Download or read book The Economic Feasibility of Variable Rate Irrigation Technology for Wetland Restoration written by Karina Schoengold and published by . This book was released on 2019 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this NebGuide is to evaluate the economic feasibility of installing variable rate irrigation with a cost-share program when restoring wetlands on previously cropped land. (Page 1)
Download or read book The Economic Feasibility of Irrigation System Modifications written by Daniel R. DeLano and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variable Rate Irrigation written by Miguel Jesus Jimenez-Berni and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Agriculture is the largest user of fresh water in the world. Therefore, any improvement in the efficiency of irrigation water use will result in cost reduction and the possibility of larger irrigated areas. This communication presents a precision irrigation system based on a wireless network of sensors and actuators in which a high level of control is achieved by means of valve automation. Water needs are calculated based on the crop characteristics, soil information, and the design of the irrigation system. Regional real-time weather data were obtained from the California Irrigation Management Information System (CIMIS). A new software system was developed to manage and control multiple valve groups according to different crops and strategies, and to make decisions on when and for how long to irrigate. The system was tested in almonds and walnuts where strategies based on evapotranspiration, stem water potential, and grower opinion were carried out. A total of 36 five-tree units were controlled with valves operated by the control software. Water use, yield, and nut quality were measured to analyze differences between the irrigation strategies. A cost/benefit analysis was also done using current water costs in different California agricultural regions. The use of this variable rate system to control irrigation based on evapotranspiration resulted in water savings of 1,776 m3/ha for almonds and 995 m3/ha for walnuts compared to normal grower control. Despite the reduction of water use, at current water costs these savings will not compensate for the differences in yield.
Download or read book Fundamentals of Variable Rate Irrigation and Fertigation in Comparison to Fixed Rate Irrigation and Conventional Fertilizer Management written by Vasudha Sharma and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The potential positive or negative impact(s) of variable rate irrigation (VRI) and fertigation (VRF) technologies on evapotranspiration, grain yield, crop productivity and its economic viability are not well known. Proper management of this technology requires research support which is currently limited. This long-term research is designed to estimate and compare the soil water dynamics, grain yields, actual evapotranspiration, crop water productivities, crop coefficients and economics of VRI, fixed rate irrigation (FRI) and no-irrigation (NI) under fix rate fertigation (FRF), variable rate fertigation (VRF) and pre-plant nitrogen application (PP) management in three soil types as well as to develop best management practices for maize. The research was conducted in south central Nebraska from 2015 to 2017 maize growing seasons. Irrigation and fertilizer amounts were applied using a variable-rate linear move irrigation system. The results of this research showed significant differences in the response of maize to irrigation and nitrogen management methods between soil types and within soil types. In 2016, significant impact of nitrogen and irrigation treatments was observed on ETa. There was significant interactions between soil type, irrigation and nitrogen treatments for the 2017 growing season. There was no significant impact of nitrogen application methods on grain yield in any year. Field topography, especially elevation and slope played a substantial role in yield response to different irrigation methods by redirecting and altering soil water availability. The results of this research show that slopes and intercepts of the linear ETa-yield production functions can differ significantly with differences irrigation and nitrogen management practices such as VRI and FRI as well as with soil types. Crop water use efficiency (CWUE), Irrigation water use efficiency (IWUE) and Evapotranspiration water use efficiency (ETWUE) exhibited substantial variation the irrigation treatments. The results of this research indicated that the magnitude of alfalfa reference crop coefficients (Kcr) and grass reference crop coefficients (Kco) depends upon the amount of irrigation water applied. Also, the magnitude of K cr and Kco are the function of the amount of nitrogen and not the timing of nitrogen. Maximum Kcr usually occurred in high nitrogen treatments. The results of this research indicated that for the same settings as the research, the VRI management is not an economically viable option for maize production in south central Nebraska.
