scholarly journals Spatial variability of Regosol chemical atributes in guava management with neem under semi-arid conditions

2016 ◽  
Vol 20 (7) ◽  
pp. 618-624 ◽  
Author(s):  
Douglas B. Castro ◽  
Elvira M. R. Pedrosa ◽  
Abelardo A. A. Montenegro ◽  
Mario M. Rolim ◽  
Diego A. H. S. Leitão ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Gaussian Model ◽  
Spherical Model ◽  
Psidium Guajava ◽  
Northeastern Brazil ◽  
Soil C ◽  
Neem Cake ◽  
Chemical Attributes ◽  
Semi Arid Region ◽  
Semi Arid

ABSTRACT Considering the relevant importance of guava (Psidium guajava) in Northeastern Brazil along with the benefits of neem cake amendments on soil characteristics, this work evaluated the effects of neem cake on chemical attributes of a Regosol under irrigated guava orchard in an alluvial valley of Pernambuco semi-arid region. Evaluations were carried out in two areas (area 1 - with neem cake; area 2 - without neem cake) at three periods: before the first application of neem cake, 90 days after the first application and 90 days after the second application. A regular 8 × 6-point grid was designed in each area and the soil was sampled for total organic carbon, pH, soluble salts (Na+, K+, Ca2+ and Mg2+) and total nitrogen contents, as well as soil C-CO2 evolution rate in soil. Geostatistical analysis pointed out the spherical model as the best fit to the studied variables, followed by the Gaussian model, with ranges from 12 to 60.5 m. Neem cake incorporation increased spatial variability and the contents of the evaluated soil chemical attributes.

scholarly journals Ethnopharmacological study of Stryphnodendron rotundifolium in two communities in the semi-arid region of northeastern Brazil

2014 ◽  
Vol 24 (2) ◽  
pp. 124-132 ◽  
Author(s):  
Dayanne Rakelly de Oliveira ◽  
Washington Soares Ferreira Júnior ◽  
Vanessa de Carvalho Nilo Bitu ◽  
Patricia Gonçalves Pinheiro ◽  
Cicero Diego Almino Menezes ◽  
...  
Keyword(s):  
Arid Region ◽  
Northeastern Brazil ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Prevalence and intensity of pentastomid infection in two species of snakes from northeastern Brazil

2007 ◽  
Vol 67 (4) ◽  
pp. 759-763 ◽  
Author(s):  
WO Almeida ◽  
A Vasconcellos ◽  
SG Lopes ◽  
EMX Freire
Keyword(s):  
Arid Region ◽  
Infection Intensity ◽  
W State ◽  
Northeastern Brazil ◽  
Infection Rates ◽  
New Host ◽  
Host Infection ◽  
Semi Arid Region ◽  
New Host Records ◽  
Semi Arid

This study aimed to evaluate the infection rates of snakes by pentastomids in the semi-arid region of Brazil. Fifteen snakes (four Micrurus ibiboboca (Merrem, 1820) and eleven Philodryas nattereri Steindachner, 1870) were collected between January and April of 2005, in the municipality of Crato (07° 14' S and 39° 24' W), State of Ceará, Brazil. Laboratorial analysis of the respiratory tracts of the sampled snakes indicated differences in host infection rates: four individuals of P. nattereri (36.4%) were infected by Cephalobaena tetrapoda Heymons, 1922 (mean infection intensity 1.5 ± 0.28, 1-2) and three specimens (27.3%) by Raillietiella furcocerca (Diesing, 1863) (2.3 ± 1.32, 1-5). Only one individual of M. ibiboboca (25%) was infected by a non-identified species of Raillietiella sp. These are the first data on pentastomid infection in snakes in Northeastern Brazil and both snake species comprise new host records for the pentastomids. The results also indicate that the generalist parasites C. tetrapoda and R. furcocerca share their definitive hosts.

