Root Scans to Document Fertilizer Response

This rhizotron project to monitor root growth in soil was initiated with two objectives. The first was to develop educational tools with in situ demonstrations of root growth as influenced by nutrients. The second objective was to create still images and videos of root growth that could be posted on the internet. Root systems of growing plants are observed with a flat-bed scanner buried in the soil as part of a laboratory experience for a crop physiology class. The rhizotrons have also been used to conduct undergraduate research projects.

Student’s involvement in the project has been important to its success. In the class, the students design independent research projects with various crops (alfalfa, wheat, barley, corn, soybeans, and potatoes), and fertilizer treatments (rate, placement, and nutrient source). Students have posted root images and videos on websites such as Facebook and YouTube. The rhizotron has been an excellent teaching tool and has facilitated students’ understanding of root growth and fertilizer response. For example, one student used the rhizotrons to observe alfalfa nodulation as influenced by different fertilizers. The research was presented at the 2011 American Society of Agronomy meetings and helped him decide to pursue a graduate degree.

Funds from IPNI are used to purchase and maintain the equipment. Equipment requirements include a computer for image processing, 15 flat-bed scanners that are used to observe roots, and other items for building the rhizotron. As part of the project, two students have been employed to manage the project and produce videos and images. This project will produce educational tools that illustrate root growth and demonstrate techniques that can be adopted by other educators to illustrate root and nutrient interactions. ID-11