International Symposium on Growing Media, Soilless Cultivation, and Compost Utilization in Horticulture

Scientific Program


The scientific program will be held on the third floor of the Smith Memorial Student Union of Portland State University
located at 1825 SW Broadway, Portland, OR 97201
Program is subject to change


8:30 – 13:00 Registration
9:00 – 13:00 Poster Set up
12:30 – 12: 45 Board Buses for Tours
14:00 – 15:15 Tour of Monrovia
15:30 – 16:15 Tour Carlton Plants
17:30 Return to Portland
18:00 – 20:00 Welcome Reception at Rogue Hall Brewery
Dinner on you own


7:00 – 17:00 Registration
8:45 – 9:15 Welcome address
9:15 Keynote: A review of the challenges facing ISHS members as they move towards sustainable growing media.
Neil Charles Bragg
10:00 – 10:45 Coffee break: Solar Eclipse Viewing
SESSION I: Student paper presentations
10:45 – 11:00 010 Hydrothermally treated Eucalyptus globulus bark: an innovative organic material for plant substrates.
Catarina Chemetova, A. Fabião, J. Gominho, H. Ribeiro
11:00 – 11:15 012 Pre-plant incorporation of compost as a non-fumigant alternative to promote the establishment of fruit trees at old orchard sites.
Tristan Watson, L. Nelson, D. Neilsen, G. Neilsen, T. Forge
11:15 – 11:30 019 The potential of residues from heathland and forest management as a growing medium component and possible peat alternative for the ornamental sector.
Audrey Miserez, E. Pauwels, B. Schamp, B. Reubens, V. Nelissen, O. Grunert, W. De Nolf, L. De Nolf, K. Vancampenhout, J. Ceusters
11:30 – 11:45 031 Redefining phosphorus nutrition and deficiency symptomology for ornamentals grown in soilless substrates.
Josh Henry, B. Whipker, I. McCall
11:45 – 12:00 034 Coir-based growing substrates for indoor medicinal cannabis production.
Deron Caplan, M. Dixon, Y. Zheng
12:00 – 13:30 Lunch on your own (Note list of nearby restaurants in registration package)


13:30 – 13:45 052 Dynamics of C ,N and C:N ratio in substrates based on miscanthus straw in container production of Spiraea japonica ‘Macrophylla’.
Magdalena Pancerz, P. Babelewski, R. Debicz, R. Waclawowicz
13:45 – 14:00 041 Maturation of swine lagoon compost.
Paige Herring, H. Kraus, A. Noah
14:00 – 14:15 099 3-Dimensional Characterization of Substrates with X-ray Microtomography.
Paul Bartley, B.E. Jackson, W.C. Fonteno
14:15 – 14:30 104 Formulating Green Roof Substrates for Nutrient Retention and Reducing Runoff Pollution.
Tyson Jennett, Y. Zheng
14:30 – 14:45 107 Wettability and hydrology of various wood fiber substrates and substrate components.
James Smith, B.E. Jackson, W.C. Fonteno
14:45 – 15:00 062 Developing precision irrigation scheduling with a physiologically based or a substrate physical properties-based system for nursery production.
Nastaran Basiri Jahromi, F. Walker, A. Fulcher, J. Altland
15:00 – 15:30 Summary of the 2017 ISHS Growing Media Working Group Survey
Jean-Charles Michel
15:30 – 15:45 Coffee break – Visit Posters
15:45 – 17:00 Student Poster Session (see list below)
17:30 – 19:30 Happy Hour Social at the RiverPlace Hotel
Dinner on your own


7:30 – 7:45 Board Buses at Smith Memorial Student Union
8:45 – 10:00 Tour Phillips Soil
10:30 – 14:00 Tour Woodburn Nursery and Azaleas
14:30 – 16:30 Visit Oregon Flowers
17:15 – 19:00 Self-guided tour of Oregon Garden & Happy Hour
19:00 – 20:15 Dinner at Oregon Garden: Northwest Cuisine
21:30 Return to Portland State University/Smith Memorial Student Union



