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Adding Clays to Pine barkPotting Substrates
Jim Owen, Stu Warren & Ted Bilderback
Department of Horticulture ScienceNorth Carolina State University
FERTILIZER
SUBSTRATE
IRRIGATION
ContainerContainer
Managing the Container System
Narrow border/filter strips are helpful, but not letting nutrients out of the pot saves money and protects watersheds
Amending Container Substrate With Clay
Amending Container Substrate With Clay24/48 4/20
EXPERIMENTAL SUBSTRAES
Treatment Substrate
8PB:1SAND Industry Standard
OD 5/20 LVM Pine Bark + 8% 5-20 mesh LVM
OD 4/20 RVM Pine Bark + 8% 4-20 mesh RVM
OD 24/48 LVM Pine Bark + 8% 24-48 mesh LVM
OD 24/48 RVM Pine Bark + 8% 24-48 mesh RVM
Root and Shoot Dry Weights
0
0.5
1
1.5
2
2.5
8PB:1SAND OD 5/20 LVM OD 4/20 RVM OD 24/48 LVM OD 24/48 RVM
Treatment
Volume (L)
Irrigation Water Consumed Leachate
A BC
C
BBC
C
A
CB
B
AB
BC CD D
Irrigation Partition
Irrigation water applied, plant use, water leached (L) over 112 days to maintain a 0.20 leaching fraction for Cotoneaster in pine bark substrates amended with 8% clay
Water Applied Plant Use (Evapotranspiration)
Leached
Cumulative Irrigation Applied
Cumulative amount of water (L) applied to maintain a 0.2 leaching fraction on Cotoneaster grown in pine bark substrates amended with clay.
Cumulative Phosphorus Loss
Cumulative amount of phosphorus lost over 112 days from 3.7 gal containers pine bark substrates amended with clay to grow Cotoneaster while maintaining a 0.2 leaching fraction.
Total phosphorous leached (mg) per container over 112 days to maintain a 0.20 leaching fraction while growing Cotoneaster spp. In pine bark substrates amended with 8% clay.
Cumulative Phosphorus Loss
Cumulative Ammonium Loss
Cumulative amount of ammonium lost over 112 days from 3.7 gal containers pine bark substrates amended with clay to grow Cotoneaster while maintaining a 0.2 leaching fraction.
Significance to the Industry
• 100,000-200,000 gallons of WATER / A bed space– Significant Drought & Water Conservation Impacts
• 67% less Phosphate leached from containers– Watershed protection
• Equivalent Growth to Pine bark:Sand
Adding Clay to pine bark potting mixes may help keep the Monsters out of irrigation supplies and watershed protection.