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| Registros recuperados: 11 | |
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| Leite,Daniel Mariano; Vieira,Luciano Baião; Fernandes,Haroldo Carlos; Carneiro,José Eustáquio Souza; Fernandes Filho,Elpídio Inácio; Santos,Nerilson Terra. |
| Bean yield in Brazil is considered low, around 820 kg ha-1, reaching values above 3000 kg ha-1, there are several environmental factors which may limit the performance of this culture, especially those related to the soil. The present work aimed to evaluate soil compactions in bean culture of different soil management systems, by means of digital images. This study took place at the Federal University of Viçosa, randomized block design with six replications was used and four treatments, (direct planting, conventional preparation, minimum plantation using grade crusher-leveler and minimum plantation using scarificator), were evaluated. The spectral responses using the vegetation indexes (NDVI, RS, GNDVI, VARI, WDRVI and SAVI) were evaluated, calculated from... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Remote sensing; Soil management; Unmanned balloon. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000200011 |
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| Antônio,Adilson de Castro; Silva,Derly José Henriques da; Picanço,Marcelo Coutinho; Santos,Nerilson Terra; Fernandes,Maria Elisa de Sena. |
| The objective of this work was to determine the inheritance of resistance by antixenosis in tomato plants (Lycopersicon esculentum) to tomato leafminer [Tuta absoluta (Lepidoptera: Gelechiidae)]. Evaluations were performed for tomato plants of the generations P1, P2, F1, F2, RC1 and RC2. The measured characteristic in the parents, BGH-1497 (P2 male) and 'Santa Clara' (P1 female), and in the F1, F2, RC1 and RC2 generations was the number of eggs per plant. This number was converted to the oviposition nonpreference index. The inheritance of antixenosis resistance of genotype BGH-1497 is ruled by a gene of greater effect and polygenes in epistatic interactions, with a phenotypic proportion of 13:3 between susceptible and resistant genotypes, respectively. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lycopersicon esculentum; Tuta absoluta; Genetic resources. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000100010 |
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| Modolo,Alcir José; Fernandes,Haroldo Carlos; Naime,João de Mendonça; Schaefer,Carlos Ernesto G.R.; Santos,Nerilson Terra; Silveira,João Cleber Modernel da. |
| O condicionamento físico do solo ao redor das sementes reveste-se de grande importância para o bom desenvolvimento inicial da cultura, assegurando uma população sadia de plantas. O adequado contato solo-semente é um pré-requisito para a rápida emergência e o bom estabelecimento da cultura. Neste trabalho, objetivou-se utilizar a tomografia computadorizada de resolução milimétrica para determinação do ambiente solo-semente em sistema de plantio direto, logo após o plantio da cultura da soja. Utilizou-se o esquema de parcelas subdivididas, em que as parcelas constituíram-se de três teores de água do solo, correspondentes a 0,27; 0,31; e 0,36 kg kg-1, e as subparcelas de quatro níveis de carga, aplicadas pela roda compactadora, correspondentes a 0, 50, 90 e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mecanização agrícola; Compactação do solo; Soja. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832008000200007 |
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| Abrahão,Selma Alves; Pinto,Francisco de Assis de Carvalho; Queiroz,Daniel Marçal de; Santos,Nerilson Terra; Gleriani,José Marinaldo; Alves,Enrique Anastácio. |
| Este trabalho foi realizado para determinar, entre seis índices de vegetação baseados em dados de refletância espectral, aquele que melhor discrimina doses de nitrogênio e que possui maior correlação com leituras de clorofila e massa seca do capim-tanzânia (Panicum maximum Jacq.). Os índices testados foram o NDVI (índice de vegetação por diferença normalizada, calculado utilizando a banda do vermelho e a banda do infravermelho próximo), VARI (índice resistente à atmosfera na região do visível, calculado utilizando a banda de transição do vermelho ao infravermelho e a banda do verde) e WDRVI (índice de vegetação de amplo alcance, calculado utilizando três coeficientes de ponderação, 0,05; 0,1 e 0,2). Foram avaliadas quatro doses de nitrogênio (0, 80, 160 e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leituras de clorofila; Massa seca; Panicum maximum Jacq.; Refletância espectral. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000900001 |
