8 Apr 2020
Having Success with Organic Growing Mixes
Paul Fisher, Jin Huang, Maria Paz, and Ryan Dickson (University of Florida)
Organic production of edible and medicinal crops in greenhouses is increasing. At the University of Florida, we've been evaluating production pf potted organic edible plants for retail sale. This article is primarily intended for growers already using conventional growing methods who also want to produce organic transplants or retail potted products.
HavingSuccesswithOrganicGrowingMixes (821 KB)
25 Nov 2019
Seeing inside your container media
Paul Fisher, Erin Yafuso, and Enna Bohorquez (University of Florida)
When you buy a good-quality root substrate, you are mostly purchasing holes. Solid particles from peat, bark, perlite, wood fiber and other components typically make up only about 20 to 30% of volume when a pot is filled with root substrate. The rest is made up of spaces, termed pores, which are filled with either air or water. It is difficult to visualize substrate physical properties such as porosity, but pores have a major effect on plant performance. In this article, we will try to help you see pores in a new light.
7 Aug 2018
Oxygenation of Irrigation Water during Propagation and Container Production of Bedding Plants
Yafuso, E.J., and P. Fisher (University of Florida)
Research at the University of Florida focused on evaluating whether oxygenation of irrigation water affected plant growth and substrate dissolved oxygen (DO) levels during mist propagation of unrooted cuttings and subsequent growth in containers. There were no measured differences in root growth when ambient tap or oxygenated water was used during mist propagation of calibrachoa or lobelia. Water that passed through fine mist nozzles increased the droplet surface area decreasing DO in super-saturated water and increased DO in ambient tap water to 100% DO saturation (8.7 ppm). Continued growth of three bedding plants were irrigated with nutrient supplemented water at ambient or oxygenated DO levels when pots dried to 45% of container capacity resulted in similar growth. Peat-based substrate contains high porosity facilitating oxygen supply to roots through air-filled pores. Read on to learn the key findings.
HortScience 2017 Yafuso and Fisher (306 KB)