Download or read book Spatial Variability of Field measured Soil water Properties written by Donald R. Nielsen and published by . This book was released on 1973 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Characterization and Prediction of Spatial Variability of Unsaturated Hydraulic Properties in a Field Soil written by and published by . This book was released on 1991 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A 91-m transect was set up in an irrigated field near Las Cruces, New Mexico to investigate the spatial variability of unsaturated soil properties. A total of 455 sampling points were monitored along a grid consisting of 91 stations placed 1 m apart by 5 depths per station. Post-irrigation soil water tension and water content measurements were recorded over 45 days at 11 time periods. The instantaneous profile was used to estimate the unsaturated hydraulic conductivity at the 455 sampling points. Fifty soil samples were also taken for analyzing sand, silt, and clay content distributions. The spatial and temporal variability of soil water tension and water content were investigated along with the spatial variability of parameters of an unsaturated hydraulic conductivity model. Results of the analysis show that spatial variation in soil water tension and water content is consistent with the soil texture spatial variability. In addition, the spatial distribution of the estimated parameter value of unsaturated hydraulic conductivity reflects the soil texture distribution. Using the statistics of the estimated hydraulic parameter values, a stochastic soil water tension model was employed to reproduce the variability of observed soil water tension. Although many assumptions were made, the results of the simulation appear promising.
Download or read book Nitrates agriculture eau written by R. Calvet and published by Editions Quae. This book was released on 1990 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: The contributions of this symposium on the relation agriculture-nitrogen-water deal with the economical aspects (cost evaluation and cost repartition), the quantitative approach of the nitrogen biochemical cycle, farming systems and nitrogen manegement, and land utilization, nitrogen management and water quality
Download or read book Spatial Variability of Dielectric Properties in Field Soils written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most mine detection sensors are affected by soil properties such as water content, temperature, electrical conductivity, and dielectric constant The most important of these is water content since it directly influences the three other properties The variability of these properties may be such that either potential land mine signatures are overshadowed or false alarms result In this paper we present the results of field measurements in the Netherlands, Panama, and New Mexico on spatial variability of soil water content We also discuss how the variability of soil water content affects the soils electrical conductivity and dielectric constant and the resulting response of a ground penetrating radar system.
Download or read book Soil Water Measurement written by J. David Cooper and published by John Wiley & Sons. This book was released on 2016-01-19 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is written for all those involved in measurement of soil water phenomena, whether they be environmental scientists, field technicians, agronomists, meteorologists, hydrogeologists, foresters, physical geographers, civil or water engineers or students in these subjects. It contains a comprehensive description of all the major methods used for measurement of soil water content and potential, solute concentration, transport and balance of water and solutes, including recharge to groundwater aquifers. The emphasis is firmly on techniques which can be applied in the field or on samples obtained from the field. The theory and practice of the workings of the main instruments and methods available is described, along with practical tips on surmounting some of the main difficulties and explanations of many commonly encountered jargon words.
Download or read book Assessing and Modeling the Spatial Variability of Soil Water Redistribution and Wheat Yield Along a Sloping Landscape written by Ayman Abdallah Ahmed Suleiman and published by . This book was released on 1999 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Book for Describing and Sampling Soils written by Philip J. Schoeneberger and published by Government Printing Office. This book was released on 2012 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOTE: NO FURTHER DISCOUNT FOR THIS PRINT PRODUCT-- OVERSTOCK SALE -- Significantly reduced list price USDA-NRCS. Issued in spiral ringboundbinder. By Philip J. Schoeneberger, et al. Summarizes and updates the current National Cooperative SoilSurvey conventions for describing soils. Intended to be both currentand usable by the entire soil science community."
Download or read book Soil Spatial Variability written by Donald R. Nielsen and published by Bernan Press(PA). This book was released on 1985 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISSS congress geostatistics
Download or read book Applications of Soil Physics written by Daniel Hillel and published by Elsevier. This book was released on 2012-12-02 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of Soil Physics deals with the applications of soil physics and covers topics ranging from infiltration and surface runoff to groundwater drainage, evaporation from bare-surface soils, and uptake of soil moisture by plants. Water balance and energy balance in the field are also discussed, along with tillage and soil structure management. The development and extension of Penman's evaporation formula is also described. This book is comprised of 14 chapters and begins with a systematic description of the field-water cycle and its management, with emphasis on infiltration and runoff; redistribution and drainage; evaporation and transpiration; and irrigation and tillage. Subsequent chapters focus on transpiration from plant canopies; freezing phenomena in soils; scaling and similitude of soil-water phenomena; spatial variability of soil physical properties; and movement of solutes during infiltration into homogeneous soil. Concepts of soil-water availability to plants are considered, together with principles of irrigation management and the advantages and limitations of drip irrigation. This monograph is intended for upper-level undergraduate and graduate students of the environmental, engineering, and agronomic sciences.
