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Genesis of silica-enriched agricultural pans in soils managed under wheat-fallow cropping systems

Creator:: Al-ismaily, Said S.
Resource Type:: Masters Thesis
Full Text:: of Master of Science in Soil Science presented on May 12. 1997. Title: Genesis of Silica-Enriched

Phosphorus availability in biosolids-amended soils

Creator:: Choate, Jeff
Abstract:: Quantifying labile phosphorus (P) pools in biosolids is needed to manage biosolids for both agronomic and environmental purposes. Phosphorus indices originated in an effort to protect surface water quality from-non-point-agricultural P inputs. The objectives of this research were to: (1) evaluate soil test components of the western Oregon P index...
Resource Type:: Masters Thesis
Full Text:: research were to: (1) evaluate soil test components of the western Oregon P index in field and laboratory

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

Measurement of microbial biomass phosphorus in Oregon soils

Creator:: Claycomb, Peter T.
Resource Type:: Masters Thesis
Full Text:: of soil E. 3. Changes in gravimetric water content of field 61 soils during the sampling period. 4a

Carbon fluxes across three climatically-distinct forest chronosequences in Oregon

Creator:: Campbell, John
Abstract:: Biometric and gas exchange techniques were used to measure soil respiration (soil surface CO₂ efflux) and NEP (Net Ecosystem Production) across three climatically-distinct forest chronosequences in Oregon. Results indicate significant forest type, age, and forest type x age interaction effects on annual soil respiration. A regional age class distribution skewed...
Resource Type:: Dissertation

Potassium availability in some Oregon soils

Creator:: Bushnell, Vernon Clifford
Resource Type:: Dissertation
Full Text:: variety of common Oregon soil series. Western Oregon soils are classified as humid soils in spite of

Evaluation and use of a soil mineralizable nitrogen test to determine the fertilizer nitrogen needs of winter wheat grown in western Oregon

Creator:: Baloch, Dost M.
Abstract:: The assessment of optimum nitrogen (N) fertilizer need for winter wheat (Triticum aestivum L.) is important for economic and environmental sustainability. A comprehensive understanding of fertilizer N requirement depends on estimation of the quantity of N needed by the crop versus that supplied by soil. The objectives of this study...
Resource Type:: Dissertation
Full Text:: IN WESTERN OREGON CHAPTER 1 INTRODUCTION The importance of a quick, reliable soil N

Cover crop dry matter and nitrogen accumulation in Western Oregon

Creator:: Sattell, Robert, Buford, Thomas, Murray, Helene, Dick, Richard, McGrath, Daniel M. (Daniel Morton), and Oregon State University. Extension Service
Abstract:: Cover crop selection and management depend on many factors, among them the cover crop’s ability to accumulate dry matter (i.e., residues) and nitrogen (N). Dry matter provides energy for soil organisms, contributes to soil organic matter, improves tilth, and acts as a sink for nutrients.
Resource Type:: Technical Report
Full Text:: in dry matter varies considerably with cover crop type, stage of growth, and soil N content. Legumes

Cover crops and biochemical functional diversity in relation to nitrogen availability in soil

Creator:: Burket, John Zimmerman
Abstract:: Nitrogen availability in agricultural soils from fertilizer, plant residue inputs, and soil organic matter has important implications beyond crop yield. Legume winter cover crops and one fourth the recommended N rate on sweet corn resulted in yields equivalent to those at the recommended rate in the Willamette Valley of western...
Resource Type:: Dissertation
Full Text:: of Oregon, a model using total soil N and J3- glucosidase activity provided the best model of

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

ScholarsArchive@OSU

Genesis of silica-enriched agricultural pans in soils managed under wheat-fallow cropping systems

Phosphorus availability in biosolids-amended soils

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

Measurement of microbial biomass phosphorus in Oregon soils

Carbon fluxes across three climatically-distinct forest chronosequences in Oregon

Potassium availability in some Oregon soils

Evaluation and use of a soil mineralizable nitrogen test to determine the fertilizer nitrogen needs of winter wheat grown in western Oregon

Cover crop dry matter and nitrogen accumulation in Western Oregon

Cover crops and biochemical functional diversity in relation to nitrogen availability in soil

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

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