|
|
|
| Registros recuperados: 37 | |
|
| |
|
|
| Grego,Célia Regina; Vieira,Sidney Rosa; Xavier,Mauro Alexandre. |
| Tests to evaluate competition between plants, in general do not consider the soil spatial variability, nevertheless, the uniformity rarely is present and can not be assumed without verification. The aim of this work was to apply geostatistics to verify the spatial variability of the soil in an experimental field near Ribeirão Preto, SP, with sugarcane variety IACSP93-3046. Ninety seven geo-referenced samples, placed at distances of 10 m, were collected for soil chemical analysis, soil resistance to penetration and biometric evaluation of the sugar cane plant included number of tillers, stalk diameter, stalk height, estimated productivity (TSSe) and root density. Geostatistics has been applied by means of semivariogram, data interpolation via kriging and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Soil chemistry; Soil resistance to penetration; Root; Tillers. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500012 |
| |
|
|
| 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 |
| |
|
|
| Pivetta,Laércio Augusto; Castoldi,Gustavo; Pivetta,Laerte Gustavo; Maia,Suelen Cristina Mendonça; Rosolem,Ciro Antonio. |
| ABSTRACT Since there is no consensus on phosphogypsum (PG) rates to be used in agriculture, a better understanding of its effects on the soil solution is needed. Cotton root growth was evaluated as related to Al and Ca activity in soil solution affected by PG. The experiment was carried out in rhizotrons filled with30∙dm–3 of soil. PG rates were estimated by multiplying the soil clay content by 0.0, 1.5, 3.0, 6.0 and 12.0, and it was mixed to the sub-soil.In the upper soil layer, limestone was applied. After 90 days, samples were taken for analysis, and cotton was planted. After27 days, plants were harvested. PG increased soil pH and decreased Al content and activity. Without PG, dissolved organic carbon concentration was high in the soil solution, which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aluminum; Dissolved organic carbon; Soil chemistry. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000200264 |
| |
|
|
| Tamanini,Cristina Rincon; Motta,Antônio Carlos Vargas; Andreoli,Cleverson Vitório; Doetzer,Benno Henrique. |
| In this work, investigations were carried out with five treatments [control, three doses of lime stabilized sludge (60, 120, 240 Mg ha-1 dry base) and soil corrective plus mineral fertilizer] to evaluate the immediate recuperation of a borrowed area. The application of stabilized alkaline sewage sludge acted as an acidity corrective, allowed the increase in the organic matter contents (21 to 43.5g dm-3) and available P (44 to 156 mg dm-3). Even with the use of the highest dose, no increase in the concentration of 32 analyzed metals was observed, due to the low concentration of metals in the sludge. The experiment showed that short term restoration of degraded area was possible by using high rates of sewage sludge without metal contamination. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sewage sludge; Land reclamation; Soil fertility; Soil chemistry; Degraded area. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000400023 |
| |
|
|
| Beretta-Blanco,Andrés; Carrasco-Letelier,Leonidas. |
| Soil erosion by rainfall is a process that demands management, both for the prevention of excessive soil erosion and for the protection of the quality of freshwater bodies. Erosion coefficients (K-factors) of the universal soil loss equation (USLE)/revised USLE (RUSLE) model were assigned to 99 mapped Uruguayan soil types at 1:1,000,000 scale. This work developed a linear mixed model (LMM) with 79 soils with assigned K-factors, in which the following variables were considered: soil taxonomy, chemical composition, and parent material. The developed LMM had an R²=0.86, in which the soil taxonomy (p<0.0001), parent material (p=0.0174), clay (p=0.0005) and sand (p=0.017) contents had significant statistical effects. The prediction capacity of this model was... |
| Tipo: Journal article |
Palavras-chave: Soil classification; Parent material; Soil texture; Soil chemistry. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202017000100011 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| SILVA, L. M. da; RODRIGUES, M. de J. M.; TAVARES, O. C. H.; SANTOS, O. A. Q. dos; WADT, P. G. S.; PEREIRA, M. G.. |
| Os teores de carbono orgânico total (COT) no solo podem ser determinados por técnicas que se baseiam tanto na combustão por via úmida quanto por via seca. No entanto, a primeira apresenta-se como uma técnica demorada, porém, largamente utilizado nos laboratórios brasileiros para análise de solos. O objetivo da presente pesquisa é analisar os teores de carbono orgânico de solos do Acre submetidos à diferentes procedimentos analíticos. As amostras foram submetidas a diferentes condições de tratamento sendo aquecidas e não aquecidas, maceradas e não maceradas, bem como variar a concentração do titulante, sendo empregadas seis diferentes formas de determinação do carbono. Verificou-se que todos os métodos empregados apresentaram alta e significativa correlação... |
| Tipo: Folhetos |
Palavras-chave: Carbono orgânico; Métodos analíticos; Formação Solimões; Acre; Amazônia Ocidental; Western Amazon; Química do Solo; Matéria Orgânica; Soil organic carbon; Soil chemistry; Soil organic matter; Analytical methods. |
| Ano: 2021 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1136679 |
| |
|
| |
|
|
| MARCHI, G.; SILVA, C. A.; GUILHERME, L. R. G.; PIRES, A. M. M.; GUERREIRO, M. C.. |
| ABSTRACT: This work presents theory and applications in capillary electrophoresis. This technique is a powerful tool representing a large saving in chemicals (0.5 to 4 nL s-1 flux), samples (1 to 100 nL), and method development time. In addition, this work pictures applications such as separation and determination of analytical compounds. Recent reviews were cited to provide essential information for users regarding data sources, pioneer works, and theoretical treatments. The technique is reliable to study air, soil, and water samples in order to be able to determine trace amounts of pollutants. Examples of trace elements, pesticides, and humic substances analyses were showed. Separation and determination of proteins, peptides, aminoacids, nucleic acids,... |
| Tipo: Livros |
Palavras-chave: Análise Química; Pesticida; Química do Solo; Chemical composition; Pesticides; Soil chemistry. |
| Ano: 2007 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/571969 |
| |
|
| |
|
| |
| Registros recuperados: 37 | |
|
|
|
