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Filtering by: Subject Soils -- Nitrate content -- Oregon Decade 1960-1969

Availability of phosphorus in central Oregon soils in comparison with selected Oregon soils

Creator:

Araos, Jose Fernando

Abstract:

The objectives of this study were to evaluate and compare the availability of native and applied P in Central Oregon pumice soils with that in Willamette valley soils and calcareous soils from Eastern Oregon. The experimental work to meet these objectives included laboratory and greenhouse studies. The removal of P...

Resource Type:

Masters Thesis

Full Text:

correlation coefficients between available soil P determined by different methods and P content and uptake
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

Full Text:

content of free Mn in soil profiles of the Willamette drainage sequence. 5a Ferrous iron content of
Effects of residual and applied nitrogen on Nugaines wheat

Creator:

Laopirojana, Pojanee

Abstract:

A study was made to evaluate the effect of different rates of N fertilization on Nugaines wheat. The variable N treatments provided different N regimes as a basis for evaluating potential diagnostic tests for assessing the N status of the wheat plant. The crop was grown in Lane county during...

Resource Type:

Masters Thesis

Full Text:

and nitrate-N content of soil to a depth of four feet on the dates indicated for the wheat experiment