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• 81. [Article] Requirements for successful irrigation systems in the Senegal River Basin (Mauritania)

  Implementation of a small-scale irrigation project in southern Mauritania is analyzed in this report. The main objective is to demonstrate that small-scale irrigation farming is the best suited solution ...

  Citation × Citation Citation Abstract Copy Title: Requirements for successful irrigation systems in the Senegal River Basin (Mauritania) Author: Abba, Fatima Zahra Implementation of a small-scale irrigation project in southern Mauritania is analyzed in this report. The main objective is to demonstrate that small-scale irrigation farming is the best suited solution for Mauritania's agriculture. To reach this objective different steps are taken in this study. The first step highlights the different aspects affecting the development of agriculture in the Senegal River basin such as climatic, environmental, and socio-economic constraints. The next step is the design of a small-scale irrigation system for a small region in the middle valley of the Senegal River called the Dirol plain. Finally, analysis and discussion of the design is made. This discussion centers on the problems faced during the design and the different assumptions made to implement it. The conclusion section addresses the feasibility of the design and gives recommendations that will help improve the design process for future work in the Senegal River basin. Title: Requirements for successful irrigation systems in the Senegal River Basin (Mauritania) Author: Abba, Fatima Zahra Implementation of a small-scale irrigation project in southern Mauritania is analyzed in this report. The main objective is to demonstrate that small-scale irrigation farming is the best suited solution for Mauritania's agriculture. To reach this objective different steps are taken in this study. The first step highlights the different aspects affecting the development of agriculture in the Senegal River basin such as climatic, environmental, and socio-economic constraints. The next step is the design of a small-scale irrigation system for a small region in the middle valley of the Senegal River called the Dirol plain. Finally, analysis and discussion of the design is made. This discussion centers on the problems faced during the design and the different assumptions made to implement it. The conclusion section addresses the feasibility of the design and gives recommendations that will help improve the design process for future work in the Senegal River basin. Close

• 82. [Article] The demand for electricity in western U.S. irrigated agriculture : a dual cost function analysis

  The overall objective of the research reported here is to empirically measure the ability of farmers to mitigate the impact of rising electricity prices by substituting relatively inexpensive alternative ...

  Citation × Citation Citation Abstract Copy Title: The demand for electricity in western U.S. irrigated agriculture : a dual cost function analysis Author: Connor, Jeffery Dean The overall objective of the research reported here is to empirically measure the ability of farmers to mitigate the impact of rising electricity prices by substituting relatively inexpensive alternative inputs. A dual cost methodology is employed because it allows theoretically consistent derivation of own price and factor substitution elasticities, conditional upon exogenously determined environmental, economic and technological constraints. Furthermore, the framework allows for an assessment of the appropriateness of producer cost minimization behavior, which has been assumed but not explicitly tested in earlier studies. A secondary objective is to analyze possible implications of future irrigation electricity price changes on producer, regional economic and electric utility company welfare. The most notable finding is that the demand for irrigation electricity is quite price elastic. This indicates that, historically, when the price of electricity has been relatively high, producers have found ways to use less of this input. The derived price elasticity of demand for irrigation electricity (-1.45) confirms results of other researchers. Gardener and Young; Whittlesey; and Maddigan, Chern and Rizy all estimated price elasticity for irrigation in the range from -1 to -2. Tests of the conditions necessary to maintain the assumption of cost minimization, do not confirm that this assumption is strictly justified in the present study. Title: The demand for electricity in western U.S. irrigated agriculture : a dual cost function analysis Author: Connor, Jeffery Dean The overall objective of the research reported here is to empirically measure the ability of farmers to mitigate the impact of rising electricity prices by substituting relatively inexpensive alternative inputs. A dual cost methodology is employed because it allows theoretically consistent derivation of own price and factor substitution elasticities, conditional upon exogenously determined environmental, economic and technological constraints. Furthermore, the framework allows for an assessment of the appropriateness of producer cost minimization behavior, which has been assumed but not explicitly tested in earlier studies. A secondary objective is to analyze possible implications of future irrigation electricity price changes on producer, regional economic and electric utility company welfare. The most notable finding is that the demand for irrigation electricity is quite price elastic. This indicates that, historically, when the price of electricity has been relatively high, producers have found ways to use less of this input. The derived price elasticity of demand for irrigation electricity (-1.45) confirms results of other researchers. Gardener and Young; Whittlesey; and Maddigan, Chern and Rizy all estimated price elasticity for irrigation in the range from -1 to -2. Tests of the conditions necessary to maintain the assumption of cost minimization, do not confirm that this assumption is strictly justified in the present study. Close

• 83. [Article] The Columbia basin irrigation project. A report by Columbia basin survey commission, state of Washington, 1920

  Gerald W. Williams Collection

  Citation × Citation Citation Abstract Copy Title: The Columbia basin irrigation project. A report by Columbia basin survey commission, state of Washington, 1920 Author: Chase, Marvin, Washington (State). Columbia Basin Survey Commission Gerald W. Williams Collection Title: The Columbia basin irrigation project. A report by Columbia basin survey commission, state of Washington, 1920 Author: Chase, Marvin, Washington (State). Columbia Basin Survey Commission Gerald W. Williams Collection Close

• 84. [Article] Crop evapotranspiration of winter wheat under deficit irrigation

  Citation × Citation Citation Abstract Copy Title: Crop evapotranspiration of winter wheat under deficit irrigation Author: Nuss, Gary Steven Title: Crop evapotranspiration of winter wheat under deficit irrigation Author: Nuss, Gary Steven Close

• 85. [Article] The impact of supplemental irrigation on farm organizations in Polk County Oregon

  Citation × Citation Citation Abstract Copy Title: The impact of supplemental irrigation on farm organizations in Polk County Oregon Author: Caldwell, Harvey Wilbur Title: The impact of supplemental irrigation on farm organizations in Polk County Oregon Author: Caldwell, Harvey Wilbur Close

• 86. [Article] The response of winter wheat to irrigation in the Willamette Valley

  Some consideration has been given to the irrigation of winter wheat in the Willamette Valley of Oregon. This important crop has yielded quite well since the development and introduction of the stiff-strawed, ...

