The purpose of the project is to develop new guidelines for restoring root health and improving overall tree nutrition in Florida oranges and grapefruit. The objectives of the project are to:1. Determine optimal nutrient concentrations in roots and leaves for multiple grapefruit and orange varieties.2. Compare and contrast fertigation, soil, and foliar fertilization to identify best application method for uptake of nutrients into both underground and aboveground components.3. Investigate the relationship between root and leaf nutrient contents to tree health, yield, and fruit quality as well as bacteria titer.4. Generate updated and new guidelines for optimal nutrient contents for roots and leaves for HLB-affected trees.�Progress to date:The project is being implemented at three sites at Citrus Research and Education Center (CREC), Southern Gardens Citrus near Clewiston, FL and Indian River Research and Education Center (IRREC). First preliminary data collection (on yield, fruit size, juice quality, canopy size, HLB and other disease ratings, soil characteristics and root growth and nutrition) has been completed at the 3 sites in the first and second quarters. First nutritional treatments have been imposed in spring 2019 and will be continued as scheduled. Data collection will continue and analyses will be done as needed. Updates and data will be presented in future extension meetings after about a year or two of data collection and validation of results to get feedback from growers and the citrus industry.�Plans for Next QuarterThe team will continue with data collection and reporting on the progress of the project.��