19 Oct 2021
A nursery system nitrogen balance for production of a containerized woody ornamental plant
Bruno J.L. Pitton, Lorence R. Oki, Jared Sisneroz, and Richard Y. Evans (University of Califronia, Davis)
Crop producers should identify nitrogen (N) inputs and outputs to calculate potential N available for leaching into groundwater to reduce nitrate contamination in intensive agricultural production areas. However, poor understanding of N fate in container plant production may result in inaccurate estimation of potentially leachable N. To improve understanding of container-applied N fate, an experiment was conducted to measure N inputs and outputs from a woody ornamental plant (Lagerstroemia indica ‘Whitt II’) production system fertilized with controlled-release and surface-applied fertilizer.
Read the research article to understand the impact nursery production has on nitrate contamination of groundwater
4 Oct 2021
Specialty crop retention reservoir performance and design considerations
Mohammed Nayeb Yazdi (Ohio State University), James S. Owen Jr (USDA), Steve W. Lyon (Ohio State University), and Sarah A. White (Clemson University)
Specialty crop production requires large volumes of water for irrigation and faces four interconnected water resource concerns: (1) water availability and security, (2) need for high water quality (3) management of irrigation return flow and operational water quality from production areas, and (4) increasing consumer and regulatory pressure to mitigate non-point source runoff. Retention reservoirs are an effective best management practice for extending water resources and reducing an adverse effect on the environment.
Read the research article to learn about various treatment processes within retention reservoirs in specialty crops.
10 Aug 2020
Nutrient and pesticide remediation using a two-stage bioreactor-adsorptive system under two hydraulic retention times
Damon E. Abdi, James S. Owen Jr, Julie C. Brindley, Anna C. Birnbaum, P. Chris Wilson, Francisca O. Hinza, Gemma Reguera, Joo-Young Lee, Bert M. Cregg, Daniel R. Kort, R. Thomas Fernandez
Nutrients and pesticides in irrigation return flow from agricultural operations pose an environmental risk. Water treatment systems, such as woodchip bioreactors and expanded aggregate filters, can be used to remediate these contaminants. Our objectives were to investigate agrochemical removal with these systems when operated under an extended hydraulic retention time (HRT) of 3 days and a rapid HRT of 21 minutes. A 3 day HRT effectively reduced nitrate and phosphate below 0.2 ppm in woodchip bioreactors and expanded shale filters, respectively; while a 21 minute HRT was sufficient for removing 50-75% of influent pesticide content but not for nutrient removal.
Click here to read the research article