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| Registros recuperados: 174 | |
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| Souza, Edicarlos Damacena de; UFG; Carneiro, Marco Aurélio Carbone; UFG; Banys, Vera Lúcia; UFG. |
| Espécies vegetais com alta produção de fitomassa são de fundamental importância para o desenvolvimento sustentável do plantio direto no cerrado. Objetivou-se avaliar a produção de fitomassa e o acúmulo de nitrogênio em 17 espécies vegetais em um Latossolo Vermelho distroférrico da região do Cerrado. O trabalho foi realizado no campo experimental da Universidade Federal de Goiás, localizado no Centro de Ciências Agrárias e Biológicas no Campus de Jataí – Estado de Goiás. O delineamento experimental adotado foi o de blocos ao acaso, com cinco repetições. Foram utilizadas as espécies: Aveia preta comum, Aveia preta IAPAR61, Braquiaria brizantha, Braquiaria decumbens, Capim-pé-de-galinha, Milheto BN2, Milheto BRS 1501, Milheto MT, Crotalaria spectabilis,... |
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Palavras-chave: 5.01.00.00-9 Agronomia conservação do solo; Manejo do solo; Plantio direto; Leguminosa; Gramíneas. soil conservation; Soil management; No-tillage; Legume; Grass species. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5313 |
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| Gonçalves, José Ricardo Pupo; EMBRAPA; Moreira, Adônis; EMBRAPA/CPPSE; Bull, Leonardo Theodoro; UNESP; Crusciol, Carlos Alexandre Costa; UNESP; Boas, Roberto Lyra Villas; UNESP. |
| A utilização de calcário em plantio direto é um dos problemas na adoção desse método de manejo do solo. O trabalho teve por objetivo avaliar as alterações nas propriedades químicas do solo cultivado nos sistemas de plantio convencional (SCC) e plantio direto (SPD), em função da granulometria e de doses de calcário dolomítico aplicado em superfície. Os experimentos foram realizados por três anos agrícolas em Latossolo Vermelho distrófico, em área de pastagem de Urochloa decumbens, com cultivo de milho em sucessão com aveia preta e triticale. O delineamento experimental utilizado foi os blocos casualizados em parcelas sub-subdivididas, com quatro repetições. Foram realizadas análises químicas (pH, Ca, Mg, H+Al e saturação por bases) do solo coletado nas... |
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Palavras-chave: 5.01.01.00-5 acidez do solo; PH; Calagem; Saturação por bases; Manejo do solo 5.01.01.05-6 soil acidity; PH; Liming; Base saturation; Soil management. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3659 |
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| Silva Neto, Eduardo Carvalho da; Pereira, Marcos Gervasio; Frade Júnior, Elizio Ferreira; Silva, Sandra Bezerra da; Carvalho Júnior, João Andrade; Santos, José Carlos dos. |
| In Amazonia, the main causes of deforestation are systems based on slash-and-burn agriculture. The objective of this work was to evaluate temporal changes in the soil chemical attributes after the vegetation has been slashed and burned in an area of native forest in the Western Amazon. For this study, four hectares of forest in Cruzeiro do Sul, State of Acre, Brazil, was slashed and burned. The soil in the study area was classified as Ultisol (Argissolo Amarelo Distrófico típico). Soil samples were collected over the course of one year, the first one being collected 16 hours after the burn and the others at 30, 60, 90, 150, 210, 270, and 360 days after the burn. The soil surface layers were more sensitive to fire action. Ashes from vegetation burn... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Amazonian agroecosystem; Soil fertility; Cycling of nutrients; Soil management; Brasil.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42609 |
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| Assunção,Shirlei Almeida; Oliveira,Ana Paula Pessim; Anjos,Lúcia Helena Cunha dos; Pereira,Marcos Gervasio; Lima,Eduardo. |
| ABSTRACT The recent approach of eliminating the use of fire for sugarcane harvesting (green cane) resulted in managing the crop on a trash-blanketed soil, which changed the content and dynamic of carbon and the nitrogen requirement. These alterations are relevant due to economic and environmental aspects of sugarcane production systems. This study aimed to evaluate changes in total organic carbon (TOC), total nitrogen (TN) and soil organic matter fractions with the application of N-fertilizer on the residues of green cane. The experiment was with sugarcane at the fourth ratoon in Linhares, Espírito Santo State, Brazil. The soil is a Xanthic Dystrudults, originated from Barreiras Group sediments in the coastal tableland region. The treatments were set in a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil management; Saccharum officinarum; Sugarcane residues. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000200356 |
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| Dafonte,Jorge Dafonte; Guitián,Montserrat Ulloa; Paz-Ferreiro,Jorge; Siqueira,Glécio Machado; Vázquez,Eva Vidal. |
| Nutrient maps based on intensive soil sampling are useful to develop site-specific management practices. Geostatistical methods have been widely used to determine the spatial correlation and the range of spatial dependence at different sampling scales. If spatial dependence is detected, the modelled semivariograms can then be used to map the interested variable by kriging, an interpolation method that produces unbiased estimates with minimal estimation variance. The objectives of this paper were to examine and to map the spatial distribution of the micronutrients Cu, Zn, Fe and Mn on an agricultural area in Galicia, Spain, under European Atlantic climatic conditions. The ordinary kriging was first used to determine the values for the non-sampled locations,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil management; Geostatistics; Spatial variability; Soil chemistry. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500018 |
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| Trevisan,Rodrigo Gonçalves; Freddi,Onã da Silva; Wruck,Flávio Jesus; Tavanti,Renan Rimoldi; Peres,Fernanda Salles Cunha. |
