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Water and Air Relations in Propagation Substrates.

Authors :
Yafuso, Erin J.
Fisher, Paul R.
Bohórquez, Ana C.
Altland, James E.
Source :
HortScience. Nov2019, Vol. 54 Issue 11, p2024-2030. 7p.
Publication Year :
2019

Abstract

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 ("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) that variedwidely in physical characteristics using fourmethods: 1) evaporationmethod with a tensiometer, 2) frozen columnmethod, 3) gravimetric analysis, and 4) X-ray computed tomography (CT) analysis. Moisture retention curves based on evaporation (1) and the frozen column (2) resulted in differences for peat, but similar curves for rockwool and foam. The frozen column method was simple and low cost, but was constrained by column height for peat, which had a higher water potential compared with the other two substrates. Substrate porosity analysis at container capacity by gravimetric or CT methodswere similar for volumetricwater and air content (VWCand VAC) in rockwool and foam, but differed for peat for VWC and VAC.Gravimetric analysis was simple, rapid, and low cost for whole-cell analysis, but CT further quantified spatial water and air relations within the cell and allowed visualization of complex water and air relations in an image. All substrates had high water content at container capacity ranging from 67%to 91%VWC with 5%to 11%VAC in the short propagation cells, emphasizing the need for careful irrigation management. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00185345
Volume :
54
Issue :
11
Database :
Academic Search Index
Journal :
HortScience
Publication Type :
Academic Journal
Accession number :
139641551
Full Text :
https://doi.org/10.21273/HORTSCI14145-19