This book provides readers the basic principles of water and solute transport through vadose zone, the theory behind transport, and step-by-step guidance on how to use current computer models in the public domain. The new edition features one new chapter, highlights new problems, and new computer models.

1. Introduction to Soil Physics 2. Units and Dimensions 3. Characteristics of Soils of the Vadose Zone 4. Sampling Concepts and Designs 5. Spatial Variability of Vadose Zone Properties 6. Fundamentals of Hydrology 7. Properties of Water 8. Water in the Vadose Zone 9. Flow through the Vadose Zone 10. Water Infiltration into the Vadose Zone 11. Energy Flow through the Vadose Zone 12. Evaporation from Soil 13. Root Water Uptake 14. Airflow through the Vadose Zone 15. Chemical Transport through the Vadose Zone 16. Modeling Flow through the Vadose Zone Using the HYDRIS-1D Model 17. Flow through the Vadose Zone Using RZWQM 18. Special Topics: Soil Erosion, Contaminant Remediation and Salt Removal

Dr. Manoj K. Shukla is an professor of environmental soil physics at New Mexico State University, Las Cruces, New Mexico. He also holds the Nakayama Research Excellence Professorship. At NMSU, he also serves as a Director Global Program of College of Agricultural, Consumer and Environmental Sciences, New Mexico State University. He has held faculty positions at various universities in India and has served as a research scientist at the University of Agricultural Sciences, Vienna, as a postdoctoral research associate at the University of Illinois, and as a research scientist at Ohio State University. He received his PhD in soil physics from the University of Agricultural Sciences, Vienna, Austria, in a collaborative program with the University of California, Davis, his master's degree in soil and water engineering from the Water and Land Management Institute, India, and his bachelor's degree in agricultural engineering from the National Institute of Hydrology, India. Dr. Shukla is a recipient of the Patricia Christmore Faculty Teaching Award, the North American Colleges and Teachers of Agriculture Teaching Award of Merit, RGBI Integrated Program Team Award, and an award of excellence for outstanding contribution to two Western Regional Multistate Research. He also served as the executive board member for International Arid Lands Consortium and BHC expert panel member. He is a member APLU and a visiting Professor to China Agricultural University. Dr. Shukla is a Fellow of Soil Science Society of America.

Dr. Shukla serves as the technical editor of Soil Physics and Hydrology section of Soil Science Society of America. He also serves as the Consulting editor of Vadose Zone Journal. He has served as the Editor- Book Review for Vadose Zone Journal and editorial board member of NACTA (North American Colleges & Teachers of Agriculture) Journal. He was the Chair of mentoring committee of Soil Physics and Hydrology division in 2022, and member of L.R. Ahuja systems modeling award committee of the SSSA and unsaturated zone technical committee of American geophysical Union. He has previously served as a secretary of the regional coordination committee and as a presiding officer and convener at several international meetings. He is a member of many professional societies, including AGU, SSSA, and ASABE. Dr. Shukla teaches environmental soil physics and advanced soil physics regularly, as well as contaminant transport modeling, spatial variability analysis, and introductory soils on occasion. He has helped more than 35 students graduate with a master's degree or a PhD as Chair of their committees. His research interests are related to soil physics, spatial and temporal variability of soil properties, and water and solute transport under different land use and management systems at multiple scales. Recently, he has worked on reuse of brackish and produced waters for ensuring food security and human sustainability. He has received over $25 million as research funding from various agencies. He has coauthored a textbook, Principles of Soil Physics, edited a book, Soil Hydrology, Land Use and Management: Measurement and Modeling, and has coauthored 154 peer-reviewed journal articles and several research reports, book chapters, and proceedings papers.