Professor; Extension Specialist
Dr. Walworth's research is focused on nutrient requirements for Arizona crops, especially pecans, turfgrass, and vegetables. Nutrient requirements and management in contaminated soils, concentrating on effects of nitrogen on soil water potential and microbial petroleum biodegradation. Irrigation water and soil salinity management in agricultural soils. Application of waste materials to soils, studying rates of degradation of soil-applied animal manures and environmental impacts of on-site human waste disposal systems.