12 Oct 2020
Water and air relations in propagation substrates
Erin J. Yafuso, Paul R. Fisher, Ana C. Bohórquez (University of Florida), and James E. Altland (USDA-ARS)
Greenhouse propagation of unrooted plant cuttings is characterized by short container cell height and high irrigation frequency. These conditions can result in high moisture level and low air content in soilless container substrates, causing delayed growth of adventitious roots and favoring root disease. The objective of this study was to quantify and compare substrate water and air relations for three propagation substrates (peat, rockwool, and phenolic foam).
Click here to read the research article
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.