Articles
Characterisation of peat-free propagation mixes for selected physical and chemical properties
Article number
1429_25
Pages
209 – 216
Language
English
Abstract
Peat-free propagation requires a modified approach compared to propagation in peat-based mixes, owing to the distinct physical and chemical characteristics of peat-free alternatives.
Understanding the varied properties of these alternatives is crucial, as the suitability of substrates for plant production is determined by unique physical, chemical and biological characteristics.
There is a significant gap in research on peat-free propagation media within the ornamental horticulture sector, with current knowledge and technical understanding still in their infancy compared to peat-based media.
In this study, seven different propagation mixes (six peat-free and one peat-based medium) were characterised for selected physical properties (dry matter, dry density) and chemical properties (pH, EC, N-NH4, N-NO3, TSN, P and K) to establish preliminary results and a baseline for further research.
The characterisation results demonstrated that each mix had unique physical and chemical properties.
Most importantly, greater consistency within each material was indicated by scatter plots and standard deviation (SD) values, validated through advanced statistical analysis using principal component analysis (PCA). The propagation materials tested had pH values ranging from 5.5 to 6.9 and EC values from 0.2 to 0.9. The N-NH4 levels ranged from 1.2 to 135.3 mg L‑1, while N-NO3 levels ranged from 38.2 to 263.1 mg L‑1. Phosphorus (P) levels ranged from 18.4 to 148.8 mg L‑1 and K levels ranged from 170.9 to 613.7 mg L‑1. Most values were within the optimum range specified for horticultural growing media based on literature, while some values fell outside this range.
This highlights the need for thorough characterisation of all bulk-constituting peat alternatives.
These variations in the properties of propagation materials necessitate different approaches for irrigation and nutrition management in commercial settings.
Understanding peat alternatives is crucial for a sustainable transition, providing valuable information for both the scientific and commercial sectors and facilitating the development of a comprehensive data library for peat-free propagation and growing media.
Understanding the varied properties of these alternatives is crucial, as the suitability of substrates for plant production is determined by unique physical, chemical and biological characteristics.
There is a significant gap in research on peat-free propagation media within the ornamental horticulture sector, with current knowledge and technical understanding still in their infancy compared to peat-based media.
In this study, seven different propagation mixes (six peat-free and one peat-based medium) were characterised for selected physical properties (dry matter, dry density) and chemical properties (pH, EC, N-NH4, N-NO3, TSN, P and K) to establish preliminary results and a baseline for further research.
The characterisation results demonstrated that each mix had unique physical and chemical properties.
Most importantly, greater consistency within each material was indicated by scatter plots and standard deviation (SD) values, validated through advanced statistical analysis using principal component analysis (PCA). The propagation materials tested had pH values ranging from 5.5 to 6.9 and EC values from 0.2 to 0.9. The N-NH4 levels ranged from 1.2 to 135.3 mg L‑1, while N-NO3 levels ranged from 38.2 to 263.1 mg L‑1. Phosphorus (P) levels ranged from 18.4 to 148.8 mg L‑1 and K levels ranged from 170.9 to 613.7 mg L‑1. Most values were within the optimum range specified for horticultural growing media based on literature, while some values fell outside this range.
This highlights the need for thorough characterisation of all bulk-constituting peat alternatives.
These variations in the properties of propagation materials necessitate different approaches for irrigation and nutrition management in commercial settings.
Understanding peat alternatives is crucial for a sustainable transition, providing valuable information for both the scientific and commercial sectors and facilitating the development of a comprehensive data library for peat-free propagation and growing media.
Authors
R. Prasad, M.B. Gush, A. Griffiths
Keywords
analytical techniques, characterisation, peat alternatives, peat-free, propagation
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