14 Sep 2016
Exploring the Influence of Particle Size on Plant Water Availability in Pine Bark Substrates
Fields, J., Owen, J.S., Scoggins, H. (Virginia Polytechnic Institute and State University)
There is potential to reduce water and nutrient use over crop production by optimizing pine bark substrates. Varying pine particle size and the addition of fibrous material (peat and coir) can change the air space, water holding capacity, and plant available water. These insights can help growers develop optimal pine bark substrates that can produce a salable crop with reduced water use.
SNA Research Conference Vol 60 2015
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)
1 Aug 2016
The Effect of Oxygenation of Water on Dissolved Oxygen Measurements in Irrigation Water and Container Substrate
Yafuso, E.J. and Fisher, P. (University of Florida)
Oxygen supply is essential for root growth and nutrient uptake for plants. There are many ways to supply oxygen to plants roots, in this study we focused on oxygen injection systems. Oxygen injecting systems are an option to increase dissolved oxygen (DO) in irrigation water. Two experiments evaluated (1) the persistence of super-saturated DO in irrigation lines, and (2) the DO level in container substrates irrigated with super-saturated water. We learned that passing water through a mist nozzle caused DO to reach an equilibrium saturated level in irrigation water, regardless of whether oxygen was injected. In the substrate, a large volume of oxygenated water was required to increase DO in the substrate. These experiments provide baseline knowledge for upcoming plant trials.
ASHS Abstract 2016 (28 KB)