|
|
|
| Registros recuperados: 46 | |
|
| |
|
| |
|
|
| Carvalho,Ailton A. de; Montenegro,Abelardo A. de A.; Assis,Fred M. V. de; Tabosa,José N.; Cavalcanti,Roberta Q.; Almeida,Thayná A. B.. |
| ABSTRACT Maize crop under rainfed conditions is widely grown in the Brazilian Northeast on community farms for human and animal consumption. The application of mulch could be adopted to enhance rainwater harvesting and soil moisture levels, although such practice is rarely applied in rainfed cultivation. This study aimed to evaluate the spatial variability of maize productivity, based on soil physical attributes and plant growth and yield, under a rainfed regime in the presence and absence of mulch in the Brazilian semi-arid region. The study was conducted from May to September 2016 in Pesqueira - PE (locality of the Semiarid of Pernambuco State, Northeast, Brazil), during which the development and production of maize in experimental plots were evaluated,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rainfed agriculture; Kriging; Coconut powder; Mulching; Cultivar São José. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100033 |
| |
|
|
| Araújo,Diego C. dos S.; Montenegro,Suzana M. G. L.; Montenegro,Abelardo A. de A.; Silva Junior,Valdemir de P. e; Santos,Sylvana M. dos. |
| ABSTRACT This study aimed to evaluate the spatial patterns of physical and chemical properties of a soil in an experimental basin with an area of 149 km2, located in the municipality of Pesqueira, in the semi-arid region of Pernambuco state (Brazil). Samples were taken in the layers of 0-0.10 and 0.10-0.20 m, at 35 monitoring points distributed in an irregular grid, encompassing the three soil classes present in the basin and commonly found in the semi-arid region. For the attributes of soil texture, organic carbon and bulk density in the layer of 0.10-0.20 m, spatial dependence from medium to strong was detected, ranging from 0.03 to 49.98%. Bulk density in the layer 0-0.10 m, as well as the electrical conductivity, in both layers, showed pure nugget... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kriging; Geostatistics; Caatinga. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000100038 |
| |
|
|
| BRITO,RAIMUNDO DIONÍZIO PINTO; FARIAS,PAULO ROBERTO DA SILVA; RODRIGUES,NARA ELISA LOBATO; OLIVEIRA,FABIO JÚNIOR DE; TEXEIRA,RENATO ALVES. |
| ABSTRACT The production of biofuels from native Amazonian palm trees, belonging to the family of Arecaceae, like Attalea maripa (Aubl) Mart. (Maripa palm), are objects of studies of alternative energy sources for the biofuels production. Thus, the aim of this research was to evaluate the spatial dynamics of agronomic variables of Maripa palm crop production associated with the characteristics of the sampling sites in a spontaneous growth area in the Low Tocantins region. 100 palms of A. maripa were selected, of spontaneous growth and in production phase, on a 10 ha area in the municipality of Cametá / PA, in which the morpho-agronomical variables were collected (MIN, FIN, ABN, LN, DBH, AWAB and AFW), from January 2014 to June 2014. The semivariograms were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spatial dependence; Maripa palm; Kriging; Semivariogram; Variables morphoagronomics. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452017000300903 |
| |
|
| |
|
|
| Carvalho,Thayla Morandi Ridolfi de; Moura,Daniella Jorge de; Souza,Zigomar Menezes de; Souza,Gustavo Soares de; Bueno,Leda Gobbo de Freitas; Lima,Karla Andrea Oliveira de. |
| The objective of this research was to evaluate different minimum ventilation systems, in relation to air quality and thermal comfort using geostatistics in brooding phase. The minimum ventilation systems were: Blue House I: exhaust fans + curtain management (end of the building); Blue House II: exhaust fans + side curtain management; and Dark House: exhaust fans + flag. The climate variables evaluated were: dry bulb temperature, relative humidity, air velocity, carbon dioxide and ammonia concentration, during winter time, at 9 a.m., in 80 equidistant points in brooding area. Data were evaluated by geostatistic technique. The results indicate that Wider broiler houses (above 15.0 m width) present the greatest ammonia and humidity concentration. Blue House... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air quality; Environment; Kriging; Poultry; Welfare. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000100028 |
