Osmar Pias

Osmar Pias
Universidade Federal de Santa Maria · Department of Agricultural and Environmental Sciences

About

37
Publications
6,117
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244
Citations
Citations since 2017
18 Research Items
229 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
Skills and Expertise

Publications

Publications (37)
Article
Full-text available
Precision agriculture (PA) stands out as an innovative way to manage production resources, increasing the efficiency and the socioeconomic and environmental sustainability of agricultural systems. In Brazil, the principles and tools of PA started to be adopted in the late 1990s. To reveal the scientific trajectory and advances in PA taken over the...
Chapter
The agricultural practices introduced by European colonisers have been practiced in South America for many years, resulting in depletion of the soil’s natural fertility. The introduction of fertilisers and acidity amendments occurred in the mid-1960s and boosted production of many areas, but still with high soil erosion and low levels of organic ma...
Article
Full-text available
Although numerous studies have been conducted with common bean regarding nitrogen (N) dose, time of application, and source in no-till (NT) soils in Brazil, the heterogeneity of the results makes it difficult to establish technical recommendations based on individualized studies. This meta-analysis aimed to rank the main factors influencing common...
Article
Full-text available
A good soil fertility management for soybean production must consider the amount of nutrients that are exported by seeds. In recent decades, soybean yield has increased due to better crop management and genetic improvements, which may affect the amount of nutrients removed. Therefore, this study aimed (i) to analyze the relationship between the con...
Article
The primary aim of this work was to assess the effect of rates of gypsum used alone and in combination with limestone on (a) soil nutrient contents and acidity, and (b) soybean and maize yields, on a subtropical coarse-textured Ultisol with a low cation exchange capacity (CEC) under no-tillage (NT). For this purpose, a field experiment using differ...
Article
Full-text available
The use of hybrid genotypes is a good alternative for increasing the flooded rice yield. However, there is a need for validation of the fertilizer management under different edaphoclimatic conditions and its greater profitability. This study aimed to evaluate the grain yield and profitability of rice hybrids in relation to N doses and fertilization...
Article
Improving the chemical conditions for plant growth in the subsoil is especially difficult in no‐till (NT) soil because the low solubility of limestone. In this situation, gypsum may be recommended due to its high capacity of mobilizing exchangeable Ca2+ and other basic cations associated to SO42– anions mainly in the soil profile, thereby alleviati...
Article
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In agricultural areas with a historical of systematic soil sampling, alternative methodologies such as directed sampling design based on management zones (MZ) have been proposed to reduce sampling costs. The aim of this study was to evaluate the technical and economic impacts of replacing a dense systematic soil sampling design (cell size of 0.5 ha...
Article
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An uneven seed spacing in the sowing row increases the plants intraspecific competition for environmental resources, potentially lowering grain yields. This study aimed to assess the yield and yield components of common bean plants, as a function of coefficients of variation (0 %, 20 %, 40 % and 60 %) of seeds in the sowing row. The main yield comp...
Article
The objective of this study was to evaluate the short-term dynamics of chemical species of sulfate and the main basic cations in the soil solution affected by the application of different sulfur (S) rates using agricultural gypsum. The experiment was carried out in an Ultisol with 14% clay, managed under no-tillage for 14-yr in Southern Brazil. Fou...
Article
Full-text available
Sulfur (S) fertilization recommendations for grain crops in Brazil were formerly established from studies on crops with a low yield potential grown on soils under conventional tillage (CT). However, the subsequent adoption of no-tillage (NT) altered S dynamics in the soil, making it necessary to carefully evaluate the applicability of these S ferti...
Article
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O cultivo fora do período normal para a cultura do feijoeiro denominada safrinha é uma alternativa, contudo o manejo da adubação nitrogenada deve ser ajustado considerando as doses e épocas de aplicação. Para isso, objetivo deste estudo foi avaliar as variáveis biométricas e produtivas das cultivares de feijoeiro “Gralha” e “Olho de Pomba”, semeada...
Article
O deficit hídrico e a deficiência nutricional são os principais fatores limitantes da produtividade da cultura do milho. Nesse sentido, objetivou-se com este estudo, avaliar os componentes de rendimento e a produtividade de grãos de híbridos de milho em função de níveis de adubação e de deficit hídrico em dois estádios fenológicos. O estudo foi rea...
Article
Full-text available
ABSTRACT The use of gypsum to improve the root environment in tropical soils in the southeastern and central-western regions of Brazil is a widespread practice with well-established recommendation criteria. However, only recently gypsum began to be used on subtropical soils in South of Brazil, so available knowledge of its effect on crop yield is i...
Article
Full-text available
There is no consensus in the literature regarding how many subsamples are needed to perform accurate on-farm soil penetration resistance (SPR) mapping. Therefore, the objective of this study was to define the number of subsamples per sampling point needed to quantify the SPR. The experiment was performed in a 4.7 ha area and employed a 50 × 50 m gr...
Article
The water stress is the most limiting factor for germination of maize seeds, in this sense, to know more tolerant hybrids to this factor is essential for productive sustainability of the culture. The objective of this study was to evaluate the seed germination and seedling growth of maize hybrids submitted to water stress. The study was conducted i...
