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Author : Velupillai Rasiah
Publisher :
ISBN 13 :
Total Pages : 182 pages
Book Rating : 4.:/5 (178 download)
Download or read book Modeling of Soil Water Flow and Root Uptake written by Velupillai Rasiah and published by . This book was released on 1986 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. DeJong
Publisher : Research Branch, Agriculture Canada
ISBN 13 :
Total Pages : 46 pages
Book Rating : 4.3/5 (121 download)
Download or read book Soil Water Models written by R. DeJong and published by Research Branch, Agriculture Canada. This book was released on 1984 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. A. Feddes
Publisher : Halsted Press
ISBN 13 : 9780470264638
Total Pages : 188 pages
Book Rating : 4.2/5 (646 download)
Download or read book Simulation of Field Water Use and Crop Yield written by R. A. Feddes and published by Halsted Press. This book was released on 1978-01-01 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory of field water use: basics of water flow i unsaturated soils;water uptake by plants roots;numerical approximation of flow in soil-root systems. Theory of crop production:mathematical description of growts;water and actual production;calculation of potential production. Theprogram:program for field water use, SWATR;program for crop production,CROPR;execution of SWATR; execution of CROPR.
Author : H. N. Hayhoe
Publisher : Agriculture Canada, Research Branch
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (319 download)
Download or read book Computer Simulation Model of Soil Water Movement and Uptake by Plant Roots written by H. N. Hayhoe and published by Agriculture Canada, Research Branch. This book was released on 1982 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christopher Boon Sung Teh
Publisher :
ISBN 13 : 9789673447626
Total Pages : 154 pages
Book Rating : 4.4/5 (476 download)
Download or read book Modeling Soil Water Flow in Python and Excel written by Christopher Boon Sung Teh and published by . This book was released on 2017 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gordon Bonan
Publisher : Cambridge University Press
ISBN 13 : 1107043786
Total Pages : 459 pages
Book Rating : 4.1/5 (7 download)
Download or read book Climate Change and Terrestrial Ecosystem Modeling written by Gordon Bonan and published by Cambridge University Press. This book was released on 2019-02-21 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an essential introduction to modeling terrestrial ecosystems in Earth system models for graduate students and researchers.
Author : Francis Robert Bidinger
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.E/5 ( download)
Download or read book Drought Research Priorities for the Dryland Tropics written by Francis Robert Bidinger and published by . This book was released on 1988 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defining the problem: translating climatic data in to moisture availability patterns usable in drought research. making the best use of available technology: fitting cropping systems, crops, and crop varieties to the environment. possibilities for modifying crop and soil management practices to maximize production per unit rainfall. Possibilities for modifying crop varieties to increase production per unit rainfall.
Author : Balram Panigrahi
Publisher : CRC Press
ISBN 13 : 1771883278
Total Pages : 375 pages
Book Rating : 4.7/5 (718 download)
Download or read book Modeling Methods and Practices in Soil and Water Engineering written by Balram Panigrahi and published by CRC Press. This book was released on 2017-03-16 with total page 375 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses the development of useful models and their applications in soil and water engineering. It covers various modeling methods, including groundwater recharge estimation, rainfall-runoff modeling using artificial neural networks, development and application of a water balance model and a HYDRUS-2D model for cropped fields, a multi-model approach for stream flow simulation, multi-criteria analysis for construction of groundwater structures in hard rock terrains, hydrologic modeling of watersheds using remote sensing, and GIS and AGNPS.
Author : Lajpat Ahuja
Publisher : Water Resources Publication
ISBN 13 : 9781887201087
Total Pages : 388 pages
Book Rating : 4.2/5 (1 download)
Download or read book Root Zone Water Quality Model written by Lajpat Ahuja and published by Water Resources Publication. This book was released on 2000 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication comes with computer software and presents a comprehensive simulation model designed to predict the hydrologic response, including potential for surface and groundwater contamination, of alternative crop-management systems. It simulates crop development and the movement of water, nutrients and pesticides over and through the root zone for a representative unit area of an agricultural field over multiple years. The model allows simulation of a wide spectrum of management practices and scenarios with special features such as the rapid transport of surface-applied chemicals through macropores to deeper depths and the preferential transport of chemicals within the soil matrix via mobile-immobile zones. The transfer of surface-applied chemicals (pesticides in particular) to runoff water is also an important component.
