Kenaf ( Hibiscus cannabinus L.) core as a containerized growth medium component

Abstract

Kenaf ( Hibiscus cannabinus L.) stems contain two distinct fiber types, bast and core. The absorbent, low density core (xylem) is a possible potting mix component. Two greenhouse studies were conducted during 1993 and 1995 to determine the feasibility of substituting kenaf core for vermiculite and bark. In Study 1, fine-grade kenaf was substituted for vermiculite in three volume ratios (1, 2 or 3) with sphagnum peat moss and perlite (1:1) and compared to a 1:1:1 ratio of vermiculite:sphagnum peat moss:perlite. In Study 2, coarse-grade kenaf was substituted in three volume ratios (1, 2 or 3) with sphagnum peat moss and compared to a 1:1 ratio of pine bark:sphagnum peat moss. Plant height, canopy diameter, shoot weight, and root weight of periwinkle ( Vinca minor) seedlings were determined 10 weeks after transplanting into the media contained in 12.5-cm diameter pots. The substitution of fine-grade kenaf for vermiculite at a 1:1 ratio reduced to some extent all periwinkle yield parameters except root dry weight. As the volume of fine-grade kenaf increased, all yield parameters decreased compared to the vermiculite media. Substitution of coarse-grade kenaf for pine bark in a 1:1 ratio produced equivalent or greater yield components. This research indicates that kenaf core can be a suitable containerized growth medium component, depending on the size and percentage of kenaf used, the plant growth requirements, and the specific physical characteristics desired in the containerized growth media.