Kenaf Core as an Alternative Soilless Growing Medium: A Review

Area of Science:

• Agricultural Science
• Horticulture
• Sustainable Materials

Background:

• Kenaf (Hibiscus cannabinus) core is a renewable byproduct rich in cellulose and hemicellulose.
• It is being explored as a sustainable alternative to peat and coco coir in soilless cultivation.
• Understanding its performance characteristics is crucial for its adoption.

Purpose of the Study:

• To review and synthesize the physical, chemical, and biological performance of ground kenaf core.
• To benchmark kenaf core against conventional soilless substrates like peat and coco coir.
• To identify processing variables and data gaps for optimizing kenaf core utilization.

Main Methods:

• Literature review synthesizing existing studies on kenaf core properties and plant growth.
• Benchmarking kenaf core's physical (bulk density, porosity, water availability) and chemical (pH, EC) properties against standards.
• Analysis of growth study results comparing kenaf blends with conventional substrates.

Main Results:

• Kenaf core has favorable physical properties (low bulk density, high porosity, good water availability) but variable electrical conductivity (EC).
• Blends with 20-70% kenaf core show comparable plant performance to conventional substrates, with composted kenaf often superior.
• Pure kenaf or high proportions may require adjustments in irrigation and can cause shrinkage; crop-specific suitability is noted.

Conclusions:

• Pre-leached kenaf core, blended up to 70% with stable components like perlite, can successfully support ornamental and bedding crops.
• Kenaf core's suitability is crop-dependent and influenced by processing methods (purity, particle size, composting, leaching).
• Further research is needed on standardized testing and long-term performance to optimize its use in sustainable horticulture.