge of the sorption and desorption coefficients in different soils is an essential factor to estimate the potential for environmental contamination by herbicides. We evaluated the feasibility of multivariate and linear discriminant analyses to predict th...

The great diversity of plant species in pastures of the Brazilian Cerrado with distinct ecophysiological characteristics indicates the possibility of finding, in the cellular content of this flora, chemical compounds with potential for use in agriculture and human and animal health. Three steps are necessary to prove this hypothesis: phytochemical...

O nitrogênio aplicado às culturas pode alterar o comportamento das plantas daninhas. Assim, algumas espécies são favorecidas pela presença de adubos nitrogenados em doses elevadas, e outras se mostram indiferentes. A finalidade deste estudo foi verificar os efeitos de diferentes doses de nitrogênio na dinâmica de plantas daninhas da lavoura durante...

O tratamento de sementes com protetores químicos é uma técnica que pode aumentar a tolerância de culturas a herbicidas, sendo já utilizada em culturas como o algodão e o arroz. Este estudo foi proposto para avaliar o efeito do tratamento de sementes com ácido salicílico sobre a tolerância do trigo ao flumioxazin. O delineamento adotado foi o inteir...

The application of desiccant herbicides in the bean crop is fundamental in the production of quality seeds, since it anticipates the harvesting season, which makes it possible to obtain seeds in the period of physiological maturation, when they are reported with maximum accumulation of dry matter, high vigor levels and germination percentage. Howev...

Before recommending an herbicide, it is necessary to know its interactions with the soil attributes that will influence its sorption and half-life in the soil. This knowledge is an essential condition for minimizing any negative effects that may result from its application. However, due to the great diversity of soil and climate in Brazil, especial...

The 2-Chloroethylphosphonic acid (ethephon) and calcium carbide are used to induce and synchronize the flowering of pineapple crop. Some farmers have used the 2,4-D herbicide in combination with these flowering inducers. This practice is based on the hypothesis that 2,4-D would act as a growth regulator, increasing fruit size and weight. The object...

Studies on herbicide behavior in soils may be performed using biological and chemical methods. The efficiency of the biological method depends on the indicator species sensitivity to low herbicide concentrations in the soil solution. Among the herbicides commonly used in Brazil for corn cultivation, tembotrione stands out. In the last agricultural...

The knowledge of the processes that affect soil herbicide behavior allows to developing practices that improve efficiency in chemical weed control and reduce the negative impacts of cropping-systems. In this research, we used HPLC to determine sorption and desorption of clomazone in Brazilian soil samples (Red-Yellow Latosol with liming and without...

In Brazil, sugarcane is grown in large areas. Weed control in sugarcane fields is done by chemical method, since it is more efficient and less expensive. In this method, herbicides that persist in the environment for long periods are used, among which there are hexazinone and diuron, which are applied in mixtures marketed by the industry. This rese...

A composição química e o acúmulo de nutrientes em folhas e frutos do girassol são informações imprescindíveis para se conhecer as exigências nutricionais da espécie. Posteriormente, essas informações podem servir de subsídio para estimar a quantidade dos nutrientes a ser fornecida às plantas por meio da adubação. Dessa forma, objetivou-se com o pre...

Crop–weed competition is extensively studied in weed science. The additive design, in which weed density varies and the crop density is kept constant, is the most commonly utilised design in plant competition studies. The additive design is important to calculate economic weed thresholds and improve weed control decision‐making. Crop–weed competiti...

The possibility of using physic nut oil as an alternative energy source indicates that it is necessary to carry out studies concerning the absorption and accumulation of nutrients in the distinct phases of development of the crop for the appropriate management of fertilizer application. Given this information, this study aimed to evaluate the accum...

El manejo químico de malezas con herbicidas es una actividad recomendada en cultivos, estrategia que permite un control eficaz para el cultivo de piña, que puede afectar su crecimiento y fisiología. De acuerdo a esto, el objetivo de este trabajo es evaluar el efecto de herbicidas de post-emergencia en parámetros de fluorescencia de la clorofila y t...

RESUMO: O feijão é uma cultura de extrema importância econômico-social, e assim como qualquer cultura está sujeito a fatores de natureza biótica, como a interferência de plantas daninhas, ou abiótica, que direta ou indiretamente influenciam não só a sua produtividade biológica, como também o sistema de produção empregado. Diante disso, o trabalho t...

What is expected from an effective antidote, applied with an herbicide, is that it protects crops from damages by the herbicide without reducing its action on weeds. In this context, the goal of this study was to evaluate the effect of liquid fertilizer as a protector of eucalyptus plants and to control signal grass (Urochloa brizantha) submitted t...