| |
|
| |
|
|
| Nicolella,Gilberto; Perez Filho,Archimedes; Souza,Manoel Dornelas de; Ferracini,Vera Lúcia. |
| The use of simulation models is probably the most efficient means for predicting the behavior of pesticides in the soil-plant-water system. The CMLS (Chemical Movement in Layered Soils) simulation model for predicting the fate of pesticides was used for studying the behavior of tebuthiuron, a herbicide used in sugar cane crops, from a sampling grid with 111 sampling points 200 m apart from one another and encompassing three types of soil: Ustic Quartzipsamment, Rhodic Hapludox and Typic Hapludox, all with medium and clay textures. The 373 points assessed by the simulator, generated from samples coming from the original grid and through the geostatistical methods of variography and ordinary kriging, returned the depth values reached by the herbicide after... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microbasin; Sugar cane; Tebuthiuron; Variography; Kriging. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000100010 |
| |
|
|
| Souza,Zigomar Menezes de; Marques Júnior,José; Pereira,Gener Tadeu; Barbieri,Diogo Mazza. |
| Soils with small variations in relief and under the same management system present differentiated spatial variabilities of their attributes. This variability is a function of soil position in the landscape, even if the relief has little expression. The aim of this work was to investigate the effects of relief shape and depth on spatial variability of soil chemical attributes in a Typic Hapludox cultivated with sugar cane at two landscape compartments. Soil samples were collected in the intercrossing points of a grid, in the traffic line, at 0-0.2 m and 0.6-0.8 m depths, comprising a set of 100 georeferenced points. The spatial variabilities of pH, P, K, Ca, Mg, cation exchange capacity and base saturation were quantified. Small relief shape variations lead... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geostatistics; Kriging; Relief; Sugar cane. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200008 |
| |
|
| |
|
|
| Nanni,Marcos Rafael; Povh,Fabrício Pinheiro; Demattê,José Alexandre Melo; Oliveira,Roney Berti de; Chicati,Marcelo Luiz; Cezar,Everson. |
| The importance of understanding spatial variability of soils is connected to crop management planning. This understanding makes it possible to treat soil not as a uniform, but a variable entity, and it enables site-specific management to increase production efficiency, which is the target of precision agriculture. Questions remain as the optimum soil sampling interval needed to make site-specific fertilizer recommendations in Brazil. The objectives of this study were: i) to evaluate the spatial variability of the main attributes that influence fertilization recommendations, using georeferenced soil samples arranged in grid patterns of different resolutions; ii) to compare the spatial maps generated with those obtained with the standard sampling of 1 sample... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil attributes; Grid sampling; Kriging; Cross-validation; Kappa statistic. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000300017 |
| |
|
|
| Camargo García,Juan Carlos; Arias Morales,Jennifer Paola; Muñoz Paredes,Dein. |
| En la vereda Miraflores, municipio de Quinchía, Risaralda, donde se ha realizado minería aurífera de forma artesanal durante más de tres décadas, se evaluó el contenido de mercurio (Hg) en suelos y lechos de quebradas. Para el efecto se realizó un muestreo sistemático considerando montajes de minería activa, inactiva y áreas sin intervenir. Igualmente se hicieron observaciones en las partes altas, medias y bajas en lechos de quebradas naturales y drenajes formados artificialmente por el desvío de cauces. Los promedios de los valores de Hg (7.1 mg/kg) fueron más altos en aquellos lugares aledaños a los montajes y cuando la precipitación aumentó. Aunque en Colombia existe poca información y normatividad relacionada con la contaminación de suelos, los valores... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Contaminación de suelos; Degradación de suelos; Minería; Kriging. |
