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Tung husk and carbonized rice husk mixes as substrates for Dendranthema morifolium Tzevelev ‘golden polaris’ rooting under plastic coverage.

The Chinese tung tree (Aleurites fordii Hemsl) is cultivated on small farms in the State of Rio Grande do Sul, Brazil, for the tung oil industry. Tung oil, also known as wood oil, is used mainly as an ingredient for paints and varnishes. Tung husk (CT) are a by-products of this industrial process. The high content of long-lasting fibers suggests that CT could be appropriate to be mixed in substrates for potted plants. CT shows high water retention in micropores and, to correct this characteristic, should be mixed to materials with good drainage. The present study was conducted to evaluate CT and carbonized rice husk (CAC) mixes as substrates for chrysanthemum rooting under plastic coverage. Five blends were evaluated: 1CT, 3CT:1CAC, 1CT:1CAC, 1CT:3CAC and 1CAC, plus CACV (CAC: superfine vermiculite 6:1 v:v) as a reference material. To characterize these mixes, salinity, pH, bulk density and water retention curves were measured. Both CAC and CACV showed similar efficiency as a rooting media, with excellent results for this species. Chrysanthemums rooted in the presence of CT showed a different morphological development, with more numerous and darker roots but shorter in length, indicating the presence of composts that interfered on the rizogenesis. These differences cannot be considered as negative. Within the blends containing tung husks, 1CT:3CAC, followed by 1CT showed the best results. This was related to their higher easy available water content.

ISSN: 2447-536X

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