Data/hora: 04/06/2024 12:43:09

Provedor de dados: 	90	
País: 	Brazil	
Título: 	Index of soil physical quality of hardsetting soils on the brazilian coast	
Autores: 	Lima,Herdjania Veras de; Silva,Álvaro Pires da; Giarola,Neyde Fabíola Balarezzo; Imhoff,Sílvia.	
Data: 	2014-12-01	
Ano: 	2014	
Palavras-chave: 	S index; Coastal tablelands; Soil consistency; Hardened horizons.	
Resumo: 	Many soils have a hard-setting behavior, also known as cohesive or "coesos". In such soils, the penetration resistance increases markedly when dry and decreases considerably when moist, creating serious limitations for plant emergence and growth. To evaluate the level of structure degradation in hard-setting soils with different texture classes and to create an index for assessing soil hardness levels in hard-setting soils, six soil representative profiles were selected in the field in various regions of Brazil. The following indices were tested: S, which measures soil physical quality, and H , which analyzes the degree of hardness and the effective stress in the soil during drying. Both indices were calculated using previously described functions based on data from the water-retention curves for the soils. The hard-setting values identified in different soils of the Brazilian Coastal Tablelands have distinct compaction (hardness) levels and can be satisfactorily measured by the H index. The S index was adequate for evaluating the structural characteristics of the hard-setting soils, classifying them as suitable or poor for cultivation, but only when the moisture level of the soil was near the inflection point. The H index showed that increases in density in hard-setting soils result from increases in effective stress and not from the soil texture. Values for Bd &gt; 1.48 kg dm-3 classify the soil as hard-setting, and the structural organization is considered "poor".	
Tipo: 	Info:eu-repo/semantics/other	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832014000600007	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/S0100-06832014000600007	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.38 n.6 2014	
Fonte: 	info:eu-repo/semantics/openAccess