24 Oct 2017
2017 California Nursery Conference: Conclusion
Brett Cregg (Michigan State University), Paul Fisher (University of Florida), Sarah White (Clemson University), Charlie Hall (Texas A&M), and Bruno Pitton, Darren Haver, Grant Johnson, Loren Oki (University of California)
This conference, held on July 27, 2017 in Irvine, CA, focused on Water Management in Nursery and Greenhouse Production. The Clean WateR3 team presented their research studies. The conclusion of the conference dealt with recycling water: economics, monitoring quality, managemet of nutrients and agrichemicals, and pathogens and biofilm. The topics covered are:
3-1ImpactsRecycledWateronPlantPhysiologyandgrowth (1175 KB)
3-2BiofilmManagement (3947 KB)
3-3BiologicalTreatmentofRunoff (4394 KB)
3-4SlowSandFilters (2204 KB)
3-5WaterRecyclingEconomics (1245 KB)
9 May 2017
How Much Does It Cost to Sanitize Your Water
Raudales, R. (University of Connecticut), Fisher, P. (University of Florida), Hall, C.(Texas A&M University)
Sanitation of pond water and recirculating water is essential to prevent waterborne pathogens. There are many sanitizing options such as chlorine dioxide, copper ionization, ozone, and sodium hypochlorite, to name a few. The cost of the equipment (capital cost) and sanitizing treatment (operational cost) is presented in this article.
The cost for sanitation in irrigation water is the second article in a three-part series of water management in GPN magazine.
See the article in the link below.
28 Sep 2016
Remediating Paclobutrazol From Irrigation Water Using Activated Carbon
Grant, G.A., Fisher, P., Barrett, J.E., Wilson, C.P. (University of Florida)
Recirculating irrigation water can sometimes have residual agrichemicals present, such as paclobutrazol. Paclobutrazol is an active ingredient used in plant growth regulators to control plant height. The objective of this project was to use granular activated carbon filtration (GAC) to remove paclobutrazol using different contact times. A 0.05 mg·L-1 (50ppb) paclobutrazol solution was passed through a small-scale, 0.50 to 4.75 mm particle size (8x30 mesh) coconut coir GAC system. A bioassay of broccoli seeds and begonia seedlings were used to show the effect of before and post GAC filtered water. Paclobutrazol concentration decreased by 90% or 99% with a contact time of 12 seconds or 59 seconds GAC, respectively. Overall, this experiment showed that granular activated carbon has the potential to remediate paclobutrazol from irrigation water to below biologically-active concentrations.
ASHS Abstract 2016 Grant (270 KB)