7:00 – 16:30 Registration
8:00 – 8:45 Keynote: Past, Present, and Future of Compost Utilization in Horticulture.
Monica Ozores-Hampton
8:45 – 9:00 001 Compost Tea Influence on Lettuce (Lactuca sativa L.) Root Architechture.
Gaius Eudoxie, K. Grogan, M. Beckford, M. Martin
9:00 – 9:15 004 Compost Field Trials on Horticultural Tree Nursery Fields.
Tamara Thomas, J. Barborinas, J. Doyle, K. Wynn
9:15 – 9:30 075 Utility of compost and wood mill waste amendments to mitigate severe replant stress of sweet cherry.
Thomas Forge, D. Neilsen, G. Neilsen, P. Munro, T. Watson, L. Nelson, M. Jones
9:30 – 9:45 018 Hot water extractable carbon as a cheap and reliable indicator of soil quality improvement by compost application.Bart Vandecasteele,
J. Debode, T. Vanden Nest, T. Dhose, G. Ruysschaert, K. Willekens
9:45 – 10:15 Coffee break & poster presentations: ‘Compost and organic waste utilization’ and ‘Microbial Ecology’ (see list below)


10:15 – 10:30 038 Suitability of swine lagoon compost as transplant media for basil and tomato.
Helen Kraus, A. Noah, P. Herring
10:30 – 10:45 090 Enhancing the benefits of compost-based fertilizers in diverse horticultural applications.
Brian Gardener
10:45 – 11:00 002 Interactions of moisture, oxygen and compost during storage.
Chris Blok, B. Eveleens, A. van Winkel.
11:00-11:15 087 Compost pH adjustment: quantifying differences in pH buffering capacity among composts.
Dan Sullivan
11:15 – 11:30 093 Prevalence and mitigation of recalcitrant herbicides in composts.
Frederick Michel, K. Spelcher, B. Zang, L. Huezo
11:30 – 11:45 020 Spent growing media as a resource for composting: recycling C and nutrients for sustainable horticulture.Bart Vandecasteele,
J. Viaene, B. Reubens, K. Willekens, J. Debode, T. Van Delm
11:45 – 13:15 Lunch on your own. Note list of nearby restaurants in registration package.


ORAL PAPER SESSION II: Alternative substrates
13:15 – 13:30 060 Bamboo compost as substrate for Anthurium solitarium.
Janie Mendes Jasmin, M.Q. Maitan
13:30 – 13:45 070 Crop responses to additions of a recycled ligno-cellulose fiber `pittmoss®´ into growing media.
Charles Bethke
13:45 – 14:00 043 Plant fibers for renewable growing media: acidification or inoculation with biocontrol fungi to reduce the N drawdown in extruded Miscanthus straw.
Bart Vandecasteele, J. Debode, H. Muylle, I. De Windt, J. Van Acker, N. Jacquet, A. Richel, N. Ameloot, K. Moreaux
14:00 – 14:15 053 Influence of geocomposite application on pH, EC and N, P, K, Mg and Ca content in peat substrate in cultivation of selected ornamental shrubs.
Magdalena Pancerz, P. Babelewski
14:15 – 14:30 057 Inoculated plant fibres for sustainable and disease suppressing growing media.
Jane Debode, C. De Tender, P. Cremelie, T. Deswaef, H. Muylle, B. Vandecasteele


14:30 – 15:00 Coffee break & poster presentations: ‘Nutrition’ (see list below)


15:00 – 15:15 021 Changes in substrates’ wettability according to irrigation methods.
Chloé Coste, R. Nemati, W.C. Fonteno, J.C. Michel
15:15 – 15:30 028 Water management in peat-reduced and peat-free growing media: the effects of different frequency and volume on pelargonium.
Paul Alexander, N. Bragg, I. Nevison
15:30 – 15:45 102 Influence of substrate composition when producing containerized horticultural crops at optimal and suboptimal substrate water potential.
James Owen, J. Fields
15:45 – 16:00 026 Relevant hydraulic properties of peat based mixes for explaining root development according to irrigation strategies.
Jean-Charles Michel
16:00-16:15 068 Manipulating ligno-cellulosic materials as a model for producing growing media amendments.
Charles Bethke
16:15 – 16:30 113 Watermelon grafting plants behaviour in phenolic foam compared to peat substrates.
Daniel Fernandez, Maria Teresa Lao, Alfonso Llanderal Quiroz
17:30 – 19:00 Happy Hour Social at the Portland Art Museum
19:00 – 21:00 Banquet: Portland Art Museum
Participation for advance ticket holders only


