![enter image description here][1] Version: 9 Date: January 11, 2025 **Summary of Changes from v8 (2024) to v9 (2025)** * Added links to audio overviews for Chapters 2-13. These overviews were generated by Dr. Briana Wyatt using artificial intelligence through Google’s NotebookLM tool. * Updated global precipitation figure and atmospheric water vapor figure in Chapter 5. * Added link to new videos on rainfall interception and soil splash in Chapter 5. * Minor corrections to figure order and numbering. * Minor grammatical corrections. * Fixed or removed several broken links. **Summary of Changes from v7 (2023) to v8 (2024)** * Expansion of introduction in Ch. 1 * New map and discussion of global cropland areas added to Ch. 2 * New soil moisture time lapse video added to Section 3.1.2 * New video added to help with soil water retention calculation in Ch. 3 problem set * New video of soil swelling added to Section 4.6 * Changes made to simplify/clarify problems 3 and 4 in Ch. 4 problem set * New video demonstrating soil water balance calculations added to Ch. 5 problem set * New video demonstrating Green-Ampt infiltration calculations added to Ch. 6 problem set * Switched WEPP runoff and erosion problem in Ch. 7 to use WEPPcloud * New “fly-through” video of pore scale solute transport added to Ch. 9 introduction * New video on hydrodynamic dispersion added to Section 9.1.3 * Change to soil textural class in problem 1 of Ch. 10 problem set * Replaced “stomates” with “stomata” throughout Ch. 11 * New video of stoma opening and closing added to Section 11.1 * Added information on water vapor feedback effect in Section 12.4 **Acknowledgements** The development of this textbook was supported in part by the Wise Oklahoma State University Library Open Textbook Initiative and the Oklahoma State Regents for Higher Education Open Educational Resources grant program. The first version of the textbook was begun during the author’s sabbatical at China Agricultural University in 2016, hosted by Dr. Tusheng Ren. Valuable contributions to this book have been made by Dr. Briana Wyatt, Dr. Jingnuo Dong, and other students and colleagues. Cover Image: Rain and shine near Chilcott, Somerset, UK. Photo by Edmund Shaw. Licensed for reuse CC BY-SA 2.0. [1]: https://www.geograph.org.uk/reuse.php?id=4385784&download=8524d987&size=original