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Iron and manganese distribution and seasonal oxidation changes in soils of the Willamette drainage sequence

Creator:

Somera, Rosa Duro

Abstract:

This study was conducted to investigate the differences of the profile distribution of free iron and free manganese and the reduction-oxidation changes in soils of the Willamette drainage sequence. Based on the results of the chemical analyses, free iron and free manganese distributions in these soils were governed to a...

Resource Type:

Masters Thesis
Septic-tank drainfield performance in five Willamette Valley soils

Creator:

Wert, Stephen R.

Abstract:

Permeability, effects of age, and water table fluctuations were studied for nine drainfields in five soil types ranging from well to poorly drained. Three sites were in Willamette, one in Woodburn, two in Amity, two in Concord, and one in Dayton soils. Before permeability of drainfields could be evaluated, methods...

Resource Type:

Masters Thesis
Morphology and genesis of Gray Podzolic soils in Thailand

Creator:

Rojanasoonthon, Santhad

Abstract:

Nine Gray Podzolic soils from different physiographic regions of Thailand were studied to determine their characteristics and genesis in relation to their parent materials, land form, pedogenic environment, classification and management. The clay was characterized by X-ray diffraction and standard chemical and physical analyses were performed. Mineralogy of the light...

Resource Type:

Dissertation