Download or read book Application of Variable rate Irrigation Technology to Conserve Water and Improve Crop Productivity written by Aghil Yari and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Variable-rate irrigation (VRI) is an emerging technology to optimize water and energy consumption, increase crop yields, and minimize environmental impacts. The goals of this research project were to assess the performance of VRI, to investigate field spatial and temporal variability for delineating irrigation management zones, and to quantify the potential water and energy savings, and crop productivity benefits of VRI for two crop types in southern Alberta. The research included a four-year field experiment during the 2013 to 2016 growing seasons at the Alberta Irrigation Technology Centre (AITC) in southern Alberta, Canada. In the 2013 and 2014 growing seasons, the experimental site was seeded to Hard Red Spring (HRS) wheat, and during the 2015 and 2016 growing seasons, Russet Burbank potato was planted. In 2013 and 2014, the performance of a center pivot irrigation system (CPIS) retrofitted with a commercial VRI package was assessed. Overall, the uniformity of application both along the system's lateral and in the travel direction were above 90% for the majority of the trials under the different wind speeds and water application depths. Wind speeds greater than 3.3 m s-1 reduced application uniformity by 3.9%. The volumetric flow measurement of the system indicated that up to 34% water savings can be achieved with VRI versus non-VRI. Moreover, the average energy cost decreased by 18% with VRI during the 2013 and 2014 seasons due to non-application of water to areas such as ponds, roads, and non-cropped areas in the study site. In an effort to delineate irrigation management zones for VRI application, temporal and spatial variation of soil physical and chemical properties were assessed. A stepwise multivariate regression approach and a fuzzy C-mean clustering algorithm were used to identify optimum number of variables for management zone delineation. It was found that soil electrical conductivity (EC), pH, and field elevation were the best of 10 parameters for management zone delineation. The validity criteria identified that the three management zones were optimum for the study site. Statistical analyses showed that the delineated management zones were significantly different in terms of crop yields. In the 2014 growing season, the highest wheat yield (4.80 t ha-1) was produced within the management zone three where the EC value was low and elevation was high. The lowest wheat yield (2.22 t ha-1) was in the management zone one situated in the high EC and low elevation areas. The AquaCrop model was used to optimize crop productivity within the three management zones. Simulation of HRS wheat growth in the study area under the different irrigation scenarios indicated that the crop yield would be improved with optimum irrigation application and drainage management.The study also has investigated the potato productivity under VRI technology in 2015 and 2016 growing seasons. Three irrigation applications (high, normal, and low irrigation treatments) were applied to Russet Burbank potatoes. In 2015, higher water application in the experimental plots resulted in no significant improvement to potato yield. The harvest of tubers in normal irrigation plots proved to be more uniform in quality and size of tubers. In 2016, there were no significant differences among irrigation treatments for any of the yield and quality factors analyzed." --
Download or read book Variable Rate Irrigation No Longer Fiction written by M. C. Brouwer and published by . This book was released on 2001 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wetland Creation and Restoration written by Jon A. Kusler and published by . This book was released on 1990 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a preliminary evaluation of the status of the science of wetland creation and restoration in the United States. It contains a series of regional reviews. Each review summarizes wetland creation and restoration experiences in broadly defined wetland regions (e.g. Pacific coastal wetlands, wooded wetlands of the Southeast). It also includes a series of theme papers, covering a wide range of topics of general application to wetland creation and restoration (hydrology, management techniques, planning).
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1988 with total page 1198 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Restoration of Aquatic Ecosystems written by National Research Council and published by National Academies Press. This book was released on 1992-01-01 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aldo Leopold, father of the "land ethic," once said, "The time has come for science to busy itself with the earth itself. The first step is to reconstruct a sample of what we had to begin with." The concept he expressedâ€"restorationâ€"is defined in this comprehensive new volume that examines the prospects for repairing the damage society has done to the nation's aquatic resources: lakes, rivers and streams, and wetlands. Restoration of Aquatic Ecosystems outlines a national strategy for aquatic restoration, with practical recommendations, and features case studies of aquatic restoration activities around the country. The committee examines: Key concepts and techniques used in restoration. Common factors in successful restoration efforts. Threats to the health of the nation's aquatic ecosystems. Approaches to evaluation before, during, and after a restoration project. The emerging specialties of restoration and landscape ecology.
