Recycling crushed pottery as a growing media for Angelonia angustifolia Benth. in Binh Duong
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Abstract
The objective of this study was to evaluate the effects of different crushed pottery rates on the growth and flowering performance of Angelonia angustifolia Benth. A single-factor experiment was arranged in a completely randomized design (CRD) comprising five treatments: G1 (Control): 40% coconut coir + 40% rice husk ash + 20% vermicompost; G2: 80% control substrate + 20% crushed pottery; G3: 60% control substrate + 40% crushed pottery; G4: 40% control substrate + 60% crushed pottery; and G5: 20% control substrate + 80% crushed pottery. Each treatment was replicated three times, with 10 pots per replicate and one plant per pot, totaling 150 plants in the experiment. The results indicated that the air-filled porosity of the substrate increased with higher proportions of crushed pottery, whereas the water-holding capacity decreased. Specifically, when 80% crushed pottery was added to the control substrate mixture, the air-filled porosity increased from 11.8% to 23.6%, while the water-holding capacity decreased from 50.74 to 18.65%. Monitoring the growth and flowering parameters of Angelonia angustifolia revealed that the substrate containing 40% crushed pottery combined with 60% of the control mixture (coconut coir, rice husk ash, and vermicompost in a 2:2:1 ratio) resulted in the best performance. Plants grown in this treatment achieved the highest values for plant height (36.9 cm), number of primary branches (15.1 branches/plant), flower spike length (25.5 cm), fresh floral biomass (15 g), dry floral biomass (8.3 g), time to bud initiation (18.6 days), and flower longevity (14.3 days).
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