  Citation × Citation Citation Abstract Copy Title: The response of winter wheat to irrigation in the Willamette Valley Author: Rossner, John Theodore Some consideration has been given to the irrigation of winter wheat in the Willamette Valley of Oregon. This important crop has yielded quite well since the development and introduction of the stiff-strawed, semi-dwarf wheats, but, because of the usually dry early summers, it has been suggested that irrigation of winter wheat could probably increase the yield still further. The objective of this study was to determine the response of winter wheat to supplemental irrigation when grown under various levels of spring applied nitrogen on two important soil series. Moisture changes in the soil were followed in late spring and early summer as another phase of the study. Two winter wheat varieties were sown in October 1966 at two locations in the Willamette Valley. Each variety received supplemental nitrogen in the early spring and irrigation in late May or in June. Grain was harvested about August 1 and the yield in bushels per acre was determined. Soil moisture changes were studied at the same two locations with the use of gypsum blocks buried in the soil at different depths and at another location by soil core samples. Readings from the gypsum blocks were converted to percent moisture in the soil by a series of calculations. Based on the increase of grain yields under the various treatments, the use of nitrogen fertilizer appears to be a more practical means of increasing grain yields than does irrigation. Only a slight response to irrigation was noted. Decrease in moisture content of the soil occurred particularly in the top four feet. The largest moisture decrease occurred in the top foot, the next largest decrease was in the second foot, then the third foot, and then the fourth foot. Some moisture decrease was noted below four feet; however, the amount of decrease was small. It appears from the limited observations that soils in the Willamette Valley contain enough moisture for wheat to complete its development with little or no moisture stress. Title: The response of winter wheat to irrigation in the Willamette Valley Author: Rossner, John Theodore Some consideration has been given to the irrigation of winter wheat in the Willamette Valley of Oregon. This important crop has yielded quite well since the development and introduction of the stiff-strawed, semi-dwarf wheats, but, because of the usually dry early summers, it has been suggested that irrigation of winter wheat could probably increase the yield still further. The objective of this study was to determine the response of winter wheat to supplemental irrigation when grown under various levels of spring applied nitrogen on two important soil series. Moisture changes in the soil were followed in late spring and early summer as another phase of the study. Two winter wheat varieties were sown in October 1966 at two locations in the Willamette Valley. Each variety received supplemental nitrogen in the early spring and irrigation in late May or in June. Grain was harvested about August 1 and the yield in bushels per acre was determined. Soil moisture changes were studied at the same two locations with the use of gypsum blocks buried in the soil at different depths and at another location by soil core samples. Readings from the gypsum blocks were converted to percent moisture in the soil by a series of calculations. Based on the increase of grain yields under the various treatments, the use of nitrogen fertilizer appears to be a more practical means of increasing grain yields than does irrigation. Only a slight response to irrigation was noted. Decrease in moisture content of the soil occurred particularly in the top four feet. The largest moisture decrease occurred in the top foot, the next largest decrease was in the second foot, then the third foot, and then the fourth foot. Some moisture decrease was noted below four feet; however, the amount of decrease was small. It appears from the limited observations that soils in the Willamette Valley contain enough moisture for wheat to complete its development with little or no moisture stress. Close

• 87. [Article] Irrigation requirements for selected Oregon locations

  Citation × Citation Citation Abstract Copy Title: Irrigation requirements for selected Oregon locations Author: Basketfield, Daniel L. Title: Irrigation requirements for selected Oregon locations Author: Basketfield, Daniel L. Close

• 88. [Article] Capital used in the development of newly irrigated farms on the north unit, Deschutes Project, Oregon

  Citation × Citation Citation Abstract Copy Title: Capital used in the development of newly irrigated farms on the north unit, Deschutes Project, Oregon Author: Van Winkle, Alfred Eugene Title: Capital used in the development of newly irrigated farms on the north unit, Deschutes Project, Oregon Author: Van Winkle, Alfred Eugene Close

• 89. [Article] Accuracy, range, and convenience of certain methods and devices used in measurement of irrigation water

  Citation × Citation Citation Abstract Copy Title: Accuracy, range, and convenience of certain methods and devices used in measurement of irrigation water Author: Neu, Harold Wesley Title: Accuracy, range, and convenience of certain methods and devices used in measurement of irrigation water Author: Neu, Harold Wesley Close

• 90. [Article] The effect of fertilizers on the yield and quality of fiber flax produced under irrigation

  Citation × Citation Citation Abstract Copy Title: The effect of fertilizers on the yield and quality of fiber flax produced under irrigation Author: Puri, Yesh Pal Title: The effect of fertilizers on the yield and quality of fiber flax produced under irrigation Author: Puri, Yesh Pal Close