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Field sampling and mapping strategies for balancing nitrogen to variable soil water across landscapes

Creator:: Roberts, Michael C. (Michael Coy), 1951-
Resource Type:: Dissertation
Full Text:: thesis. I would like to thank Dr. Floyd E. Bolton for support and assistance with this thesis. ii

The effect of precipitation variation on soil moisture, soil nitrogen, nitrogen response and winter wheat yields in eastern Oregon

Creator:: Glenn, D. M. (David Michael)
Abstract:: The semi-arid regions of the Pacific Northwest are characterized by a high degree of annual temperature and precipitation variation. As a result of this climatic variation, dryland nitrogen fertilizer trials on fallow- ,wheat rotations typically demonstrate a variable response. Wheat growers in the area must not only cope with this...
Resource Type:: Dissertation
Full Text:: ACKNOWLEDGMENTS I would like to express my sincere appreciation to Dr. Floyd E. Bolton for his guidance

Nitrate-nitrogen accumulation in the surface soil during the fallow period under different precipitation levels and tillage systems

Creator:: Senel, Atila Huseyin
Abstract:: The effects of different fallow moisture levels and tillage systems on the amount of nitrate-nitrogen accumulation in the 0-30 cm soil profile were studied. Fallow moisture treatments simulating typical dry, normal and wet precipitation cycles were established on trial plots. Data were obtained for nitrate-nitrogen, soil moisture and nitrogen mineralization...
Resource Type:: Masters Thesis
Full Text:: DIFFERENT PRECIPITATION LEVELS AND TILLAGE SYSTEMS Redacted for privacy Floyd E.' Bolton Abstract

Effects of tillage systems on nitrate-nitrogen accumulation and soil structure

Creator:: Avcin, Abdulkadir
Abstract:: Effects of different tillage systems on nitrate-nitrogen accumulation in a 120 cm profile and on soil structure in the top 30 cm of the profile were studied under a fallow-wheat rotation. Treatment effects on nitrate-nitrogen, soil moisture and soil aggregation were measured. Fallow tillage treatments consisting of bare fallow, stubble-mulch...
Resource Type:: Masters Thesis
Full Text:: express my appreciation to Dr. Floyd E. Bolton for his encouragement, help and friendship. I thank Dr. A

The effect of direct application of liquid fertilizers on the germination, emergence and seedling growth of wheat (Triticum aestivum L.)

Creator:: Venegas, Cesar Rolando
Abstract:: The effect of four basic liquid fertilizers: Solution 32, 10-34-0-.9, Thio-Sul, and Potash solution; and one commercial liquid fertilizer, Feast 9-18-9, on germination, emergence, and seedling growth of wheat (Triticum aestivum L.) were evaluated under laboratory, greenhouse, and field conditions. Experiments included: 1) preliminary study of basic fertilizer sources to...
Resource Type:: Masters Thesis
Full Text:: Floyd E. Bolton The effect of four basic liquid fertilizers: Solution 32, 10-34-0-.9, Thio-Sul, and

Soil moisture and temperature relationships under fallow in eastern Oregon

Creator:: Russelle, Michael P.
Abstract:: Time of stand establishment is a critical factor affecting yields of winter wheat and barley in the fallow-crop rotation areas of the Pacific Northwest. Farmers in this winter-rainfall region are dependent on residual moisture in the seed zone for germination, because significant precipitation does not usually occur until after the...
Resource Type:: Masters Thesis
Full Text:: TEMPERATURE RELATIONSHIPS UNDER FALLOW IN EASTERN OREGON Redacted for Privacy Abstract approved: Floyd E

Nitrogen timing and placement effects on grain and plant nitrogen, and grain yield in hard red winter wheat

Creator:: Bohle, Mylen G.
Abstract:: Hard red winter wheat has the potential to be an alternative crop in the Pacific Northwest, however percent grain nitrogen has been unacceptably low and grain yields have been about only 80% of soft white winter wheat. During the late spring and the summer months there is usually little rainfall,...
Resource Type:: Masters Thesis
Full Text:: :_Redacted for Privacy Floyd E. Bolton Hard red winter wheat has the potential to be an alternative crop in

Response of wheat (Triticum aestivum L.) cultivars and downy brome (Bromus tectorum L.) to metribuzin and ethyl metribuzin

Creator:: Munir, Muhammad
Abstract:: Downy brome (Bromus tectorum. L.), a serious grass weed in eastern Oregon can be partially controlled in wheat by metribuzin [4-amino-6-tertbutyl- 3-(methylthio)-as triazin -5(4H)-one]. However, cultivars of many crops Lave been reported to differ in their level of tolerance to metribuzin. This lack of tolerance has led to the investigation...
Resource Type:: Dissertation
Full Text:: Ethyl metribuzin. Redacted for Privacy Abstract approved : Dr. Floyd E. Bolton Downy brome (Bromus

Effect of nitrogen and water stresses during tillering and grain- filling in wheat

Creator:: Ashraf, Muhammad, 1952-
Abstract:: The CERES-Wheat Crop Growth and Development model treats temperature, nitrogen and water stresses as limiting factors. For each day the model calculates a stress index for temperature, N and water, compares the magnitude of the indices, and then adjusts the calculated daily potential growth using the index of the most...
Resource Type:: Dissertation
Full Text:: would like to express my sincere gratitude to Dr. Floyd E. Bolton for his guidance, encouragements

Ryegrass fluorescence expression during three generations of seed increase and its heritability among half-sib families

Creator:: Floyd, Donald J.
Abstract:: Seedling root fluorescence (SRF) has been used as a test in the USA since 1941 to discriminate Italian ryegrass (Lolium multiflorum Lam.) from perennial ryegrass (L. perenne L.). Generally, roots of Italian ryegrass fluorescece when exposed to ultraviolet light, while roots of perennial ryegrass do not. Presence of fluorescent seedlings...
Resource Type:: Dissertation
Full Text:: . Floyd for the degree of Doctor of Philosophy in Crop Science presented on April 28, 2000. Title

ScholarsArchive@OSU

Field sampling and mapping strategies for balancing nitrogen to variable soil water across landscapes

The effect of precipitation variation on soil moisture, soil nitrogen, nitrogen response and winter wheat yields in eastern Oregon

Nitrate-nitrogen accumulation in the surface soil during the fallow period under different precipitation levels and tillage systems

Effects of tillage systems on nitrate-nitrogen accumulation and soil structure

The effect of direct application of liquid fertilizers on the germination, emergence and seedling growth of wheat (Triticum aestivum L.)

Soil moisture and temperature relationships under fallow in eastern Oregon

Nitrogen timing and placement effects on grain and plant nitrogen, and grain yield in hard red winter wheat

Response of wheat (Triticum aestivum L.) cultivars and downy brome (Bromus tectorum L.) to metribuzin and ethyl metribuzin

Effect of nitrogen and water stresses during tillering and grain- filling in wheat

Ryegrass fluorescence expression during three generations of seed increase and its heritability among half-sib families

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