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• 1. [Article] Towards autonomous irrigation : comparison of two moisture sensing technologies, irrigation distribution analysis, and wireless network performance at an ornamental container nursery

  As ornamental container nurseries face diminishing water allocations, many are looking to automated irrigation solutions to increase their water application efficiency. This thesis presents the findings ...

  Citation × Citation Citation Abstract Copy Title: Towards autonomous irrigation : comparison of two moisture sensing technologies, irrigation distribution analysis, and wireless network performance at an ornamental container nursery Author: Bailey, Daniel R. (Daniel Roger) As ornamental container nurseries face diminishing water allocations, many are looking to automated irrigation solutions to increase their water application efficiency. This thesis presents the findings of a study conducted at a commercial container nursery to determine 1) whether a capacitance or load cell sensor was better suited for monitoring volumetric water content in the substrate; 2) if the actual irrigation distribution conformed to the expected pattern, how uniform were the weights of plants, and how these combined with plant canopy affected the leaching fraction; and 3) the reliability of the wireless network used to transmit the data to a central database. It was found that 1) the load cells outperformed the capacitance-based sensors because the load cells took an integrated measure; 2) the actual irrigation pattern followed the expected pattern, the variation of irrigation sections were low (C.V. = 0.06) and similar (C.V. ranging from 0.029 to 0.12), and unpruned plant canopies produced greater leaching fraction than pruned canopies (P < 0.18); and 3) wireless network transmission reliability was low (75.2%), suggesting that the system was not suitable for real-time irrigation control, but was sufficient for calculating irrigation length and monitoring net effective irrigation application and evapotranspirative consumption. Title: Towards autonomous irrigation : comparison of two moisture sensing technologies, irrigation distribution analysis, and wireless network performance at an ornamental container nursery Author: Bailey, Daniel R. (Daniel Roger) As ornamental container nurseries face diminishing water allocations, many are looking to automated irrigation solutions to increase their water application efficiency. This thesis presents the findings of a study conducted at a commercial container nursery to determine 1) whether a capacitance or load cell sensor was better suited for monitoring volumetric water content in the substrate; 2) if the actual irrigation distribution conformed to the expected pattern, how uniform were the weights of plants, and how these combined with plant canopy affected the leaching fraction; and 3) the reliability of the wireless network used to transmit the data to a central database. It was found that 1) the load cells outperformed the capacitance-based sensors because the load cells took an integrated measure; 2) the actual irrigation pattern followed the expected pattern, the variation of irrigation sections were low (C.V. = 0.06) and similar (C.V. ranging from 0.029 to 0.12), and unpruned plant canopies produced greater leaching fraction than pruned canopies (P < 0.18); and 3) wireless network transmission reliability was low (75.2%), suggesting that the system was not suitable for real-time irrigation control, but was sufficient for calculating irrigation length and monitoring net effective irrigation application and evapotranspirative consumption. Close

• 2. [Article] Efficient lawn irrigation in the Intermountain West

  Published October 2010. Reviewed November 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Efficient lawn irrigation in the Intermountain West Author: Charlton, Brian A., Cook, Thomas W., Golembiewski, Robert Craig, 1969-, Oregon State University. Extension Service Published October 2010. Reviewed November 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Efficient lawn irrigation in the Intermountain West Author: Charlton, Brian A., Cook, Thomas W., Golembiewski, Robert Craig, 1969-, Oregon State University. Extension Service Published October 2010. Reviewed November 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 3. [Article] Successful onion irrigation scheduling

  Published September 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/cat...