7:00 – 12:00 Registration
8:00 – 8:45 097 Keynote: Emergent and existing technologies to measure the substrate, plant, and atmosphere continuum.
Colin Campbell
Oral Paper Session IV – Substrate Properties
8:45 – 9:00 098 Computerized particle analyzer: the next generation of particle analysis.
Paul Bartley, B.E. Jackson, W.C. Fonteno
9:00 – 9:15 003 Using a simple mixing model to predict rooting media properties.
Chris Blok, B. Eveleens, A. van Winkel
9:15 – 9:30 105 Substrate pore structure: Understanding through visualization.
William C. Fonteno III, B. Jackson, P. Bartely
9:30 – 9:45 065 Evaluation of plant development in a selection of retail plant growing media using shoot and root (2d And 3d) assessment.
Owen Doyle, C. Comerford, S. Tracy, R. O’Haire, T. Moore, D. Ni Chualain
9:45 – 10:15 Coffee break & poster presentations: ‘Plant physiology’ (see list below)
Oral Paper Session V – Nutrition
10:15 – 10:30 006 Research on Fertigation Scheduling for Cucumber under Coir Culture Based on Moisture and EC sensors.
Youli Li, W. Guo, Q. Zhao, L. Wang, Y. Gao, X. Xue
10:30 – 10:45 027 Interactive effect on pH of ammonium:nitrate fertilization ratio and the pH buffer of growing media.
Hans Verhagen
10:45 – 11:00 110 Quantifying the acidic and basic effects of fifteen floriculture species grown in peat-based substrate.
Ryan Dickson, P. Fisher
11:00 – 11:15 100 Controlled release fertilizer placement and rate effect crop growth and substrate pH and electrical conductivity.
James Owen, A. LeBude
11:15 – 12:30 Business Meeting
12:30 – 14:00 Lunch and FarWest Show on your own
Dinner on your own


7:00 – 16:00 Registration
Oral Paper Session VI – Properties of Sustainable Substrates
8:00 – 8:15 111 The transition to responsibly sourced growing media for UK Horticulture.
Barry Mulholland, K. Waldron, A. Watson, G. Moates, C. Whiteside, S. Newman, J. Davies, R. Hickinbotham
8:15 – 8:30 049 The social responsibility journey of Canadian’s peat moss industry: from research to practices.
Stéphanie Boudreau
8:30 – 8:45 108 The global evolution of wood substrates: recent observations and discoveries.
Brian Jackson, W. Fonteno
8:45 – 9:00 089 Performances of new materials for peat substitution in horticulture application.
Claire Grosbellet, E. Beaudet, E. Duclaud
9:00 – 9:15 044 Can coir pith replace peatmoss for horticultural purpose in future?
Jos van Doren
9:15 – 9:30 005 Researched, developed and commercialized: GreenFibre.
Gerald Kurt Schmilewski
9:30 – 9:45 103 Influence of Miscanthus-based growing media with the amendment of hydrogel and different multicomponent fertilizers on the fresh biomass of Hydrangea arborescens ‘Annabelle’.
Magdalena Pancerz, P. Babelewski
9:45 – 10:00 042 Necessity for indicator plants to test contamination of new constituents in growing media.
W.H.C. Geuijen, J.B.G.M. Verhagen


