10 Oct 2017
2017 California Nursery Conference: Part Two
Jim Owen (Virginia Tech), John D. Lea-Cox (University of Maryland), Tom Fernandez (Michigan State University), Bruno Pitton and Lorence Oki (University of California), John Majsztrik (Clemson University)
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. This second part (of three) covers economic costs of water conservation, how to control pH and salts, as well as tools and models for water management. The topics covered are:
2-1SSaveCostsRefiningSubstrateNutrientProgram (3372 KB) 2-2IrrigationManagementUsingSoilMoistureSensors (2805 KB) 2-3Wheredonutrientsgowhenyouirrigate (2760 KB) 2-4NitrogenManagementPlans (631 KB) 2-5Addingtoolsintoyourwatermanagementtoolbox (447 KB)
19 Jul 2017
Yield, quality and profitability of sensor‑controlled irrigation: a case study of snapdragon (Antirrhinum majus L.) production
Saavoss, M., Belayneh, B., Lea‑Cox, J., Lichtenberg, E. (University of Maryland), Majsztrik, J. (Clemson University)
On-farm research has found a number of advantages of sensor-based irrigation compared to current irrigation practices including reduced water application, disease incidence, production time and labor, and increased profitability. We examined the effects of sensor-based irrigation in a commercial greenhouse producing cut-flower snapdragons. We calculated changes in yield, production time, quality, cost, revenue and profit, using 3 years of data before and after implementation of sensor irrigation networks. Sensor-based irrigation increased revenue by 62% and profit by 65% per year. Sensor-based irrigation was also associated with increases in the quality and the number of stems harvested per crop.
See the article in the link bellow
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)