Download or read book Temporal Changes in the Soil Pore Size Distribution and Variability of Soil Hydraulic Properties Under Long term Conventional and Conservation Tillage written by Janis Kreiselmeier and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Variability of Soil Hydraulic Properties Subsequent to Tillage written by Ranjith Bandara Mapa and published by . This book was released on 1984 with total page 398 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 1987 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Variability of Soil Hydraulic Properties with Wetting and Drying Subsequent to Tillage written by Ranjith Bandara Mapa and published by . This book was released on 1986 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Principles of Soil Physics written by Rattan Lal and published by CRC Press. This book was released on 2004-05-28 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principles of Soil Physics examines the impact of the physical, mechanical, and hydrological properties and processes of soil on agricultural production, the environment, and sustainable use of natural resources. The text incorporates valuable assessment methods, graphs, problem sets, and tables from recent studies performed around the globe and offers an abundance of tables, photographs, and easy-to-follow equations in every chapter. The book discusses the consequences of soil degradation, such as erosion, inhibited root development, and poor aeration. It begins by defining soil physics, soil mechanics, textural properties, and packing arrangements . The text continues to discuss the theoretical and practical aspects of soil structure and explain the significance and measurement of bulk density, porosity, and compaction. The authors proceed to clarify soil hydrology topics including hydrologic cycle, water movement, infiltration, modeling, soil evaporation, and solute transport processes. They address the impact of soil temperature on crop growth, soil aeration, and the processes that lead to the emission of greenhouse gases. The final chapters examine the physical properties of gravelly soils and water movement in frozen, saline, and water-repellant soils. Reader-friendly and up-to-date, Principles of Soil Physics provides unparalleled coverage of issues related to soil physics, structure, hydrology, aeration, temperature, and analysis and presents practical techniques for maintaining soil quality to ultimately preserve its sustainability.
Download or read book The Dynamic Nature of Transient Macropore Flow in Two Soils Under Conventional and Conservation Tillage written by Christopher Brooks Ogden and published by . This book was released on 1996 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Management on Soil Hydraulic Properties written by Canada-Ontario Soil and Water Environmental Enhancement Program and published by . This book was released on 1990 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Influence of Tillage on Soil Properties Under Agricultural and Natural Prairie Systems written by Juan-Pablo Fuentes and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Temporal Variability of Soil Hydraulic Properties Under Different Soil Management Practices written by Shahid Maqsood Gill and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Variability of Soil Hydraulic Properties and Estimation of Plant available Water on Claypan soil Landscapes written by Pingping Jiang and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil hydraulic properties and plant-available water (PAW) capacity are critical properties in evaluating land management and soil productivity. This study investigated these properties for claypan-soil landscapes in Central Missouri. The objectives were: (1) to evaluate the effects and interactions of conservation management, landscape position and the claypan layer on hydraulic properties including saturated hydraulic conductivity (K [subscript] sat), water retention, pore-size distributions and bulk density; (2) to investigate direct relationships between measured PAW capacity and apparent soil electrical conductivity (EC [subscript] a), and to test the hypothesis that soil PAW capacity can be approximated at a field scale using a theoretical two-layer soil profile, i.e., a silt-loam topsoil layer and a silty-clay subsoil layer; and (3) to evaluate relationships of measured PAW capacity with measured corn grain yield as well as to estimated PAW capacity using a previously-developed Simple Inverse Yield Model (SIYM). Soil series on study sites included Mexico (fine, smectitic, mesic Aeric Vertic Epiaqulfs), Adco (fine, smectitic, mesic Aeric Vertic Albaqualfs), and Leonard (fine, smectitic, mesic, Vertic Epiaqualfs). For objective 1, management treatments were mulch tillage with a corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation (MTCS); no-till with a corn-soybean-wheat (Triticum aestivum L.) rotation (NTCSW) with a red clover (Trifolium pretense L.) cover crop following wheat; a Conservation Reserve Program system (CRP); and a hay crop system . For objective 3, the same two fields were used. Inputs for SIYM simulation were growing season mean maximum and minimum daily air temperature, daily precipitation, hourly vapor pressure deficit, and soil PAW. Nine site-years of corn grain yield data were used to estimate PAW. Results for Objective 1 showed management effects were only statistically evident in the surface 0 to 10-cm depth. The CRP was the best management for the soil properties studied with decreased bulk density, increased K, increased water retention, and increased fraction of larger pores. At the backslope, Kvalues for CRP and HAY were 16 and 10 times higher, respectively, than