Download or read book Spatial Models of Water Use in California Rice Production written by Margaret Mary Hauselt and published by . This book was released on 2007 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Data Analysis in Ecology and Agriculture Using R written by Richard E. Plant and published by CRC Press. This book was released on 2012-03-07 with total page 651 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assuming no prior knowledge of R, Spatial Data Analysis in Ecology and Agriculture Using R provides practical instruction on the use of the R programming language to analyze spatial data arising from research in ecology and agriculture. Written in terms of four data sets easily accessible online, this book guides the reader through the analysis of each data set, including setting research objectives, designing the sampling plan, data quality control, exploratory and confirmatory data analysis, and drawing scientific conclusions. Based on the author’s spatial data analysis course at the University of California, Davis, the book is intended for classroom use or self-study by graduate students and researchers in ecology, geography, and agricultural science with an interest in the analysis of spatial data.
Download or read book Issues in Earth Sciences Geology and Geophysics 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 4306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about Earth Sciences, Geology, and Geophysics. The editors have built Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about Earth Sciences, Geology, and Geophysics in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in Earth Sciences, Geology, and Geophysics: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 732 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 1991 with total page 882 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Factors Underlying Grain Yield Spatiotemporal Variability in California Rice Fields written by Alvaro Roel Dellazoppa and published by . This book was released on 2003 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Central Valley of California written by United States. Water Resources Policy Commission and published by . This book was released on 1951 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial Variability of Rice at the Field Scale in the Sacramento Valley California written by Claudia Marchesi and published by . This book was released on 2006 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Water Management for Improved Agronomic and Environmental Performance in California Rice written by Gabriel Thomas La Hue and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Rice (Oryza sativa L.) is critically important for global food security and is a major crop in California, yet it has considerable water and carbon footprints. Alternative water management techniques, such as alternate wetting and drying (AWD), represent one of the most promising opportunities for reducing irrigation requirements and greenhouse gas (GHG) emissions from rice fields. A three-year field experiment was conducted to evaluate AWD for California rice production, specifically focusing on methane (CH4) and nitrous oxide (N2O) emissions, rice grain total arsenic (As) concentrations, yield response to nitrogen (N) rate, and rice grain yield. Grain yields (average = 10 Mg ha−1) were similar or higher with AWD compared to the control and required similar or lower N rates to achieve these yields. Furthermore, AWD reduced the annual global warming potential (GWP) by 57–74% and milled grain total As by 59–65% in the AWD treatments. These results show that AWD has the potential to mitigate GHG emissions and reduce rice grain total As concentrations without sacrificing grain yield, but the potential impact on irrigation water requirements is unclear due to a limited understanding of subsurface water flows (percolation and lateral seepage) in California rice fields, the reduction of which is expected to be responsible for any reduction in irrigation water requirements. To that end, percolation was directly measured in eight rice fields, lateral seepage was measured in six rice fields, and a complete water balance was developed for three rice fields. Lateral seepage rates varied over four orders of magnitude (0.05–33.11 cm2 hr−1 or 0.0011–1.05 cm hr−1), though even the highest rate measured was small compared to typical water inputs in California rice fields. Cumulative percolation over the growing season ranged from 0.04 to 6.95 cm season−1. Combined percolation and lateral seepage calculated as the residual term of a water balance for three fields was 17.1 cm, compared to 4.4 cm based on direct measurements, corresponding to 13.2% and 3.4% of water inputs, respectively. No relationship between percolation or lateral seepage rates and soil properties was observed. Future research should examine the contribution of preferential flow pathways to the rice field water balance and focus on adapting AWD to the scale of commercial rice production in California.
Download or read book Water Management in Rice Production written by Dwight C. Finfrock and published by . This book was released on 1960 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spatial and Temporal Salinity Dynamics in Flooded Rice Fields written by Mathias Marcos and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The scarcity of high quality irrigation water is a global issue facing rice growers, forcing many to adopt water management systems that may result in increased salinity and yield reductions. While salt concentrations in field water have been shown to vary depending on water management, the distribution and build-up patterns of dissolved salts are unclear. This study was conducted to elucidate the within field spatial and temporal salinity dynamics in flooded rice cropping systems, and to assess current salinity thresholds for rice yield reduction. In this two-year study, water and soil salinity concentrations of eleven field sites were monitored weekly, with three sampling points being established in the top, middle and bottom basins of each field. There was a consistent spatio-temporal water salinity pattern among all fields: the maximum water salinity within a field occurred during week 2 to week 7 after planting, ranged from 0.36 to 6.06 dS m−1, and was greatest farther from the irrigation inlet and where soil salinity was high. A model developed to predict water salinity within a field indicates that, averaged over an entire growing season, the position within a field contributed to 78% of the variation explained by the model, while preseason soil salinity contributed to 22%. Preseason soil salinity was a poor predictor of yield loss; however, season-average water salinity above 0.88 dS m−1 was negatively correlated with yield. These results illustrate the ability to predict water salinity in a rice field with few parameters, while highlighting the importance of field water salinity as the main salinity metric for rice cropping systems.
Download or read book Water Use for Rice Farming in California written by CH2M HILL (Firm) and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Issues in the Impacts of Climate Variability and Change on Agriculture written by Linda O. Mearns and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a collection of articles concerning key topics which examine the impacts of climate change and variability on agriculture. The application region is the southeastern United States. The main topics include an investigation of the effect of variations in the spatial scale of climate change scenarios on an agricultural integrated assessment, methods of simulating adaptations of climate change, and the relationship between large scale climate variability and local climate and vegetation. This book will be very useful for researchers and policy makers involved in climate change impacts.
Download or read book Rice in California written by Jack H. Willson and published by . This book was released on 1979 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: World rice production; Rice in California; Rice experiment station; The California rice research board; Evolution of California rice culture; Irrigation; Drainage; Rice harvesting; Rice drying and storage; Rice milling; Rice marketing; Economics; Rice program under U.S.D.A.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1194 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Based Remote Sensing for Agricultural Applications written by Evelyn A. Brownlee and published by . This book was released on 1993 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