scholarly journals THERMAL CHARACTERIZATION OF THE FAVELONE DERIVATIVES (CNIDOSCOLUS QUERCIFOLIUS) BY THERMOGRAVIMETRY AND DIFFERENTIAL SCANNING CALORIMETRY

2006 ◽  
Vol 05 (3) ◽  
pp. 8-20
Author(s):  
José Carlos Oliveira SANTOS ◽  
Lionete Dantas NUNES ◽  
Sylvia Berenice NÓBREGA ◽  
Dantas José Pires PUZINSKI ◽  
Antonio Gouveia SOUZA
Keyword(s):  
Differential Scanning Calorimetry ◽  
Arid Region ◽  
Agricultural Practices ◽  
Thermal Characterization ◽  
Northeastern Brazil ◽  
Scanning Calorimetry ◽  
Semi Arid Region ◽  
Derivatives Of ◽  
Semi Arid

A thermal analysis has been applied to characterization of food and food products. Taking into account the problems of desertification and agricultural practices able to provide income to the population at the semi-arid region of Northeastern Brazil, this work presents the results of the chemical, thermal and kinetic characterization by thermogravimetry and differential scanning calorimetry of the seed derivatives of favelone (cnidoscolus quercifolius), aiming at the application of these materials as an alternative of food source for animals and for the human population at this brazilian region.

Hunting, capture, and wildlife use by communities in a semi-arid region of Northeastern Brazil

2021 ◽  
pp. 1-11
Author(s):  
Anna Karolina Martins Borges ◽  
Bruna Dias Pontes Ribeiro ◽  
Rômulo Romeu Da Nóbrega Alves
Keyword(s):  
Arid Region ◽  
Northeastern Brazil ◽  
Wildlife Use ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Natural Regeneration of the Mangrove Vegetation on Abandoned Salt Ponds in Ceará, in the Semi-Arid Region of Northeastern Brazil

Diversity ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 27 ◽  
Author(s):  
Armando Reis-Neto ◽  
Antonio Meireles ◽  
Marília Cunha-Lignon
Keyword(s):  
Natural Regeneration ◽  
Arid Region ◽  
Ecosystem Dynamics ◽  
Shrimp Farming ◽  
Northeastern Brazil ◽  
Integrated Analysis ◽  
Technical Problems ◽  
Mangrove Vegetation ◽  
Semi Arid Region ◽  
Semi Arid

The development of the mangrove in Ceará state, northeastern Brazil, is limited by local environmental and climatic factors, associated with the variables that determine the region’s semi-arid climatic conditions. The same conditions also contribute to the installation of artisanal saltworks in estuarine environments. The artisanal production of salt peaked in the 20th century, but with the decline of this activity, the salt evaporation ponds were abandoned, and have been incorporated back into the natural marine-estuarine environment and colonized by mangrove forests. In the early 2000s, however, the expansion of shrimp farming operations impacted this same environment. The present study was based on a spatiotemporal analysis of the natural regeneration of the mangrove vegetation in abandoned salt pond areas in the Brazilian semi-arid region between 1968 and 2009. The integrated analysis of mangrove ecosystem dynamics and the legislation that regulates the licensing of these economic activities identified a number of technical problems in the formulation and execution of the COEMA resolution 02/2002, which permits the installation of shrimp farms in areas dominated by the mangrove. The findings of the present study reinforce the need for a careful reformulation of the Ceará state environmental legislation, in order to guarantee the maximum possible conservation of the coastal zone.

scholarly journals Spatial and multivariate analysis of soybean productivity and soil physical-chemical attributes

2019 ◽  
Vol 23 (6) ◽  
pp. 446-453
Author(s):  
Ricardo N. Buss ◽  
Raimunda A. Silva ◽  
Glécio M. Siqueira ◽  
Jairo O. R. Leiva ◽  
Osmann C. C. Oliveira ◽  
...  
Keyword(s):  
Spatial Variability ◽  
Carbon Stock ◽  
Management Strategies ◽  
Covariance Structure ◽  
Principal Component ◽  
Spherical Model ◽  
Soybean Yield ◽  
Soil Attributes ◽  
Physical Attributes ◽  
Chemical Attributes