As espécies daninhas Commelinea bengalensis (trapoeraba), Ipomoeia grandifolia (corda-de-viola) e Urochloa brizantha (braquiária) são comumente encontradas em competição com a cultura do eucalipto, sendo de difícil manejo com a utilização única de um mesmo herbicida. A avaliação da agressividade dessas espécies, por meio de variáveis fisiológicas m...

Weed control is one of the most relevant costs of sugarcane production. If weeds are not controlled at the right time, the productivity and longevity of sugarcane plantations are reduced. In this crop, chemical control is the most used method, since it is efficient and it has a lower cost. Differentiated tolerance of sugarcane cultivars to the herb...

Glyphosate is a non-selective herbicide used for weed control in eucalyptus forests. Glyphosate drifts are common and may cause serious damage to crops. An alternative to reduce such effects is to use antidotes capable of protecting eucalyptus. An experiment was conducted to evaluate the effects of the application of liquid fertilizer on eucalyptus...

The chemical composition and the accumulation of nutrients in stems, leaves and fruits are essential information to meet the nutritional requirements of a peanut crop. Thus, the goals of the present study were to evaluate the rate of absorption of macro- and micronutrients; identify the critical phases of nutrient absorption in the peanut crop; and...

A produtividade média da cultura do feijoeiro pode ser considerada baixa e entre os fatores que mais impactam nessa perda está a competição com plantas daninhas. Com isso, objetivou-se com esse trabalho quantificar a interferência de duas das principais plantas daninhas que ocorrem na cultura do feijoeiro e o efeito da associação (comunidades) dess...

Dentre os fatores que limitam a expressão do potencial produtivo da cultura do trigo a competição com as plantas daninhas é um dos mais severos causando grandes prejuízos à produtividade e qualidade da produção. Dessa forma, o estudo teve como objetivo avaliar o efeito da competição das espécies E. fosbergii, B. pilosa e G. parviflora, isoladas e e...

Micro-morphological changes precede the appearance of visible damage after herbicide application and are essential in providing data for the safe recommendation in chemical management of weeds. Therefore, the aim of this research was to verify the anatomical changes of leaf tissue caused by application of herbicides in cassava (Manihot esculenta Cr...

O objetivo deste trabalho foi avaliar as exigências nutricionais de mudas de pinhão-manso, bem como o acúmulo e a distribuição de macronutrientes nas diferentes partes da planta, em condições de casa de vegetação. Os tratamentos consistiram de solução nutritiva completa e com omissão de N, P, K, Ca, Mg e S, pelo uso da técnica do elemento faltante....

The chemical control of weed is a necessary practice in large-scale agriculture. However, when herbicides are used in the wrong way, they can remain into soil for long periods and/or be leached in its profile, and they may even contaminate groundwater. In this research, clomazone leaching in soil samples collected from different Brazilian regions w...

This study evaluated the jack bean (Canavalia ensiformis) as a potential remediator of sulfentrazone in the soil. The experiment was conducted under field conditions in a complete randomised block design. The treatments consisted of soils with and without herbicide application as well as the absence and presence of C. ensiformis cultivation associa...

The use of antidotes capable of protecting eucalypt damage caused by glyphosate herbicide that allows changes in application techniques, making them simpler and cheaper operations. In this sense, the objective was to evaluate the protective effect of Fertiactyl Pós® on eucalypt plants submitted the application of glyphosate. The experiment was cond...

Plants compete for several resources on soil, including water, light and nutrients which can affect crop yield and also weeds growth. Under the hypothesis that in different densities and weed communities, crops and weeds undergo changes in their nutritional contents of macro and micronutrients, the aim of this study was to quantify the nutritional...

Resumo Information about nutrient uptake and accumulation by different crops during development stages allows iden­tifying periods of higher demand and an adequate fertilization management. An experiment under field condi­tions was carried out in order to evaluate macro and micronutrient accumulation in castor bean leaf tissue, as well as to ident...

Herbicides with high mobility can leach to deeper layers of the soil and to contaminate underground aquifers. The potential of herbicide leaching in soil can be monitored by chromatography or bioassay methods. This study evaluated the leaching of imazethapyr, imazapic and its commercial mixture (imazethapyr + imazapic) in three tropical soils via a...

O conhecimento das alterações na comunidade infestante provocado pelo manejo de plantas daninhas é importante para definição de estratégias eficientes para o controle destas. Realizou-se um experimento de campo para avaliar os efeitos do uso de herbicidas em diferentes alturas de barra na dinâmica de plantas daninhas e produtividade do feijoeiro. A...

Knowledge of herbicides sorption by colloids predicts its movement in the soil profile and its effectiveness in controlling weeds and crops poisoning when directly applied to the soil. This knowledge becomes even more important for herbicides which have long persistence in the soil. In this research, clomazone sorption was estimated by the biologic...

