> For the complete documentation index, see [llms.txt](https://2024.istvs.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://2024.istvs.org/submissions/papers/4142.md). # 4142 / Root System Analysis After Vibratory Roller Compaction In Dry Direct Seeding Of Rice Field ## Authors Koichiro Fukami, Naoki Matsuo, Keiko Nakano, and Kimiyasu Takahashi {% hint style="info" %} Paper presented at ISTVS 2024 | 21st International and 12th Asia-Pacific Regional Conference of the ISTVS\ Keywords: dry direct seeding of rice; vibrating roller; prevent water leakage; root system analysis\ {% endhint %} ## Abstract To improve the efficiency and optimization of compaction work using a vibratory roller to prevent water leakage in dry rice direct seeding fields, we investigated how the number of compaction passes affects soil physical properties (hardness and permeability), crop growth, and root system development. Cultivation tests showed that compaction operations effectively prevent leakage and increase the number of seedlings. We analyzed its effect on 3D X-ray CT image-confirmed vertical root elongation under all conditions. In addition, we qualitatively confirmed that the roots tended to become thinner when the number of compactions was 5 compared to other conditions. Additionally, WinRHIZO analysis revealed the following: the root dry weight per number of stems decreased with 1- and 3-pass compaction and increased with 5-pass compaction, compared to uncompacted soil. The total root length per the stems decreased after 1- and 3-pass compaction and increased after 5 passes of compaction. The composition of roots with a diameter of 0.38 mm, or more, increased after 1 and 3 compactions and decreased after 5 compactions. In addition, the composition of roots with a diameter of 0.28 mm or less increased after 5 passes of compaction. The above suggested that excessive compaction may have a negative effect on the root system of paddy rice (roots become thinner). *** Full paper purchase: \ ISTVS members receive three complimentary papers per year: --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://2024.istvs.org/submissions/papers/4142.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.