Data/hora: 09/06/2024 04:39:55

Provedor de dados: 	124	
País: 	Brazil	
Título: 	Availability and spatial variability of copper, iron, manganese and zinc in soils of the State of Ceará, Brazil	
Autores: 	Oliveira,Mara Lucia Jacinto; Valladares,Gustavo Souza; Vieira,Johnston Silva; Coelho,Ricardo Marques.	
Data: 	2018-09-01	
Ano: 	2018	
Palavras-chave: 	Cationic micronutrients; Geostatistics; Ordinary kriging; Soils of the semi-arid region.	
Resumo: 	ABSTRACT The aim of the present work was to: (i) determine and map the micronutrient content (copper - Cu, iron - Fe, manganese - Mn and zinc - Zn) in soils of the State of Ceará; (ii) evaluate soil attributes related to micronutrient availability; and (iii) evaluate, by ordinary kriging, the spatial dependence of the micronutrient content. The study area is located in the central region of Ceará, in the basin of the River Banabuiú. Soil samples were collected in the surface and subsurface layers to determine the chemical attributes, granulometry, and micronutrient content, extracted with Mehlich-1 solution. The sites of the principal types of soil in the region were spatialised and the results submitted to descriptive analysis and Pearson correlation analysis. The semivariograms with the best fit were tested using the ordinary kriging method, and the maps of spatial variability were prepared. The highest values for the mean, maximum and minimum levels of Cu and Fe are found in the subsurface layers, while for Mn and Zn, they are found in the surface layers. In the surface layers, the majority of soils present Fe, Mn and Zn in levels suitable for agricultural production, while the levels of Cu are classified as medium to low. The micronutrients showed a significant positive correlation, especially with the soil attributes and with each other. Cu, Fe, Mn and Zn are classified as having medium to strong spatial dependence in the surface and subsurface layers.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300371	
Editor: 	Universidade Federal do Ceará	
Relação: 	10.5935/1806-6690.20180042	
Formato: 	text/html	
Fonte: 	Revista Ciência Agronômica  v.49 n.3 2018	
Fonte: 	info:eu-repo/semantics/openAccess