Download or read book Measurement of Temporal and Spatial Variability of Soil water in a Grass Meadow written by Christopher Warren McVoy and published by . This book was released on 1994 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Scale Water and Solute Flux in Soils written by Roth and published by Birkhäuser. This book was released on 2012-12-06 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the first workshop held at Monte Verità near Ascona, Switzerland on September 24-29, 1989. The workshop was designed to survey the current understanding of water and solute transport through unsaturated soils under field conditions, and to foster research by discussing some unresolved key issues relative to transport modeling and experimentation in four "Think Tank" groups. The first part of this book consists of the reports prepared by the Think Tank groups, who discussed the following topics: modeling approaches, effective large scale properties, evaluation of filed properties, and the role preferential flow. The second part contains a selection of reviewed original contributions presented at the workshop, with topics ranging from the presentation of results from large scale experiments, to improved or new modeling approaches, and to legal or policy aspects. This book is intended for researchers in soil science, hydrology, and environmental engineering who have an interest in transport and reaction processes in the unsaturated zone. It will provide them with a representative sample of current research activities, and with a group discussion of future research directions in four important areas of water and solute transport.
Download or read book Proceedings of GeoShanghai 2018 International Conference Multi physics Processes in Soil Mechanics and Advances in Geotechnical Testing written by Liangbo Hu and published by Springer. This book was released on 2018-05-03 with total page 547 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the second volume of the proceedings of the 4th GeoShanghai International Conference that was held on May 27 - 30, 2018. This conference showcased the recent advances and technology in geotechnical engineering, geoenvironmental engineering and transportation engineering. This volume, entitled “Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing”, covers a wide range of topics in soil mechanics, focusing on the behaviours of partially saturated soils, combined effects of multi-physics processes in geological materials and systems, and emerging methods and techniques in geotechnical in-situ testing and monitoring. This book may benefit researchers and scientists from the academic fields of soil and rock mechanics, geotechnical engineering, geoenvironmental engineering, transportation engineering, geology, mining and energy, as well as practical engineers from the industry. Each of the papers included in this book received at least two positive peer reviews. The editors would like to express their sincerest appreciation to all of the anonymous reviewers all over the world, for their diligent work.
Download or read book Spatial Variability of Two Different Soil Moisture Regimes written by Charles P. Maule and published by . This book was released on 1984 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimization of land management for water conservation, soil salinity and erosion control requires a through understanding of the soil water balance. The adequate design of any water balance study requires that the precision and the spatial variability of the soil parameters be known. The objectives of this study were to quantify the soil water balance components and to determine the precision and spatial variability of soil moisture and related soil properties. The study was conducted during 1983 at the Ellerslie Research Station near Edmonton, Alberta. Soil moisture was measured with a neutron probe at 42 locations, 6.1 m apart, arranged in a six by seven grid. Fallow plots were alternated with barley plots resulting in three replicates of each. Particle size analysis, bulk density, and the moisture characteristic curve were determined at several depths at each location. Due to dry conditions in May and June the barley did not germinate until late June. Heavy rains during late June and early July resulted in near saturated conditions and in a perched water table within 1 m of the surface. Dry, warm weather for the remainder of the growing season resulted in vigorous barley growth. Precipitation for the study period was 284 mm. The total change in soil moisture for the top 1 m of the soil profile was -17 mm and -64 mm for the fallow and barley plots respectively. Evapotranspiration, determined in part from the Penman method and from the field capacity method, was 207 mm and 254 mm for the fallow and the barley plots respectively. Drainage was determined to be 94 mm for both fallow and barley plots. As it was not possible to separate deep drainage from upward flow, the contribution of the water table to evapotranspiration could not be evaluated. An alternate method for evaluating drainage and evapotranspirat ion of the barley plots, the gradient method, yielded only a 2% difference in evapotranspiration from the field capacity method. Discontinuous sand lenses below 60 cm resulted in highly skewed distributions of the particle size, the characteristic curve, and the moisture content during dry conditions. During the near saturated conditions of the heavy rainfalls the skewed moisture conditions normalized. This resulted in soil moisture sample size requirements of 4 to over 20 for a precision of ±5%. Semivariograms of soil moisture and related soil properties showed general spatial independence for distances from 6.1 to 37 m. Spatial dependence could exist at distances less than or greater than those measured. An adequate sampling program for the determination of soil moisture for this site, which is approximately 0.1 ha in area, would require at least 10 to 15 access tubes arranged between 6 and 37 m apart to achieve a precision of ± 5%. For these distances systematic sampling does not offer any increase in precision over random sampling.
Download or read book Spatial Variability of Water Related Soil Physical Properties written by Mardonio Aguiar Coelho and published by . This book was released on 1974 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Temporal Spatial Variability of Soil Water written by C.W. McVoy and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Science written by Sally D. Logsdon and published by ASA-CSSA-SSSA. This book was released on 2008 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