  Citation × Citation Citation Abstract Copy Title: Successful onion irrigation scheduling Author: Klauzer, Jim, Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Jensen, Lynn Published September 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Successful onion irrigation scheduling Author: Klauzer, Jim, Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Jensen, Lynn Published September 2010. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 4. [Article] Strategies for efficient irrigation water use

  Published July 2001. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Strategies for efficient irrigation water use Author: Shock, B. M., Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Welch, Teresa Published July 2001. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Strategies for efficient irrigation water use Author: Shock, B. M., Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Welch, Teresa Published July 2001. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 5. [Article] Growing irrigated soybeans in the Pacific Northwest

  Published January 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Growing irrigated soybeans in the Pacific Northwest Author: Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Norberg, O. Steven, Shock, C. C. (Clinton C.) Published January 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Growing irrigated soybeans in the Pacific Northwest Author: Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Norberg, O. Steven, Shock, C. C. (Clinton C.) Published January 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 6. [Article] Irrigation monitoring using soil water tension

  Published November 2005. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Irrigation monitoring using soil water tension Author: Pereira, A. (Andre), Shock, C. A. (Cedric A.), Wang, F. X. (Feng-Xin), Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Flock, R. (Rebecca) Published November 2005. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Irrigation monitoring using soil water tension Author: Pereira, A. (Andre), Shock, C. A. (Cedric A.), Wang, F. X. (Feng-Xin), Feibert, Erik Bruno Goncalves, Oregon State University. Extension Service, Shock, C. C. (Clinton C.), Flock, R. (Rebecca) Published November 2005. Revised March 2013. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 7. [Article] Strip tillage for high-residue irrigated cropping systems

  Published August 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Strip tillage for high-residue irrigated cropping systems Author: Oregon State University. Extension Service, Norberg, O. Steven Published August 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Strip tillage for high-residue irrigated cropping systems Author: Oregon State University. Extension Service, Norberg, O. Steven Published August 2010. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 8. [Article] Modeling the uncertainty of evapotranspiration estimates

  Under today's environmental conditions and with the increasing worldwide competition for water, errors in irrigation management decisions can be costly. Therefore, providing both accurate evapotranspiration ...

