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We examined the efficacy of coir dust (CD)—the short fibers and dust from the mesocarp of coconuts ( Cocos nucifera  L.)—as an alternative to sphagnum peat (SP) in 50 SP : 50 vermiculite (% volume) medium. Shoot dry mass of coreopsis ( Coreopsis lanceolata  L.) or `Red Robin' tomato ( Lycopersicon esculentum  Mill.) after 5 weeks' growth in up to 50 CD : 50 vermiculite (% volume) was similar to that in 50 SP : 50 vermiculite and a commercial peat-lite (Pro-Mix BX). These growth responses depended on preplant controlled-release fertilizer (CRF) [Osmocote 17N-3.9P-10.8K at 11.5 lb/yd 3  (4 kg·m −3 )] and/or a post-transplanting weekly solution fertilization (SF) at 350 ppm (mg·L −1 ) N from 21N-2.2P-16.6K. Compared to SP, CD had lower bulk density and cation exchange capacity (volume basis) and higher C to N ratio, pH, total porosity, and container capacity. We conclude that CD is an adequate alternative to SP in soilless container media.

Growth of Tomato and Coreopsis in Response to Coir Dust in Soilless Media