ABSTRACT The objective of this study was to evaluate the spatial variability of soybean yield, carbon stock, and soil physical attributes using multivariate and geostatistical techniques. The attributes were determined in Oxisols samples with clayey and cohesive textures collected from the municipality of Mata Roma, Maranhão state, Brazil. In the study area, 70 sampling points were demarcated, and soybean yield and soil attributes were evaluated at soil depths of 0-0.20 and 0.20-0.40 m. Data were analysed using multivariate analyses (principal component analysis, PCA) and geostatistical tools. The mean soybean yield was 3,370 kg ha-1. The semivariogram of productivity, organic carbon (OC), and carbon stock (Cst) at the 0-0.20 m layer were adjusted to the spherical model. The PCA explained 73.21% of the variance and covariance structure between productivity and soil attributes at the 0-0.20 m layer [(PCA 1 (26.89%), PCA 2 (24.10%), and PCA 3 (22.22%)] and 68.64% at the 0.20-0.40 m layer [PCA 1 (31.95%), PCA 2 (22.83%), and PCA 3 (13.85%)]. The spatial variability maps of the PCA eigenvalue scores showed that it is possible to determine management zones using PCA 1 in the two studied depths; however, with different management strategies for each of the layers in this study.

WATER TABLE DEPTH SPATIAL VARIABILITY IN AN ALLUVIAL SOIL OF THE SEMI-ARID REGION OF BRAZIL

2001 ◽  
Author(s):  
Maria Sallydelândia Sobral de Farias ◽  
Vera Lúcia Antunes de Lima ◽  
Tumkur Rajaro Gopinath ◽  
José Dantas Neto ◽  
Carlos Alberto Vieira de Azevedo
Keyword(s):  
Spatial Variability ◽  
Water Table ◽  
Arid Region ◽  
Alluvial Soil ◽  
Water Table Depth ◽  
Semi Arid Region ◽  
Semi Arid

scholarly journals Zooplankton assemblages in eutrophic reservoirs of the Brazilian semi-arid

2013 ◽  
Vol 73 (1) ◽  
pp. 37-52 ◽  
Author(s):  
EM. Eskinazi-Sant'Anna ◽  
R. Menezes ◽  
IS. Costa ◽  
M. Araújo ◽  
R. Panosso ◽  
...  
Keyword(s):  
Arid Region ◽  
Temporal Dynamics ◽  
Spatial Differentiation ◽  
Zooplankton Community ◽  
Northeastern Brazil ◽  
Calanoid Copepods ◽  
Phytoplankton Assemblages ◽  
Semi Arid Region ◽  
Eutrophic Reservoirs ◽  
Semi Arid

Species composition, density, and temporal dynamics of zooplankton were studied in six reservoirs in a semi-arid region in tropical northeastern Brazil (Rio Grande do Norte state). All the reservoirs are highly eutrophic, with high contents of total nitrogen (minimum of 1200 µg.L-1) and total phosphorus (minimum of 10 µg.L-1), and extremely high algal biomass was registered (surpassing 20 µg Chl a.L-1). All the reservoirs showed an enduring condition of high turbidity and phytoplankton assemblages dominated by cyanobacteria. Zooplankton also showed quantitative patterns suggestive of eutrophic conditions, expressed by high densities, mainly in Passagem das Traíras and Sabugi reservoirs. A spatial differentiation in the composition of the zooplankton community was registered. Rotifers (especially Keratella tropica, Brachionus havanensis, and Keratella americana) were the dominant forms in the zooplankton community of Itans, Passagem das Traíras, and Sabugi reservoirs, while calanoid copepods (mainly Notodiaptomus cearensis) dominated in the Armando Ribeiro, Gargalheiras, and Parelhas systems. The existence of novel relationships in zooplankton community composition in eutrophic reservoirs in this tropical semi-arid region must be considered in designating zooplankton indicators of eutrophic conditions.

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