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Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrosols in north-west Tasmania


Cotching, W and Belbin, K, Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrosols in north-west Tasmania, Australian Journal of Soil Research, 45, (2) pp. 147-152 . ISSN 0004-9573 (2007) [Refereed Article]

DOI: doi:10.1071/SR06113


The relationship of soil wetness to soil strength in Red Ferrosols was compared between fields of well structured to degraded soil structure. Soil structure was assessed using a visual rating. Soil resistance measurements were taken over a range of soil wetness, using a recording penetrometer. Readings were taken as the soil dried by evapotranspiration after both irrigation and rainfall events. The influence of soil wetness on penetration resistance was greater on fields with degraded structure than on well-structured fields. In fields with degraded structure, the wetter the soil, the smaller were the penetration resistance values. Field soil structure score was negatively correlated with the slope of the line relating soil wetness and penetration resistance at 150-300 mm depth. The structurally degraded fields had a highly significant relationship between penetration resistance and soil wetness at 150-300 mm depth. In well-structured fields, variations in soil wetness had less effect on penetration resistance. These results indicate that visual assessment can be used with confidence to assess Ferrosol structure. The implications for soil management are that fields with degraded soil structure have greater resistance to root growth at drier moisture contents than well-structured fields. Consequently, farmers need to keep degraded soils wetter with more frequent irrigation than well-structured soils, to ensure optimum plant growth. © CSIRO 2007.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Soil sciences
Research Field:Soil physics
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Evaluation, allocation, and impacts of land use
UTAS Author:Cotching, W (Dr Bill Cotching)
UTAS Author:Belbin, K (Ms Kristel Belbin)
ID Code:40942
Year Published:2007
Web of Science® Times Cited:5
Deposited By:Agricultural Science
Deposited On:2007-08-01
Last Modified:2008-05-14

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