| Ano: 2015 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122015000200008 |
| |
|
|
| Souza, Gustavo Soares; UFES; Lima, Julião Soares de Souza; UFES; Silva, Samuel de Assis; UFES; Oliveira, Rone Batista de; UNESP. |
| Estudos mostram a importância de se conhecer a variabilidade dos atributos do solo para o manejo mais eficiente. O objetivo deste trabalho foi analisar a variabilidade espacial dos atributos químicos de um Argissolo Vermelho-Amarelo, cultivado com pastagem de Brachiaria decumbens, em Alegre – Espírito Santo. Amostras de solo foram coletadas na profundidade de 0-0,2 m, nos pontos de cruzamento de uma malha com intervalos regulares de 10 m, perfazendo o total de 64 pontos. Os dados foram submetidos à analise estatística descritiva, geoestatística e interpolação por krigagem ordinária. Os valores dos coeficientes de variação apresentaram-se baixos para pH, altos para Al e m% e médios para os demais atributos. Os atributos pH, P, H+Al e m% apresentaram forte... |
|
Palavras-chave: 5.01.00.00-9 Agronomia dependência espacial; Geoestatística krigagem. spatial dependence; Geostatistics; Kriging. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5322 |
| |
|
| |
|
|
| Morales,Luis Alberto; Paz-Ferreiro,Jorge; Vieira,Sidney Rosa; Vázquez,Eva Vidal. |
| The aim of this study was to describe the effect of lime additions on the spatial variability of pH and Eh in a typic Plintacualf cultivated with rice, in Corrientes, Argentina. The 5.1 ha field was divided in three sub plots at which dolomitic lime additions were made at the rates zero, 625 kg ha-1 and 1250 kg ha-1. The soil was sampled at three stages: before sowing thus in aerobic conditions, and then two more times in anaerobiosis. Ninety-six samples per sub plot were taken on each of the three sampling stages on a grid of 11.9 x 20 m. Soil pH and Eh were measured by routine methods. The pH values increased, whereas Eh values decreased, following flooding. The coefficients of variation for pH was rather low during all the three studied periods.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Semivariogram; Flooded field; Liming; Kriging. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500008 |
| |
|
|
| Neves,Débora Andréia; Lemos,Fábio; González,Antonio Paz; Vieira,Sidney Rosa; Siqueira,Glécio Machado. |
| Protecting natural mosaics as forest reserves poses a challenge, because if they hold significant high levels of biodiversity, they may function as key seed sources for regenerating ecosystems and adjacent reforested areas. Currently, there is lack of information about the spatial organization of native species in core forest fragments remaining between reforested fields. Biodiversity as measured by species and number of individuals was assessed in two forest reserve zones located within reforestations of Eucalyptus sp and Pinus sp in Agudos, São Paulo, Brazil. The main objective was to compare the state of biodiversity within two natural areas with contrasting disturbance levels; a second objective was to investigate recognisable patterns of species and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Nugget effect; Kriging; Semiovariograms. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500014 |
| |
|
| |
|
| |
|
|
| Machado,Roriz Luciano; Ceddia,Marcos Bacis; Carvalho,Daniel Fonseca de; Cruz,Eleandro Silva da; Francelino,Marcio Rocha. |
| Knowledge of maximum daily rain and its return period in a region is an important tool to soil conservation, hydraulic engineering and preservation of road projects. The objective of this work was to evaluate the spatial variability of maximum annual daily rain considering different return periods, at the Rio de Janeiro State. The data set was composed by historical series of 119 rain gauges, for 36 years of observation. The return periods, estimated by Gumbel distribution, were 2, 5, 10, 25, 50 and 100 years. The spatial variability of the return periods was evaluated by semivariograms. All the return periods presented spatial dependence, with exponential and spherical model fitted to the experimental semivariograms. The parameters of the fitted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Runoff; Extreme rainfall; Geostatistics; Kriging. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052010000500009 |
| |
| Registros recuperados: 46 | |
|
|
|