Author : M.B. Kirkham
Publisher : Academic Press
ISBN 13 : 0124200788
Total Pages : 599 pages
Book Rating : 4.1/5 (242 download)
Download or read book Principles of Soil and Plant Water Relations written by M.B. Kirkham and published by Academic Press. This book was released on 2014-04-21 with total page 599 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles of Soil and Plant Water Relations, 2e describes the principles of water relations within soils, followed by the uptake of water and its subsequent movement throughout and from the plant body. This is presented as a progressive series of physical and biological interrelations, even though each topic is treated in detail on its own. The book also describes equipment used to measure water in the soil-plant-atmosphere system. At the end of each chapter is a biography of a scientist whose principles are discussed in the chapter. In addition to new information on the concept of celestial time, this new edition also includes new chapters on methods to determine sap flow in plants dual-probe heat-pulse technique to monitor water in the root zone. Provides the necessary understanding to address advancing problems in water availability for meeting ecological requirements at local, regional and global scales Covers plant anatomy: an essential component to understanding soil and plant water relations
Author : Parikshit Verma
Publisher :
ISBN 13 :
Total Pages : 234 pages
Book Rating : 4.:/5 (11 download)
Download or read book Modeling Root Water Uptake written by Parikshit Verma and published by . This book was released on 2013 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Root water uptake by plants mediates the exchange of water, carbon and energy between land surface and atmosphere and is important in hydrological, climatological, agricultural and ecological studies. Field measurements show that root water uptake could be significantly affected by root water compensation and hydraulic redistribution. We thus use a root water uptake model able to describe these two mechanisms and show their importance when vegetation is growing in shallow water-table environments or duplex soils. The model is based on the Richards equation for the water-flow in soils, with a term for root water uptake being a function of the water potential difference between root xylem and the soil. We describe the flow in the xylem using the Darcy's equation.The model is used in three studies aimed at highlighting the role that root water compensation and hydraulic redistribution might have on the overall root water uptake. In the first study, the model in one dimension is applied to a site near Sydney, Australia, to investigate how native trees growing on duplex soils are able to sustain transpiration rate despite long periods with little or no rain. The model was able to reproduce sap-flux data and the pattern of soil, root and leaf water potential for several months. Scenarios with different root depths showed that trees were able to adjust their water-uptake rates from different soil layers based on soil moisture availability; thus, root water compensation appears to be a key mechanism to maintain sustained transpiration rates. In a second study we investigated the contribution of root water compensation and hydraulic redistribution to root water uptake in shallow water-table environments. We compared the results of our model with a more commonly used root water uptake model. In the third study, we extended the 1D-model to two dimensions, thereby being able to simulate horizontal hydraulic redistribution and the interaction between species with different root systems. In the 2D-model, the roots were assumed to be a continuum in soil and the root systems were described in terms of xylem conductivity fields. Scenarios are presented to show that the 2D-model is able to reproduce observed flow patterns through roots in parts of the soil with different degrees of moisture. The studies presented in this thesis show the further development and use of a modeling approach that is gaining increasing interest in the recent literature. These studies present a realistic description of the role that root water compensation and hydraulic redistribution play in plant water use. The 2D-model introduces a representation of the root system that allows for modelling vertical (hydraulic lift) and horizontal hydraulic redistribution of water in soil, and an efficient description of the interaction between species with different root systems.
Author : National Research Council
Publisher : National Academies Press
ISBN 13 : 0309170990
Total Pages : 398 pages
Book Rating : 4.3/5 (91 download)
Download or read book Conceptual Models of Flow and Transport in the Fractured Vadose Zone written by National Research Council and published by National Academies Press. This book was released on 2001-05-21 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid flow and solute transport within the vadose zone, the unsaturated zone between the land surface and the water table, can be the cause of expanded plumes arising from localized contaminant sources. An understanding of vadose zone processes is, therefore, an essential prerequisite for cost-effective contaminant remediation efforts. In addition, because such features are potential avenues for rapid transport of chemicals from contamination sources to the water table, the presence of fractures and other channel-like openings in the vadose zone poses a particularly significant problem, Conceptual Models of Flow and Transport in the Fractured Vadose Zone is based on the work of a panel established under the auspices of the U.S. National Committee for Rock Mechanics. It emphasizes the importance of conceptual models and goes on to review the conceptual model development, testing, and refinement processes. The book examines fluid flow and transport mechanisms, noting the difficulty of modeling solute transport, and identifies geochemical and environmental tracer data as important components of the modeling process. Finally, the book recommends several areas for continued research.