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| Barbosa,Danilo Pereira; Bottega,Eduardo Leonel; Valente,Domingos Sárvio Magalhães; Santos,Nerilson Terra; Guimarães,Wellington Donizete; Ferreira,Matheus de Paula. |
| ABSTRACT The proper handling soil allows the reduction of contaminants, maximize agricultural productivity, and is directly related the knowledge spatial variability of soil attributes. This spatial variability can express isotropic and anisotropic form. The latter being neglected in research related to management zones delineation. In this context, the present study aimed to evaluate the effect of the geometric anisotropy correction on the management zone delineation. The methodology was applied under database of soybean productivity and apparent electrical conductivity (CEa) of a rural property in Ponta Porã - MS. By means of this georeferenced database, maps was interpolated with ordinary kriging. For each combination, attribute (productivity and CEa)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Anisotropy factor; Spatial variability; Apparent electrical conductivity; Soybean. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000400543 |
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| Abrahão,Selma Alves; Pinto,Francisco de Assis de Carvalho; Queiroz,Daniel Marçal de; Santos,Nerilson Terra; Carneiro,José Eustáquio de Souza. |
| This study aimed to develop classifiers based on different combinations of spectral bands and vegetation indices from original, segmented and reflectance images in order to determine the levels of leaf nitrogen and chlorophyll in the bean, and to define the best time and best variables. A remote-sensing system was used, consisting of a helium balloon and two small-format digital cameras. Besides the individual spectral bands, four vegetation indices were tested: simple ratio, normalized difference, normalized difference in the green band, and modified-chlorophyll absorption. The classifiers proved to be efficient in determining levels of leaf nitrogen and chlorophyll. The best time for determining leaf N content was at 13 DAE (stage V4). The best... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precision farming; Remote sensing; Nitrogen dosage. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000300007 |
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| Silva,Samuel de Assis; Queiroz,Daniel Marçal de; Pinto,Francisco de Assis de Carvalho; Santos,Nerilson Terra. |
| Differentiating coffees through the notion of terroirs allows us to determine potential areas for specialty coffee production and to characterize the type of coffee in these areas, exploring their potential. The objective of this work was to study spatial variability quality and to characterize and delimit terroirs in coffee crop production in Araponga municipality, Minas Gerais State, Brazil, using sensorial evaluation. The data were collected from four crops, from altitudes ranging from 770 to 1270 m, with the extract increasing from low to high. In each plot of crops, samples of cherry fruits were collected, dried, benefited, subjected to sensorial analysis and given grades ranging from 0 to 100 points for the global drink quality and relative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geographical origin; Sensorial quality; Spatial variability. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100003 |
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| Reis Jr.,Roberto Anjos; Fontes,Paulo Cezar Rezende; Neves,Júlio Cesar Lima; Santos,Nerilson Terra. |
| Soil K+ to Ca2+ and Mg2+ ratio as well as the total salinity were evaluated in response to potassium fertilizer application onto potato. Potassium was applied at six different rates (0, 60, 120, 240, 480 and 960 kg ha-1 of K2O), as K2SO4, and was placed during planting time in the furrow. Soil from the 0-200 mm layer was collected in the furrow, 20 and 48 days after plant emergence (DAE) to evaluate soil pH, K+, Ca2+ and Mg2+ contents and the total electrical conductivity (EC). A factorial design (6x2), with six K rates and two sampling times was set up in a randomized block design with four replications. The application of K fertilizer increased exchangeable K, did not affect pH and exchangeable Ca and Mg contents, but caused a linear increase of the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum tuberosum; Potassium; Calcium; Magnesium; Salinity. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000400030 |
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| Registros recuperados: 11 | |
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