Article
Full-text available
Euschistus heros is one the most important pest insect in soybean fields in Brazil. Therefore, site-specific management applied for controlling E. heros can result in economic and environmental benefits. However, sampling protocols for assessing spatialtemporal variability of this soybean pest and, then, for guiding a more sustainable pest manageme...
Chapter
Full-text available
Os conceitos sobre agricultura de precisão (AP) foram muitos desde do seu início em 1929, porém o ponto central entre eles, refere-se a evolução na forma de fazer, gestir e pensar a agricultura. Com a AP, houve uma geração de novos paradigmas, em que antigos conceitos puderam ser aprimorados e/ou extinguidos, novas idéias foram sendo lapidadas com...
Article
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O objetivo deste estudo foi avaliar a relação existente entre variáveis biométricas quantificadas ao longo do desenvolvimento fenológico da cultura do trigo com o rendimento de grãos e componentes produtivos. O estudo foi realizado em uma área de 4,7 ha. Inicialmente a área foi georreferenciada e dividida em uma malha amostral de 50 x 50 m, resulta...
Article
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In sub-tropical Brazil, the wheat (Triticum aestivum L.) crop requires identification of pending constraints as premise for grain yield (GY) increases. In this light, spatial variation of soil properties and their relationship with GY were investigated in a case study, where the delineation of homogeneous zones could lead to site-specific managemen...
Article
Full-text available
The objective of this work was to evaluate the performance of insecticides authorized on an emergency basis to control of Helicoverpa armigera (Lepidoptera: Noctuidae) in soybean. Seven insecticides were sprayed on the field and, 24 hours after that, soybean pointer leaves were collected and offered to 2nd instar larvae in the laboratory. Fourth in...
Article
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During the application of pesticides on soybean fields, a vertical deposition gradient of the product can occur throughout the canopy, resulting in difficulties for controlling stink bugs that are in the middle and lower thirds of plants. This study aimed at evaluating the systemicity of thiamethoxam insecticide in different soybean phenological st...
Article
A produção de mudas de qualidade, aliada a um baixo custo, é fundamental para o sucesso dos projetos florestais. Neste sentido, a escolha correta da fonte de fertilizante e do tipo de recipiente é essencial. Diante disso, objetivou-se com esse estudo avaliar a qualidade de mudas de Cedro-rosa em função do uso de fertilizantes e recipientes com dife...
Article
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A adubação nitrogenada na cultura do feijoeiro é essencial para a obtenção de elevada produtividade, sendo que a utilização de sensores de clorofila pode auxiliar nas tomadas de decisões, com relação ao manejo do nitrogênio (N). Nesse sentido, objetivou-se com este estudo avaliar a produtividade de grãos e componentes de rendimento do feijoeiro com...
Article
The creation of cattle in the semi extensive system has currently been the most used by the farmers on Brazil, however, problems such as degradation of pastures are committing this production system, reducing the production of forager and consequently the profitability of producers. In this sense, the aim of this study was to perform the mapping of...
Article
Full-text available
A fonte de fertilizante e o tipo de recipiente utilizado na produção de mudas em um viveiro estão diretamente relacionados com o custo e a qualidade das mudas. Neste sentido, o objetivo deste estudo foi avaliar a produção de mudas de cedro em função do tamanho de recipientes e fontes de adubação. O delineamento experimental utilizado foi o de bloco...
Article
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A aplicação localizada de nitrogênio, baseada no índice relativo de clorofila das folhas, pode proporcionar inúmeros benefícios econômicos e ambientais, no entanto, o conhecimento sobre a metodologia de amostragem ainda é incipiente. Nesse sentido, este estudo objetivou avaliar o uso de diferentes malhas amostrais na caracterização da variabilidade...
Article
Full-text available
Site-specific nitrogen application, based on relative chlorophyll index from leaves, may provide many economic and environmental benefits, however, the knowledge on sampling methodologies is still incipient. Thus, this study aimed to evaluate the use of different sampling grids to characterize the spatial variability of relative chlorophyll index o...
Article
Full-text available
The objective of this study was to perform the mapping of productivity and physico-chemical quality of fruit in an orchard of ‘Valencia’ orange, as well as evaluating the correlation between their valuables, aimed at precision agriculture. The study was conducted in a commercial orchard of 0.82 ha. The collections made on a sampling grid of 18 x 21...
Article
Full-text available
O objetivo do trabalho foi estudar a eficiência das malhas amostrais, utilizadas nas áreas manejadas com agricultura de precisão, para a caracterização da variabilidade espacial dos teores de fósforo (P) e potássio (K). O estudo foi conduzido em 30 áreas agrícolas, localizadas no Rio Grande do Sul, cujos solos foram classificados como Latossolos Ve...
Article
Full-text available
The objective of the research was to evaluate the efficiency of the sampling grids, used in areas managed with precision agriculture, for the characterization of spatial variability levels of phosphorus (P) and potassium (K). The study was conducted in 30 agricultural areas, located in Rio Grande do Sul state, presenting soils classified as Oxisols...
Article
O objetivo do presente trabalho foi definir a melhor dose de Osmocote® para a produção de mudas de Apuleia leiocarpa para 60 e 90 dias de permanência no viveiro após o transplantio e acompanhar a resposta do índice de clorofila das mudas durante o período em estudo. O delineamento experimental utilizado foi o inteiramente casualizado, sendo constit...

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