Index Catalog // ScholarsArchive@OSU

Inorganic nitrogen and soil biological dynamics in cover crop systems

Creator:: Kauffman, Susan Muna
Resource Type:: Masters Thesis
Full Text:: Soil 76:197-212. Trudgill, S.T., T.P. Burt, A.L. Heathwaite, and B.P. Arkell. 1991. Soil nitrate

Nitrate and water under terraced dryland wheat production in Oregon

Creator:: Strock, Jeffrey S.
Abstract:: Dry land agriculture using summer fallow is a common crop production practice in the Columbia Plateau region of eastern Oregon. Farmed-over level terraces are used to control surface water runoff and soil erosion. More than 70 percent of the average annual precipitation around Pendleton, Oregon (350 - 400 mm) falls...
Resource Type:: Masters Thesis
Full Text:: MATERIALS AND METHODS 30 Location 30 Measurements 31 Soil sampling 31 Soil moisture content 32

Effects of 20 years of litter and root manipulations on soil organic matter dynamics

Creator:: Wig, Jennifer D.
Abstract:: Globally, the forestry sector is the second largest contributor of greenhouse gases, and sustainable forest management is a major target of international environmental policy. However, there is the assumption underlying many policy recommendations that an increase in above-ground carbon stocks correspond to long term increases in ecosystem carbon stocks, the...
Resource Type:: Masters Thesis
Full Text:: in soil respiration rates, probably due to decreases in moisture and organic matter content, but

Deep soil nitrogen survey, Lower Umatilla Basin, Oregon

Creator:: del Nero, Zachary Augustus
Abstract:: Soils of 49 agricultural and 2 "native condition" sites in the Lower Umatilla Basin, Oregon were sampled for nitrate-nitrogen, ammonium-nitrogen, chloride, and pH beginning in Fall of 1992. Several sites were sampled in Spring and Fall 1993 in order to indicate movement or loss of residual soil nitrogen over time....
Resource Type:: Masters Thesis
Full Text:: management practices- primarily irrigation, fertilization, and crop rotation systems, and deep soil nitrate

Chemical properties of soils related to seasonal fluctuations in exchangeable potassium

Creator:: Etter, Harold Mac Donald
Abstract:: Representative sites of the Dayton, Woodburn, Jory, Quillayute, Astoria, Willamette, Walla Walla, Deschutes, Laki and Owyhee soil series were investigated for seasonal changes in exchangeable potassium in air dry samples. No consistent seasonal variations were found which could be attributed to wetting and drying in the field. Cropping reduced the...
Resource Type:: Masters Thesis
Full Text:: relationship between clay content vs air dry or oven dry exchangeable K, especially for the soil Edina #32 in

Soil factors related to potassium deficiency of stone fruits in the Willamette Valley

Creator:: Selig, Randy S.
Resource Type:: Masters Thesis
Full Text:: , water volume infiltrated, and initial soil water content upon movement of K from surface applied

Soil biological indices and nitrogen availability during a simulated transition from inorganic to organic sources of nitrogen

Creator:: Fauci, Mary F.
Resource Type:: Masters Thesis
Full Text:: matter content and biological activity. These soil were used in a greenhouse study conducted to

The potassium status of Eastern and Central Oregon soils

Creator:: Abuzkhar, Ahmed Ali
Abstract:: The potassium status of selected soils from central and eastern Oregon, that have shown a wide range in response from potassium was investigated. The silt and clay minerals were identified using X-ray crystallography. The potassium extracted by water, NH₄OAc, and HNO₃ was evaluated on the total soil and on the...
Resource Type:: Masters Thesis
Full Text:: order of increas- ing clay content, which also placed the soil groups in geographical areas. The

Nitrate nitrogen accumulation and distribution in the soil profile during a fallow grain rotation as influenced by different levels of soil profile moisture

Creator:: Aktan, Selman
Abstract:: The effect of different soil moisture levels on the amount and location of NO₃ -N accumulation in the soil profile were studied. The cultivars used in this study were Mcdermid, a soft white winter wheat, and Hudson, a medium early winter barley. Moisture treatments simulating dry, normal and wet fallow...
Resource Type:: Masters Thesis
Full Text:: the nitrate content of the surface 15 cm of summer fallow soil was depressed by straw application

The mobility and plant availability of boron in selected western Oregon soils

Creator:: Parker, David R.
Abstract:: Several crops grown in the Willamette valley of western Oregon respond to applications of boron fertilizers. The acid, highly-leached soils of this area are naturally low in plant-available B. Application of B to the soil annually or at less frequent intervals is currently recommended, but the fate of applied B...
Resource Type:: Masters Thesis
Full Text:: leachate decreased as soil organic matter, clay, and free iron and aluminum oxide content increased. The

ScholarsArchive@OSU

Inorganic nitrogen and soil biological dynamics in cover crop systems

Nitrate and water under terraced dryland wheat production in Oregon

Effects of 20 years of litter and root manipulations on soil organic matter dynamics

Deep soil nitrogen survey, Lower Umatilla Basin, Oregon

Chemical properties of soils related to seasonal fluctuations in exchangeable potassium

Soil factors related to potassium deficiency of stone fruits in the Willamette Valley

Soil biological indices and nitrogen availability during a simulated transition from inorganic to organic sources of nitrogen

The potassium status of Eastern and Central Oregon soils

Nitrate nitrogen accumulation and distribution in the soil profile during a fallow grain rotation as influenced by different levels of soil profile moisture

The mobility and plant availability of boron in selected western Oregon soils

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