  Citation × Citation Citation Abstract Copy Title: Modeling the uncertainty of evapotranspiration estimates Author: El Khoury, Laureine Under today's environmental conditions and with the increasing worldwide competition for water, errors in irrigation management decisions can be costly. Therefore, providing both accurate evapotranspiration estimation on a daily basis and estimation of the magnitude of error associated with this estimate is vital for informed water management decisions that allow irrigation managers to account for the associated uncertainties and risks. The present research focuses on the hypothesis, the analytical approach, and the results of a study formulated to quantify the various components of uncertainty in daily and cumulative reference (ET₀) and crop (ET[subscript c]) evapotranspiration estimates with and without accounting for serial correlation. These analyses were carried out using nine years of daily (24-h sum) standardized Penman-Monteith values of ET₀ downloaded from three CIMIS weather stations in the Sacramento Valley, one year of grass lysimeter data at Five Points, California and measured K[subscript c] using surface renewal, eddy covariance and lysimeter data in our area of interest. Moreover, strategies were developed, based on this study, to reduce the uncertainty in ET estimates. Random and systematic errors associated with CIMIS weather station data and with the Penman-Monteith model itself include: spatial variability of the weather parameters between the farm and the weather station; variations in weather station instrument accuracy; and the intrinsic errors of the daily (24-h sum) standardized PM ET₀ model. These sources of error were modeled using Monte Carlo simulation, and the simulated errors were used to modify daily ET₀ data for a specific case study in the Sacramento Valley. Modeling of errors in the crop coefficient was not possible given the limited data available; however an estimate of mid-season bias of the crop coefficient for the specific circumstances of the case study was derived from surface renewal data. The mean and standard deviation of simulated ET₀ estimates (including the embedded simulated errors) were used to characterize the errors in irrigation scheduling that would result from random, systematic and total errors in ET₀ and ET[subscript c] for different irrigation scenarios. The three alternative scenarios considered were represented as three different allowable depletions, 50 mm, 100 mm and 150 mm, between irrigations. Key elements of this research explored the importance of serial correlation in random errors and compared the errors associated with weather station factors with the intrinsic error of the Penman-Monteith model. The research also showed that observed biases in the CIMIS crop coefficient (K[subscript c]) produced a substantially greater effect than errors associated with weather station factors or intrinsic errors in the PM model. The research also found that local measurements of wind speed could considerably increase the accuracy of ET₀ estimates. Title: Modeling the uncertainty of evapotranspiration estimates Author: El Khoury, Laureine Under today's environmental conditions and with the increasing worldwide competition for water, errors in irrigation management decisions can be costly. Therefore, providing both accurate evapotranspiration estimation on a daily basis and estimation of the magnitude of error associated with this estimate is vital for informed water management decisions that allow irrigation managers to account for the associated uncertainties and risks. The present research focuses on the hypothesis, the analytical approach, and the results of a study formulated to quantify the various components of uncertainty in daily and cumulative reference (ET₀) and crop (ET[subscript c]) evapotranspiration estimates with and without accounting for serial correlation. These analyses were carried out using nine years of daily (24-h sum) standardized Penman-Monteith values of ET₀ downloaded from three CIMIS weather stations in the Sacramento Valley, one year of grass lysimeter data at Five Points, California and measured K[subscript c] using surface renewal, eddy covariance and lysimeter data in our area of interest. Moreover, strategies were developed, based on this study, to reduce the uncertainty in ET estimates. Random and systematic errors associated with CIMIS weather station data and with the Penman-Monteith model itself include: spatial variability of the weather parameters between the farm and the weather station; variations in weather station instrument accuracy; and the intrinsic errors of the daily (24-h sum) standardized PM ET₀ model. These sources of error were modeled using Monte Carlo simulation, and the simulated errors were used to modify daily ET₀ data for a specific case study in the Sacramento Valley. Modeling of errors in the crop coefficient was not possible given the limited data available; however an estimate of mid-season bias of the crop coefficient for the specific circumstances of the case study was derived from surface renewal data. The mean and standard deviation of simulated ET₀ estimates (including the embedded simulated errors) were used to characterize the errors in irrigation scheduling that would result from random, systematic and total errors in ET₀ and ET[subscript c] for different irrigation scenarios. The three alternative scenarios considered were represented as three different allowable depletions, 50 mm, 100 mm and 150 mm, between irrigations. Key elements of this research explored the importance of serial correlation in random errors and compared the errors associated with weather station factors with the intrinsic error of the Penman-Monteith model. The research also showed that observed biases in the CIMIS crop coefficient (K[subscript c]) produced a substantially greater effect than errors associated with weather station factors or intrinsic errors in the PM model. The research also found that local measurements of wind speed could considerably increase the accuracy of ET₀ estimates. Close

• 9. [Article] Harvesting rainwater for use in the garden

  Published December 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog

  Citation × Citation Citation Abstract Copy Title: Harvesting rainwater for use in the garden Author: Angima, S. D., Oregon State University. Extension Service Published December 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Title: Harvesting rainwater for use in the garden Author: Angima, S. D., Oregon State University. Extension Service Published December 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog Close

• 10. [Article] IMST Review of the USFWS and NMFS 2001 Biological Opinions on Management of the Klamath Reclamation Project and Related Reports

  This report was prepared by the Independent Multidisciplinary Science Team to the Oregon Plan for Salmon and Watersheds.

  Citation × Citation Citation Abstract Copy Title: IMST Review of the USFWS and NMFS 2001 Biological Opinions on Management of the Klamath Reclamation Project and Related Reports Author: Independent Multidisciplinary Science Team (Or.) This report was prepared by the Independent Multidisciplinary Science Team to the Oregon Plan for Salmon and Watersheds. Title: IMST Review of the USFWS and NMFS 2001 Biological Opinions on Management of the Klamath Reclamation Project and Related Reports Author: Independent Multidisciplinary Science Team (Or.) This report was prepared by the Independent Multidisciplinary Science Team to the Oregon Plan for Salmon and Watersheds. Close