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| Damian,Júnior Melo; Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Fonseca,Alencar Zachi da; Fornari,Ezequiel Zibetti; Santi,Antônio Luis. |
| ABSTRACT: The utilization of Normalized Difference Vegetation Index (NDVI) data obtained through satellite images can technically improve the process of delimiting management zones (MZ) for annual crops, resulting in socio-economic and environmental benefits. The aim of this study was to compare delimited MZ, using crop productivity data, with delimited MZ using the NDVI obtained from satellite images in areas under a no-tillage system. The study was carried out in three areas located in the state of Rio Grande do Sul, Brazil. Three crop productivity maps, from 2009 to 2015, were used for each area, whereby the NDVI was calculated for each crop productivity map using images from the Landsat series of satellites. Descriptive and geostatistical analysis were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fuzzy c-means clustering; Productivity data; Aerial images; Vegetation index. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100101 |
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| Kuss,Cassiano Carlos; Roggia,Rejane Cristina Roppa Kuss; Basso,Claudir José; Oliveira,Maria Cristina Neves de; Pias,Osmar Henrique de Castro; Roggia,Samuel. |
| Resumo: O objetivo deste trabalho foi avaliar o desempenho de inseticidas autorizados emergencialmente para o controle de Helicoverpa armigera (Lepidoptera: Noctuidae) em soja. Sete inseticidas foram pulverizados em campo e, após 24 horas, folhas do ponteiro foram coletadas e oferecidas para lagartas de 2o instar em laboratório. Lagartas do 4o instar receberam a última folha trifoliolada que se encontrava completamente expandida no momento da pulverização. Outro grupo foi exposto a folhas coletadas a partir de 72 horas da pulverização. Em campo, seis inseticidas foram pulverizados e, em seguida, as plantas foram infestadas com lagartas de 2o e 3o instar. No primeiro estudo, flubendiamida, clorantraniliprole, clorfenapir, indoxacarbe e metoxifenozida... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Ameaça fitossanitária; Heliothinae; Manejo integrado de pragas; Praga invasora; Tempo letal.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2016000500527 |
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| Tiecher,Tales; Pias,Osmar Henrique de Castro; Bayer,Cimélio; Martins,Amanda Posselt; Denardin,Luiz Gustavo de Oliveira; Anghinoni,Ibanor. |
| 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 incipient and mainly for soils under no-till (NT) systems. Avaiable studies span a wide range of responses, from a substantial increase to a slight reduction in crop yield. Also, the specific conditions leading to a favorable effect of gypsum application on crop yield are yet to be accurately identified. The primary objectives of this study were to examine previously reported results to assess the likelihood of a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phosphogypsum; Aluminum saturation; Subsurface acidity; Base saturation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100505 |
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| Pias,Osmar Henrique de Castro; Tiecher,Tales; Cherubin,Maurício Roberto; Mazurana,Michael; Bayer,Cimélio. |
| ABSTRACT 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 fertilizer recommendations. In addition, the emergence of modern high-yield-potential genotypes, the successive application of concentrated low-sulfur fertilizers, and reduction in S atmospheric deposition have raised the likelihood of positive responses of crops to S fertilization. Available literature reports contrasting crop responses to S fertilization in Brazilian soils, ranging from substantial gains to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sulfur fertilizer rate; Available SO42--S content; Climate zone; Plant nutrition; Sustainable fertilizer management. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100506 |
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| Cherubin,Maurício Roberto; Santi,Antônio Luis; Eitelwein,Mateus Tonini; Menegol,Diego Ricardo; Ros,Clóvis Orlando Da; Pias,Osmar Henrique de Castro; Berghetti,Juliano. |
| 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 Vermelhos. As dimensões das malhas amostrais estudadas foram: 100x100m (10 áreas), 142x142m (10 áreas) e 173x173m (10 áreas). Foram analisados os teores de P e K na profundidade de 0,00-0,10m. Os dados foram submetidos à análise estatística descritiva e a análise geoestatística. De modo geral, as áreas estudadas apresentaram teores médios de P e K adequados ao desenvolvimento das culturas. Entretanto, observaram-se... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultura de precisão; Amostragem de solo; Fertilidade do solo; Geoestatística; Latossolos. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000300007 |
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| Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Berghetti,Juliano; Kuss,Cassiano Carlos; Santi,Antônio Luis; Basso,Claudir José. |
| ABSTRACT 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 management, were still unknown. Thus, the objective of this study was to compare the efficiency of sampling grid sizes for monitoring the spatial variability of E. heros infestation along the soybean reproductive stages. Nine sampling campaigns were carried out using the beating sheet method, from R2 to R7 soybean phenological stages. It was used a sampling grid of 10 × 10 m, totaling 338 points in an soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical brown stink bug; Pest sampling protocol; Spatio-temporal variability; Precision agriculture. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000300386 |
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