10:00 – 10:30 Coffee break & poster presentations: ‘Substrate properties & sustainability’ (see list below)
10:30 – 10:45 046 The impact of organic and chemical fertilizers in bagged peat-based substrate under different storage conditions.
James Altland, K.Y. Jeong
10:45 – 11:00 055 The impact of controlled release fertilizer on bagged peat-based substrate under different storage conditions.
Ka Yeon Jeong, J. Altland
11:00 – 11:15 114 Combined effect of Rock Dust and Vermicompost on Dahlia (Dahlia pinnata) Plant Growth and Development.
Lord Abbey, L. Wang, S. Veitch
11:15 – 11:30 101 Strategies for assessing changes in organic matter during the aging process.
Laura Kaderabek, B. Jackson, W. Fonteno
11:30 – 11:45 069 Determination of the liming potential of ligno-cellulosic materials as a model for application in blending recycled substrates.
Charles Bethke
11:45 – 13:00 Lunch


Oral Paper Session VII – Nutrition, irrigation & miscellaneous
13:00 – 13:15 035 Effect of Electrical Conductivity on the Productivity and Nutrient Uptake of Lactuca sativa `Salanova®´ grown using Nutrient Film Technique (NFT)
U.C. Samarakoon, C. Fyffe, J. Bale, P. Ling, S. Basnagala, N. Donley, J. Altland
13:15 – 13:30 011 Zero discharge of nutrients and pesticides to the environment in hydroponic production.
Erik Van Os, E. Beerling, J. Van Ruijven, M. Van der Staaij, J. Janse, R. Kaarsemaker
13:30-13:45 008 Yield and quality of water spinach (Ipomoea aquatica Forsk) as influenced by hydroponic nutrient solutions with different pH adjustments.
Wang Lichun, G. Wenzhong, X. Xuzhang
13:45 – 14:00 073 Development of new bio-insecticides for greenhouse production.
Rémi Naasz
14:00 – 14:15 072 A microbial revolution: Using microbes to fertilize the world.
Oliver Grunert, E. Wambacq, M. Sakarik, J. Spanoghe, G. Gomes de Sousa, A. Alloul, M. Spiller, V. Derycke, L. Stragier, H. Verstraete, K. Fauconnier, G. Haesaert, S. E. Vlaeminck


14:15 – 14:45 Coffee break


Oral Paper Session VII – Substrate properties
14:45 – 15:00 058 The strawberry rhizosphere microbiome in response to biochar and Botrytis cinerea leaf infection.
Caroline De Tender, J. Debode, A. Haegeman, P. Cremelie, B. Vandecasteele, M. Maes
15:00 – 15:15 054 Nutrient bioavailability in biochar-worm casting growing media for production of organic basil and bell pepper.
Mehdi Sharifi, M.R. Ardakani
15:15 – 15:30 045 Assessing biochar as a lime replacement for peat substrates.
Lesley Judd, B. Jackson, D. Hesterberg, M. Boyette, M. Evans, W. Fonteno
15:30 – 15:45 082 Oxygen availability, not phenolic acids, is the primary driver for nitrification in soilless systems.
Beatrix Waechter Alsanius


15:45 Final summary and conclusion
16:00 Symposium Adjourned


Student posters
017 The potential of aged Acacia melanoxylon bark as a source for alternative substrate.
Catarina Chemetova
, S. Braga, A. Fabião, J. Gominho, H. Ribeiro
032 Nutrient disorders of Lactuca sativa `Salanova Red´.
Josh Henry, B. Whipker, I. McCall
033 Coleus growth response to nitrogen concentrations.
Josh Henry, B. Whipker, I. McCall
079 Incorporating slow release coated polymer aluminum sulfate into the substrate to produce blue hydrangeas.
Hunter Landis, K. Hicks I. McCall B.E. Whipker
088 Designing a synthetic soil from polymer foams.
Harry Wright
112 Nitrification and dilution of plant residue derived digestate in NFT cultivation of Brassica leafy vegetables.
Olle Lind, M. Hultberg, H. Asp*
040 Tifton roots as substrate for air-layering litchi tree.
Kezia Moraes Vieira, D.C. Baitelle, M.V. Sandoval Paixão, P.C. dos Santos*, A.J. Cordeiro de Carvalho