Intercropping is a common practice among farmers in tropical regions of the world and has persisted for years, not only for traditional reasons, but also for certain advantages that helped in its ecological adaptation. In regard to low income farmers with small areas for cultivation, more attention should be given to the cost of production and bett...

Biostimulants are complex substances that promote hormonal balance in plants, favor the genetic potential expression, and enhance growth of shoots and root system. The use of these plant growth promoters in crops can increase quantitatively and qualitatively crop production. Therefore, the aim of this study was to evaluate the effect of a commercia...

O objetivo deste trabalho foi avaliar o crescimento inicial e as características fisiológicas do eucalipto submetido a diferentes manejos do capim-braquiária. O experimento foi realizado em ambiente protegido, no delineamento de blocos casualizados com cinco repetições. Os tratamentos foram arranjados em esquema fatorial (5 x 2) + 1, sendo o primei...

O sucesso na exploração comercial da cenoura depende da escolha de cultivares com boa adaptação às condições de solo e de clima no local onde será cultivada e da boa aceitação pelo mercado consumidor. O objetivo do presente trabalho foi avaliar o desempenho de cultivares de cenoura no cultivo de outono-inverno em dois municípios com características...

The successful commercial use of carrot depends on the choice of cultivars that are well-adapted to soil and climate conditions at the cultivation site and on good consumer acceptance. The objective of this study was to evaluate the performance of carrot cultivars grown in autumn-winter in two towns with different climatic characteristics, in the H...

O Brasil é o principal produtor de maracujá do mundo, todavia, para esta cultura não existe registro de herbicidas no controle de plantas daninhas. Sendo assim, o objetivo deste experimento foi avaliar os efeitos da aplicação de herbicidas após o transplantio de mudas de maracujá amarelo no crescimento e intoxicação da cultura. Foram testados 21 he...

Inadequate herbicide application can result in failures in weed control and/or poisoning of the crops, resulting in yield losses. In this research were assessed the effects of the sprayer nozzle boom height in the distribution of the spray solution for weed control, influencing intoxication of beans and crop yield. Experiments were conducted in lab...

Nos cultivos consorciados, a competição entre as espécies pelos recursos do meio pode inviabilizar o sistema. A intensidade da interferência de uma espécie sobre a outra, resultante dessa competição, depende da densidade populacional das espécies componentes do sistema. Na busca de melhor entendimento desses efeitos, avaliaram-se os efeitos de dens...

Analysis of chlorophyll a fluorescence has been used to improve the understanding of the mechanisms of photosynthesis, as well as in the evaluation of plant photosynthetic capacity altered by biotic or abiotic stresses. The objective of this study was to evaluate the sensitivity of cassava plants to herbicides with different mechanisms of action, a...

Under tropical environments, the soil seed bank ensures floristic diversity and raises the ability of weeds to infest the area repeatedly whn weed/soil management practices are applied. The objective of this study is to identify weed species emerged phytosociologically from different depths in soils with distinct uses. The trial was carried out wit...

The carrot (Daucus carota) is the fifth most widely grown vegetable crop in Brazil, with an average yield of only 32.1 t ha-1 with productive potential to reach 80 t ha-1. One reason cited for this low productivity is planting varieties not adapted to the environments found in Brazil. Knowing the importance of genotype and environment interaction,...

There is little information in the literature on herbicides for post-emergence application of cassava and its potential impacts on soil microbial activity. Thus, the aim of this work was to evaluate the effect of postemergence herbicides in total area and direct microbial activity in soil cultivated with cassava, as well as its effect on weed contr...

São poucas as informações na literatura sobre herbicidas para aplicação em pós-emergência da cultura da mandioca e seus possíveis impactos na atividade microbiana do solo. Dessa forma, objetivou-se com este trabalho avaliar o efeito da aplicação de herbicidas pós-emergentes em área total e dirigida na atividade microbiana de solo cultivado com mand...

Fertilizers may be used to change the competitive relations, favoring the crop species, providing the competing species have different responses to the nutrient application. Thus, the aim of this study was to evaluate the growth of Cassava plant, Bidens pilosa L. and Brachiaria decumbens Stapf, as a function of the amount of P supplied at planting....

A adubação verde constitui prática cultural de relevante impacto positivo em sistemas de produção agrícola que visam o uso sustentável da terra. Objetivou-se com esse trabalho avaliar o desempenho de seis leguminosas utilizadas para adubação verde, quanto à produtividade de fitomassa, cobertura do solo e uso da radiação fotossinteticamente ativa na...

This study aimed to evaluate the effect of atrazine + nicosulfuron on soil microbial activity, under the conventional and no-tillage systems. The experiment was carried out in an area of maize-brachiaria intercropping, where atrazine + nicosulfuron were applied at (1,500 + 10 and 1,500 + 30 g h-1) with a weed-handed area being maintained without pr...