values for MTCS. The use of perennial grasses in rotation will benefit soil hydraulic properties, particularly at landscape positions most vulnerable to degradation. Results for Objective 2 showed significant relationships between the reciprocal function of EC(HAY). Landscape positions were summit, backslope and footslope. At each combination of management treatment and landscape position, intact soil core samples (76 by 76 mm) were taken from the 0- to 10-, 10- to 20-, and 20- to 30-cm soil depths. For objective 2, soil profile samples were taken at 18 to 19 locations from each of two close-by fields and PAW capacity was determined for a 1.2-m soil profile (PAW1.2). Plant-available water fraction values of 0.23 and 0.12 were used for the topsoil layer (assumed to be silt loam) and subsoil layer (assumed to be silty clay) textures, and the boundary between the two layers was determined by EC [subscript] asatsat [subscript] a (EC [subscript] a−1) and the lower limit of PAW1.2. Relationships between EC [subscript] a−1 and PAW1.2 were also found to be significant with an average regression r2 of 0.76. The two-layer-soil hypothesis was proven to provide reasonably accurate PAW1.2 estimates with root mean square error (RMSE) of 16 mm, compared with the measured PAW1.2. Large underestimates of PAW1.2 were a result of underestimation of topsoil and the SIYM PAW estimates were weak. The rvalues were 0.43 and 0.31 for the two study fields. Claypan soil characteristics (i.e., low hydraulic conductivity, slow recharge, poor drainage, and high soil resistance for water movement to roots) introduced additional yield variability, which SIYM was not designed to handle. The results of this study were useful for designing best management systems and for guiding site-specific management for claypan-soil landscapes thickness, whereas large overestimates were attributed to a few soil horizons at less than field capacity. Soil ECcan be used as a quick and cost-efficient tool to quantify and map PAW capacity for similar soil landscapes. The relationships between the measured PAW [subscript] a1.22.
Download or read book Encyclopedia of Agrophysics written by Jan Gliński and published by Springer Science & Business Media. This book was released on 2011-06-07 with total page 1075 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Encyclopedia of Agrophysics will provide up-to-date information on the physical properties and processes affecting the quality of the environment and plant production. It will be a "first-up" volume which will nicely complement the recently published Encyclopedia of Soil Science, (November 2007) which was published in the same series. In a single authoritative volume a collection of about 250 informative articles and ca 400 glossary terms covering all aspects of agrophysics will be presented. The authors will be renowned specialists in various aspects in agrophysics from a wide variety of countries. Agrophysics is important both for research and practical use not only in agriculture, but also in areas like environmental science, land reclamation, food processing etc. Agrophysics is a relatively new interdisciplinary field closely related to Agrochemistry, Agrobiology, Agroclimatology and Agroecology. Nowadays it has been fully accepted as an agricultural and environmental discipline. As such this Encyclopedia volume will be an indispensable working tool for scientists and practitioners from different disciplines, like agriculture, soil science, geosciences, environmental science, geography, and engineering.
Download or read book Soil Physics written by Manoj K. Shukla and published by CRC Press. This book was released on 2013-11-26 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: Designed for undergraduate and graduate students, this book covers important soil physical properties, critical physical processes involving energy and mass transport, movement and retention of water and solutes through soil profile, soil temperature regimes and aeration, and plant-water relations. It includes new concepts and numerical examples fo
Download or read book Effects of Conservation Tillage on Soil Hydraulic Properties Including Rain Generated Wetting Front Migration written by Benjamin C. Datiri and published by . This book was released on 1989 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Structural Form and Stability Induced by Tillage in a Typic Hapludalf written by Dalvan Jose Reinert and published by . This book was released on 1990 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soils and Fertilizers written by and published by . This book was released on 1996-07 with total page 1066 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Quality for Crop Production and Ecosystem Health written by E.G. Gregorich and published by Elsevier. This book was released on 1997-11-10 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil is a complex body that exists as many types, each with diverse properties that may vary widely across time and space as a function of many factors. This complexity makes the evaluation of soil quality much more challenging than that of water or air quality. Evaluation of soil quality now considers environmental implications as well as economic productivity, seeking to be more holistic in its approach.Thus, soil quality research draws from a wide range of disciplines, blending the approaches of biologists, physicists, chemists, ecologists, economists and agronomists, among others.This book presents a broad perspective of soil quality that includes these various perspectives and gives a strong theoretical basis for the assessment of soil quality.A short glossary provides definitions for terms used throughout the book.
