|
|
|
| Registros recuperados: 46 | |
|
| |
|
|
| Schlindwein,Jairo André; Miotti,Alan Antonio; Fioreli-Perira,Elaine Cosma; Pequeno,Petrus Luiz de Luna; Bortolon,Leandro; Marcolan,Alaerto Luiz. |
| Soil clay content is an important soil attribute and has been used to classification of phosphorus status in the soil in order to determinate the needing of phosphorus amounts to be applied to crops production. The aim of this research was to adjust the method for soil clay content determination, adopted by the laboratories of Southern Brazil (ROLAS-RS/SC), for soil clay content evaluation in Rondônia soils. The study was conducted using 50 soil samples from Rondônia State with wide range clay content. It was tested shaking periods (1.5, 2.0 and 2.5h) associated with periods for soil particles decantation (1.5 and 2.0h) to correlate with the standard method for soil texture testing, known as the pipette method. Clay content determined through this method... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clay determination; Clay decantation; Shaking period; Soil texture; Soil physics. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011001200010 |
| |
|
|
| Silva,Jéssica C. N.; Silva,Arystides R.; Veloso,Carlos A. C.; Dantas,Edilândia F.; Sacramento,José A. A. S. do. |
| ABSTRACT Sustainable agricultural production systems can improve physical attributes of soil as well as increase carbon and nitrogen stocks in soils. The objective of this study was to evaluate changes in the stability of soil aggregates and contents and stocks of carbon and nitrogen after the conversion of native forest to crop-livestock-forest integration systems in the region of Western Pará. Soil samples from five management systems (including a control) were collected at three depths in a randomized block design, with five replications. The stability of the aggregates, soil density, particle density, and total soil porosity, as well as total carbon and nitrogen and their respective stocks were evaluated. The native forest had the highest percentages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic carbon; Soil physics; Sustainability; Brazilian Amazon. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200837 |
| |
|
| |
|
|
| PEQUENO, P. L. de L.; LEONIDAS, F. das C.; MENDES, A. M.; VIEIRA, A. H.; MARTINS, E. P.; VASCONCELOS, L. P. de. |
| O recurso natural solo pode ser definido como um corpo natural, sintetizado em forma de perfil, composto de uma mistura variável de minerais, divididos em pedaços e desintegrados e de matéria orgânica em decomposição, que cobre a terra em uma camada fina e que fornece, quando contém, as quantidades necessárias de ar e de água, amparo mecânico e em parte, subsistência para os vegetais. De uma maneira geral, os solos minerais apresentam quatro componentes principais: substâncias minerais (45%), matéria orgânica (5%), água (25%) e ar (25%). Encontrado-se, sobretudo, num estado realmente adiantado de subdivisão e intimamente misturados. Dentre as propriedades físicas do solo, a textura e a estrutura são de grande importância. A textura diz respeito ao tamanho... |
| Tipo: Folhetos |
Palavras-chave: Água; Física do Solo; Umidade do Solo; Soil physics; Soil water. |
| Ano: 2002 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/703805 |
| |
|
| |
|
| |
|
|
| Medeiros,João Carlos; Cooper,Miguel; Dalla Rosa,Jaqueline; Grimaldi,Michel; Coquet,Yves. |
| Knowledge of the soil water retention curve (SWRC) is essential for understanding and modeling hydraulic processes in the soil. However, direct determination of the SWRC is time consuming and costly. In addition, it requires a large number of samples, due to the high spatial and temporal variability of soil hydraulic properties. An alternative is the use of models, called pedotransfer functions (PTFs), which estimate the SWRC from easy-to-measure properties. The aim of this paper was to test the accuracy of 16 point or parametric PTFs reported in the literature on different soils from the south and southeast of the State of Pará, Brazil. The PTFs tested were proposed by Pidgeon (1972), Lal (1979), Aina & Periaswamy (1985), Arruda et al. (1987),... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Parametric PTFs; Point PTFs; Soil physics; Soil water. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000300005 |
| |
|
|
| Mascarenhas, Adriano Reis Prazeres; Volpato Sccoti, Marta Silvana; Melo, Rafael Rodolfo; Corrêa, Fernando Luíz de Oliveira; de Souza, Emanuel Fernando Maia; Andrade, Reginaldo Almeida; Bergamin, Anderson Cristian; Müller, Manfred Willy. |
| Objetivou-se estudar o comportamento dos atributos físicos e dos teores e estoques de carbono do solo em sistema agroflorestal multiestratificado (SAF), comparativamente a diferentes modalidades de uso solo, sendo elas o cultivo de cacaueiro sob manejo agroecológico (CAC), pastagem cultivada (PAS) e floresta nativa (FLN). A área de estudo localiza-se na estação experimental da CEPLAC em Ouro do Preto do Oeste, RO. Nos quatro tratamentos foram instaladas, ao acaso, cinco parcelas de 20 m x 30 m. Nessas parcelas, foram coletadas amostras de solo indeformadas e deformadas nas profundidades de 0 a 20 cm e 20 a 40 cm, para determinação dos atributos fiscos e estoque de carbono no solo. Os valores de densidade do solo no SAF, CAC e PAS apresentaram-se elevados e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos Florestais Qualidade Ambiental Agroecossistema; Física do solo; Sustentabilidade Agroecosystems; Soil physics; Sustainability. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1295 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Martins,Paula Cristina Caruana; Dias Junior,Moacir de Souza; Andrade,Maria Luiza de Carvalho; Guimarães,Paulo Tácito Gontijo. |
| The main source of soil structure degradation in coffee plantation is the machinery traffic because these operations may cause soil compaction affecting the crop development. This study aimed to generate the load-bearing capacity models for a Red-Yellow Latosol and to determine through the use of these models the soil susceptibility to compaction of the coffee plantation due to the implantation time and the compaction caused by the machinery traffic on the traffic lines located at the top and bottom of the ground. This study was carried out in the EPAMIG Experimental Farm, located at Três Pontas, MG, in coffee plantations (Coffee arabica L.) with 2, 7, 18 and 33 years of establishment. To obtain the load-bearing capacity models, 12 undisturbed soil samples... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Precompression stress; Structure degradation; Soil physics. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000400002 |
| |
|
| |
|
|
| Lousada,L.L.; Freitas,S.P.; Marciano,C.R.; Esteves,B.S.; Muniz,R.A.; Siqueira,D.P.. |
| Soil properties can influence weed community composition and weed density agricultural area. Knowing this relationship would allow to choose the best strategy for the control of such plants. This study aimed to investigate the correlation between weed density and chemical and physical attributes of soil in three areas (UCO, USC, and UPA) for commercial sugarcane cultivation in Campos dos Goytacazes, RJ. Grids of 40 m x 40 m were established in the areas, and soil samples were collected at the intersection points for physical and chemical analysis and evaluation of the soil seed bank (SSB), followed by a phyto-sociological survey of the weeds present. Samples were collected during two periods: February/March and June/July, 2010. SSB presented the greatest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil physics; Soil chemistry; Seed bank; Phyto-sociological survey. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582013000400002 |
| |
|
| |
|
| |
| Registros recuperados: 46 | |
|
|
|