| ABSTRACT The production systems of upland rice culture in Mato Grosso are not consolidated yet while the effects of soil physical properties and their correlation with rice yield in crop-livestock integrated systems are not defined as well. Therefore, this study determined the spatial variability of physical properties of soil and rice cultivated in no-tillage system under different cover crops, using principal components analysis and geostatistics. The experiment was conducted in Santa Carmen, northern Mato Grosso. A regular grid with 100 sample points distributed in an area of 26,400 m2 was installed. Soil and rice samples were collected to determine rice variables and soil physical properties. The average rice yield was 1.70 Mg∙ha−1, ranging from 0.70... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Orysa sativa; Soil management; Agricultural sustainability. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100145 |
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| Souza,Renata Carolini; Cantão,Maurício Egídio; Nogueira,Marco Antonio; Vasconcelos,Ana Tereza Ribeiro; Hungria,Mariangela. |
| ABSTRACT The soil represents the main source of novel biocatalysts and biomolecules of industrial relevance. We searched for hydrolases in silico in four shotgun metagenomes (4,079,223 sequences) obtained in a 13-year field trial carried out in southern Brazil, under the no-tillage (NT), or conventional tillage (CT) managements, with crop succession (CS, soybean/wheat), or crop rotation (CR, soybean/maize/wheat/lupine/oat). We identified 42,631 hydrolases belonging to five classes by comparing with the KEGG database, and 44,928 sequences by comparing with the NCBI-NR database. The abundance followed the order: lipases > laccases > cellulases > proteases > amylases > pectinases. Statistically significant differences were attributed to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Metagenome; Microbiome; Soil enzymes; Soil management; No-tillage. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400723 |
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| Camacho-Tamayo,Jesús H; Luengas,Carlos A; Leiva,Fabio R. |
| Growing demand for food exerts pressure on natural resources and may lead to the expansion of agricultural frontiers in developing countries. Most of this pressure appears in tropical zones, in native savannahs, with naturally infertile soils prone to degradation. Crop management in these regions is based on generalized estimates, leaving aside the inherent soil variability, leading to low production efficiency and high risk of environmental damage. This study aims at determining the spatial variability of some chemical properties, including organic carbon, pH, exchangeable acidity, exchangeable aluminum, P, Ca, Mg, K and Na for two Oxisols with different levels of agricultural intervention, in Puerto Lopez, Colombia, in order to identify guidelines for... |
| Tipo: Journal article |
Palavras-chave: Geostatistics; Kriging; Soil management; Precision agriculture; Kriging. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000100005 |
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| Drescher,Marta Sandra; Reinert,Dalvan José; Denardin,José Eloir; Gubiani,Paulo Ivonir; Faganello,Antônio; Silva,Bernardo Rodrigues da; Zardin,Maísa Carina. |
| ABSTRACT: Intensification of soil compaction process under no-tillage (NT) is motivating the search for alternatives to mitigate soil compaction state. This study evaluated changes in soil physical and hydraulic properties caused by seeder with fertilizer shanks at different depths compared with the double discs lagged seeder, to investigate the possibility of soil decompaction by sowing under NT in southern Brazil. The study was conducted in a clayed Oxisol, for 27 years under NT. Treatments were three planting mechanisms: S0.10m: cutting disc combined with shank acting to 0.10m depth; S0.15m: cutting disc combined with shank acting to 0.15m depth and, D0.07m: double discs lagged acting to 0.07m depth in an experimental randomized block design with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil management; Mechanical decompaction; Soil structure recovery. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782017000300252 |
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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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| Silva,Bruno Montoani; Santos,Walbert Junior Reis dos; Oliveira,Geraldo César de; Lima,José Maria de; Curi,Nilton; Marques,João José. |
| The knowledge of the water content in the soil profile is essential for an efficient management of crop growth and development. This work aimed to use geostatistical techniques in a spatio-temporal study of soil moisture in an Oxisol in order to provide that information for improved crop management. Data were collected in a coffee crop area at São Roque de Minas, in the upper São Francisco River basin, MG state, Brazil. The soil moisture was measured with a multi-sensor capacitance (MCP) probe at 10-, 20-, 30-, 40-, 60- and 100-cm depths between March and December, 2010. After adjusting the spherical semivariogram model using ordinary least squares, best model, the values were interpolated by kriging in order to have a continuous surface relating depth x... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water use efficiency; Soil management; Deep soil tillage; Plant-available water; Arabica coffee. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000100039 |
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| Teixeira,Anita Fernanda dos Santos; Weindorf,David C.; Silva,Sérgio Henrique Godinho; Guilherme,Luiz Roberto Guimarães; Curi,Nilton. |
| ABSTRACT Portable X-ray fluorescence (pXRF) spectrometry has been increasingly adopted for varying studies worldwide. This work aimed at characterizing effects of soil management on the content of chemical elements detected by pXRF in managed and unmanaged areas of Inceptisols, and evaluating the potential of using pXRF data to generate prediction models for soil fertility attributes, evaluating the effect of land uses on such models. Samples were collected in A, B, and C horizons of soils under native forest, native Cerrado, coffee crops with 1 and 5 years of implantation and eucalyptus. Soil fertility attributes were determined through laboratory analyses, whereas, elemental contents were obtained through pXRF analysis. PXRF data were used for modeling... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil property modeling; Soil management; Soil fertility; Brazilian Cerrado; Proximal sensor.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000500501 |
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| Registros recuperados: 174 | |
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