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1988 with total page 1212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safe Use of Wastewater in Agriculture written by Hiroshan Hettiarachchi and published by Springer. This book was released on 2018-03-09 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a broad and global level description of the current status of wastewater use in agriculture and then brings the readers to various places in the MENA Region and Europe to explain how some countries and regions have addressed the challenges during implementation. On a global scale, over 20 million hectares of agricultural land are irrigated using wastewater. This is one good, and perhaps the most prominent, example of the safe use potential of wastewater. Water scarcity and the cost of energy and fertilisers are among the main factors driving millions of farmers and other entrepreneurs to make use of wastewater. In order to address the technical, institutional, and policy challenges of safe water reuse, developing countries and countries in transition need clear institutional arrangements and more skilled human resources, with a sound understanding of the opportunities and potential risks of wastewater use. Stakeholders in wastewater irrigation who need to implement from scratch or improve current conditions, find it difficult to gather the necessary information on practical implementation aspects. The main objective of this book is to bridge that gap.
Download or read book Riparian Areas written by National Research Council and published by National Academies Press. This book was released on 2002-10-10 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
Download or read book River restoration a strategic approach to planning and management written by Speed, Robert and published by UNESCO Publishing. This book was released on 2016-09-19 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feasibility Design Criteria and O M Requirements for Small Scale Constructed Wetland Wastewater Treatment Systems written by S. Wallace and published by IWA Publishing. This book was released on 2006-07-31 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The expanding use of decentralized wastewater management has resulted in an increased interest in small-scale wetland treatment systems. However, there is limited information available on the use, distribution of and performance of these small-scale systems. The purpose of this study was to address this knowledge gap by developing criteria for the feasibility, design, operation, and maintenance of small-scale wetland treatment systems. Monitoring data from the assembled small-scale wetland database was used to develop sizing criteria for FWS and VSB wetlands. Loading rates and corresponding effluent quality were developed for BOD, TSS, TKN, phosphorus, and fecal coliform bacteria. Where there was adequate data, the variation in monthly vs. annual average effluent concentration was assessed to provide a factor-of-safety approach to wetland sizing. Information on internal processes, hydraulic design, operation, maintenance, cost, and industrial applications of constructed wetlands is also presented in this report.
Download or read book Wetland Creation and Restoration Regional reviews written by Jon A. Kusler and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Wetland Technology written by Guenter Langergraber and published by IWA Publishing. This book was released on 2019-10-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Water quality standards across the world are being re-written to promote healthier ecosystems, ensure safe potable water sources, increased biodiversity, and enhanced ecological functions. Treatment wetlands are used for treating a variety of pollutant waters, including municipal wastewater, agricultural and urban runoff, industrial effluents, and combined sewer overflows, among others. Treatment wetlands are particularly well-suited for sustainable water management because they can cope with variable influent loads, can be constructed of local materials, have low operations and maintenance requirements compared to other treatment technologies, and they can provide additional ecosystem services. The technology has been successfully implemented in both developed and developing countries. The first IWA Scientific and Technical Report (STR) on Wetland Technology was published in 2000. With the exponential development of the technology since then, the generation of a new STR was facilitated by the IWA Task Group on Mainstreaming Wetland Technology. This STR was conceptualized and written by leading experts in the field. The new report presents the latest technology applications within an innovative planning framework of multi-purpose wetland design. It also includes practical design information collected from over twenty years of experience from practitioners and academics, covering experiments at laboratory and pilot-scale up to full-scale applications. Scientific and Technical Report No.27
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1998 with total page 1960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
