Download or read book Center Pivot Irrigation in Nebraska an Institutional Analysis Case Study written by Massachusetts Institute of Technology. Energy Laboratory and published by . This book was released on 1979 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Impact of Center pivot Irrigation on the Sand Hills of Nebraska written by Stephen F. Hoesel and published by . This book was released on 1973 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1981 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reports and Working Papers written by Massachusetts Institute of Technology. Energy Laboratory and published by . This book was released on 1983 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wheels of Fortune written by Center for Rural Affairs (Walthill, Neb.) and published by . This book was released on 1976 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Resources Research in Nebraska written by University of Nebraska--Lincoln. Water Resources Research Institute and published by . This book was released on 1976 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Irricab written by and published by . This book was released on 1983 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1984 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Cost of Center Pivot Irrigation Now written by Les Sheffield and published by . This book was released on 1974 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wheels of Fortune written by and published by . This book was released on 1976 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Minimum Center Pivot Design Capacities in Nebraska written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Groundwater Exploitation in the High Plains written by David E. Kromm and published by University Press of Kansas. This book was released on 2021-10-08 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: The High Plains region was once called the Great American Desert and thought to be, in the words of explorer Stephen Long, “wholly unfit for cultivation.” Now we know that beneath the surface, unbeknownst to the explorers and early settlers, lies the Ogallala aquifer, an underground formation that stretches for 800 miles from the Texas panhandle to South Dakota. It holds more water than Lake Huron. Indeed, the Ogallala has been referred to as the sixth Great Lake. It is the water pumped for irrigation from the Ogallala that has enabled a naturally dry region to produce up to 40 percent of America’s beef and 20 to 25 percent of its food and fiber, an output worth about $20 billion. In the forty years since the invention of center pivot irrigation, the High Plains aquifer system has been depleted at an astonishing rate. In 1978 the volume of water pumped from the aquifer exceeded the annual flow of the Colorado River. In Texas, water levels are down 200 feet in some areas. In Kansas, 700 miles of rivers that once flowed year round no longer flow at all. In short, the High Plains may be becoming the desert it was once thought to be. Is it too late to solve the problem? Geographers David Kromm and Stephen White assembled nine of the most knowledgeable scholars and water professionals in the Great Plains to help answer that question. The result is a collection of essays that insightfully examine the dilemmas of groundwater use. From a variety of perspectives they address both the technical problems and the politics of water management to provide a badly needed analysis of the implications of large-scale irrigation. They have included three case studies: the Nebraska Sand Hills, Northwestern Kansas, and West Texas. Kromm and White provide an introduction and conclusion to the volume.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1982 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conservation of Energy Using Variable Frequency Drive for Center Pivot Irrigation Systems in Nebraska written by Dilshad Brar and published by . This book was released on 2015 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study introduces a novel approach to lower the operating pivot point pressure by varying the motor speed with the help of variable frequency drive (VFD) in contrast to the commonly used fixed speed approach. By varying the speed of motor, the required minimum pivot point pressure can be provided at any required flow rate. This was investigated through a GIS-assisted simulation on 100 randomly selected pivots located in 10 Nebraska counties using high resolution Digital Elevation Model (DEM) datasets. Center pivot irrigation systems are usually equipped with corner watering attachments like end guns and corner extensions to irrigate additional area at the corners of the field. Two different types of corner watering equipment i.e. end gun and corner extension were involved in this study. Four different scenarios were taken into consideration 1) standard systems with seven towers and no corner watering attachment, 2) end gun attached at the end of center pivot system, 3) corner extension attached at end of center pivot system, and 4) center pivot system equipped with corner extension and end gun. Two different approaches were used to operate the center pivot systems 1) at constant motor speed with fixed design pivot point pressure, 2) at varying motor speed according to the minimum required pivot point pressure. The varying topography as well as the shape of the pump performance curve at fixed motor speed were found to play a major role in energy conservation. The energy reductions obtained through varying speed approach, along with annual monetary savings were calculated for all the study counties under all the scenarios. The major factors contributing to maximum energy savings and annual returns were large topographical changes, shape of pump performance curve, long irrigation operating hours, and high electricity costs. Cedar County showed the maximum average energy reductions by using varying speed approach whereas Hamilton and Butler County expressed minimum energy reductions in all the scenarios. Economic analysis was conducted for the potential investment in VFDs along with the average payback periods for the cost of VFD in each county. Overall, the suggested use of the Variable Frequency Drive has proven to provide savings in terms of energy conservation from the analysis performed in the study. However, there are emerging concerns about the cost-effectiveness of the approach. It is expected that the technology will receive high adoption, specifically in irrigation sector, from producers, research community and industry, if manufacturers are able to address economic concerns of the end user. This study provides a holistic approach in quantifying the energy savings over a large study area, which provides the producers, water resource managers, planners, and decision and policy makers, a clear picture of the widely variable anticipated benefits when aiming at adoption of a VFD.
Download or read book The Social Consequences And Challenges Of New Agricultural Technologies written by Gigi M Berardi and published by Routledge. This book was released on 2019-07-11 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although formal social impact assessment of changing technologies in U.S. agriculture is still in its infancy, scholars have been documenting the effects of new technology throughout the twentieth century. In this collection, Prcfessors Berardi and Geisler bring together historically relevant research and a carefully chosen cross section of contemporary work. Their review of the literature is followed by an evaluation of the effects of mechanization on labor and production, written in 1904, which provides a backdrop for papers from the 1940s and 1950s examining the mechanization of agriculture in the South, in the Midwest, and in rural areas in general. Subsequent chapters offer present-day insights on such topics as the socioeconomic consequences of automated vegetable and tobacco harvesting, center-pivot irrigation, and organic and no-till cultivation. The authors also look at compensation and adjustment programs for displaced labor, the relationship between technology and agribusiness growth, and the effectiveness of university programs that prepare students to perform social impact assessments in agriculture. The edited proceedings of a spirited roundtable discussion on new directions for the study of the social impacts of farm technology and the political economy of agriculture provide the thought-provoking conclusion to this overview of the field.
Download or read book Government Reports Annual Index written by and published by . This book was released on 1983 with total page 1166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1986 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
