Root Engineering for Self-Irrigation that Exploits Soil Depth Dimension for Carbon Sequestration

65456 This project will develop the information required to promote tree planting systems that encourage deep rooting, thus enhancing carbon sequestration and providing other benefits to the environment. Phase I collected root mass data (and thus carbon) in the subsoil of 3 to 10 year old trees to determine both the validity of the approach of deep rooting technology and potential carbon gains from that technology. Studies were conducted on how to adapt existing deep rooting technology to minimize installation costs and improve deep rooting efficacy to enhance carbon sequestration. In Phase II, a field study will be conducted to evaluate the application of the deep rooting technology to the establishment of non-irrigated trees in semi-arid conditions with ground water 50 or more feet below ground surface. Also, to provide additional incentive to utilize the carbon sequestration benefits of deep rooting technology, greenhouse and small-plot research will be conducted to evaluate the potential for expanding deep rooting technology to trees that have greater commercial value, such as fruit, nut, and valuable hardwood species. Commercial Applications and Other Benefits as described by the awardee: The establishment of self-irrigated low-maintenance windbreaks or shelterbelts in semi-arid climates, where carbon is not readily recycled, should create an enhanced net positive carbon sequestration regime and be potentially useful in blocking desertification in some areas. In addition, application of deep root technology to tree crop management (in citrus groves, for example) should not only offer enhanced carbon sequestration, but also allow for the control and/or reduction of production resources such as energy, water, fertilizer, and pesticides.