Compost and organic waste utilization

066 Dairy by-products in composts used as peat diluents in growing media.
W.R. Carlile, D. Ni Chualain
061 Production of Rangpur lime saplings in substrate amended with tannery sludge.
Paulo Cesar dos Santos. T. Nunes Tudeia, D. Corona Baitelle, S. de Jesus Freitas, S. da Silva Berilli, S. de Paiva Freitas, W. Souza da Silva
039 Harvest yields of greenhouse tomatoes grown in pine bark amended cotton gin compost.
Brian Jackson, A. Wright, J. Kemble
016 Effect of reused cocopeat substrate on growth and yield of summer-cultivated paprika in EC-based recycling hydroponic cultivation.
Il-Seop Kim, D.C. Jang, K.Y. Choi, J.K. Kim
Microbial ecology
092 Characterization of microbial community structure in pine bark substrates.
J. Altland, F. Michel, S. Valles
064 Response of the soil microbiome to compost amendment.
Jane Debode, C. De Tender, P. Cremelie, T. D’Hose, G. Ruysschaert, B. Vandecasteele
074 Effect of growing media with beneficial microorganisms on the aquaponic production of strawberries.
Rémi Naasz, F. Barraud
085 Assessing the severity of damping-off caused by Pythium ultimum and Rhizoctonia solani in peat-based greenhouse substrates amended with pine wood chip aggregates.
W.G. Owen, B.E. Jackson, B.E. Whipker, W.C. Fonteno, D.M. Benson
063 Implications on the root microbial community in the presence of Pythium ultimum in soilless cultivation systems
Anna Rosberg, B. Alsanius, M. Hultberg, W. Wohanka
096 The mini-horhizotron as a tool for assessing disease severity in container grown annuals.
Laura Kaderabek. B. Jackson, W. Fonteno
Plant nutrition
078 Expanding leaf tissue nutrient sufficiency standards for floriculture species.
Hunter Landis, K. Hicks, W.G. Owen, I. McCall, B.E. Whipker
077 Characterization of nutrient disorders of Pelargonium x domesticum.
Brian Whipker, I. McCall
076 Plant growth affected by low substrate pH without inducing leaf symptomology of petunia and poinsettia.
Brian Whipker, W.G. Owen, B. Jackson, I. McCall
013 Biochar can enhance potassium availability during cyclamen cultivation.
Patrizia Zaccheo, L. Crippa, F. Bedussi
007 Nitrate concentration determination using UV absorption spectra based on Multiple Linear Regression.
Wengang Zheng, L. Jiao, D. Dong
Plant physiology
086 Stacking substrate-filled containers influence root and shoot growth of bedding plants.
W.G. Owen, R.G. Lopez
095 Effect of propagation cell density and use of a nursery stage on plant growth of ‘Rex’ lettuce in hydroponic production.
Michael Evans, H. Quick
Substrate properties and sustainability
071 Hydration efficiency and wettability of two biochars.
Lesley Judd, B. Jackson, W. Fonteno
014 Influence of pumice on ammonium dynamic in soilless culture.
Laura Crippa, P. Zaccheo, F. Bedussi
024 Potential use of `End of Life´ stone wool as substrate component.
Jean-Charles Michel, M. Donners, J. Verhoeven
109 Specific surface area of growing medium’ components.
Jean-Charles Michel, B. Jackson, W.C. Fonteno
081 Cucumber culture on woodfiber substrate amended with Greenchar®.
Claire Grosbellet, A. Braud, S. Afonso, E. Beaudet
009 Insect-proof covered screenhouse to increase chinese flowering cabbage yield and water use efficiency in arid areas.
Guo Wenzhong, L. Wang
037 Green City Solutions- A new concept for greener cities and reduction of air pollution.
Fritz-Gerald Schröder, P. Saenger
115 Biochar as an alternative growing media in greenhouse vegetable production.
Angieszka Medynska-Jurazek, Irmina Cwielag-Piasecka, Piotr Chohura, Cecylia Uklanska-Pusz
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