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Soilless Subrates
- 1. Understanding Bark, Peat, and Pumice in Your Soilless Substrate J.S. Owen Jr., M. Zazirska-Gabriel, and D. Sullivan Oregon State University, Aurora, OR J.E. Altland Application Technology Research Unit, USDA-ARS, Wooster, OH J.P. Albano US Horticultural Res. Lab, USDA-ARS, Fort Pierce, FL
- 2. Douglas Fir Bark AGED FRESH Altland
- 5. Year 1 Percent volume Fresh Aged Time (months) 46%»29% 59%»50% Air Space (AS)
- 6. Percent volume Fresh Aged Time (months) 42%»58% 27%»34% Container Capacity (CC) Year 1
- 7. Year 2 Percent volume Fresh Aged Time (months) 47%»59% 34%»47% Container Capacity (CC)
- 8. Year 2 Percent volume Fresh Aged Time (months) Up to 80% unavailable water Container Capacity (CC) Up to 60% unavailable water
- 17. Weigelia crop response Peat
- 18. Weigelia crop response Peat Peat Pumice Percent addition (by vol.) Dry weight (g) Significant (p < 0.05 ) linear and quadratic response for peat and pumice, respectively peat vs pumice ** bark vs peat ** bark vs pumice NS
- 19. 45% Control (100% DFB) Percent addition (by vol.) 30% 15% Pumice Peat
- 20. Water applied to Weigelia (0.2 LF) Significant (p < 0.05 ) linear response for peat. Peat Pumice Percent addition (by vol.) Water applied (L) peat vs pumice ** bark vs peat ** bark vs pumice NS
- 21. Weigelia water status as ƒ(leaf length) *Significant (p < 0.05 ) linear and quadratic response for peat and pumice, respectively Peat Pumice Percent addition (by vol.) peat vs pumice NS bark vs peat ** bark vs pumice **
- 22. Azalea crop response
- 23. Azalea crop response Peat Peat Pumice Percent addition (by vol.) Dry weight (g) peat vs pumice NS bark vs peat ** bark vs pumice NS Significant (p < 0.05 ) linear response for peat.
- 24. Azalea water use efficiency (WUE) Peat Pumice Percent addition (by vol.) WUE (g mL -1 ) peat vs pumice NS bark vs peat ** bark vs pumice NS Significant (p < 0.05 ) linear response for peat.
- 25. 45% Control (100% DFB) Percent addition (by vol.) 30% 15% Pumice Peat
- 27. Jim Owen: 503.678.1264 or jim.owen@oregonstate.edu
Notes de l'éditeur
- peat vs pumice ** bark vs peat ** bark vs pumice NS
- When water availability decreases, turgor potential typically decreases, thereby inhibiting cell elongation, leaf expansion, and plant growth. Kim, J. and M.W. van Iersel. 2009. Daily water use of abutilon and lantana at various substrate water contents. Proceedings of the SNA research conference 54: 12-16.