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)
14 Sep 2016
When to Fertigate: The Influence of Substrate Moisture Content on Nutrient Retention in Containerized Crop Production
McPherson, S., Owen, J.S., Brindley, J., Fields, J.S. (Virginia Tech)
The efficient use of fertilizers is key to increase profitability for the agriculture industry (nursery and greenhouse). Fertigation efficiency increased as pine bark substrate moisture increased (38% to 56% gravimetrically). It was hypothesized that mineral retention occured with uniformly distributed water.
SNA Research Conference Vol. 60 2015
SNA When to fertigate (179 KB)