Author : Howard M. Taylor
Publisher :
ISBN 13 :
Total Pages : 568 pages
Book Rating : 4.:/5 (89 download)
Download or read book Limitations to Efficient Water Use in Crop Production written by Howard M. Taylor and published by . This book was released on 1983 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Marco Bittelli
Publisher :
ISBN 13 : 0199683093
Total Pages : 461 pages
Book Rating : 4.1/5 (996 download)
Download or read book Soil Physics with Python written by Marco Bittelli and published by . This book was released on 2015 with total page 461 pages. Available in PDF, EPUB and Kindle. Book excerpt: This innovative study presents concepts and problems in soil physics, and provides solutions using original computer programs. It provides a close examination of physical environments of soil, including an analysis of the movement of heat, water and gases. The authors employ the programminglanguage Python, which is now widely used for numerical problem solving in the sciences. In contrast to the majority of the literature on soil physics, this text focuses on solving, not deriving, differential equations for transport. Using numerical procedures to solve differential equations allowsthe solution of quite difficult problems with fairly simple mathematical tools. Numerical methods convert differential into algebraic equations, which can be solved using conventional methods of linear algebra. Each chapter introduces a soil physics concept, and proceeds to develop computer programsto solve the equations and illustrate the points made in the discussion.Problems at the end of each chapter help the reader practise using the concepts introduced. The text is suitable for advanced undergraduates, graduates and researchers of soil physics. It employs an open source philosophy where computer code is presented, explained and discussed, and provides thereader with a full understanding of the solutions. Once mastered, the code can be adapted and expanded for the user's own models, fostering further developments. The Python tools provide a simple syntax, Object Oriented Programming techniques, powerful mathematical and numerical tools, and a userfriendly environment.
Author : Jacob H. Dane
Publisher : John Wiley & Sons
ISBN 13 : 089118841X
Total Pages : 1744 pages
Book Rating : 4.8/5 (911 download)
Download or read book Methods of Soil Analysis, Part 4 written by Jacob H. Dane and published by John Wiley & Sons. This book was released on 2020-05-27 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt: The best single reference for both the theory and practice of soil physical measurements, Methods, Part 4 adopts a more hierarchical approach to allow readers to easily find their specific topic or measurement of interest. As such it is divided into eight main chapters on soil sampling and statistics, the solid, solution, and gas phases, soil heat, solute transport, multi-fluid flow, and erosion. More than 100 world experts contribute detailed sections.
Author : G.Y. Tsuji
Publisher : Springer Science & Business Media
ISBN 13 : 9401736243
Total Pages : 405 pages
Book Rating : 4.4/5 (17 download)
Download or read book Understanding Options for Agricultural Production written by G.Y. Tsuji and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first premise of this book is that farmers need access to options for improving their situation. In agricultural terms, these options might be manage ment alternatives or different crops to grow, that can stabilize or increase household income, that reduce soil degradation and dependence on off-farm inputs, or that exploit local market opportunities. Farmers need a facilitating environment, in which affordable credit is available if needed, in which policies are conducive to judicious management of natural resources, and in which costs and prices of production are stable. Another key ingredient of this facilitating environment is information: an understanding of which options are viable, how these operate at the farm level, and what their impact may be on the things that farmers perceive as being important. The second premise is that systems analysis and simulation have an impor tant role to play in fostering this understanding of options, traditional field experimentation being time-consuming and costly. This book summarizes the activities of the International Benchmark Sites Network for Agrotechnology Transfer (IBSNAT) project, an international initiative funded by the United States Agency for International Development (USAID). IBSNAT was an attempt to demonstrate the effectiveness of understanding options through systems analysis and simulation for the ultimate benefit of farm households in the tropics and subtropics. The idea for the book was first suggested at one of the last IBSNAT group meetings held at the University of Hawaii in 1993.
Author : Tom Schröder
Publisher : Forschungszentrum Jülich
ISBN 13 : 3893365761
Total Pages : 89 pages
Book Rating : 4.8/5 (933 download)
Download or read book Three-dimensional Modelling of Soil-plant Interactions written by Tom Schröder and published by Forschungszentrum Jülich. This book was released on 2009 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt:
