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Improving growth of stockplants and rooting ability of leafy stem cuttings of Allanblackia floribunda Oliver (Clusiaceae) using different NPK fertilizers and periods of application
- Tsobeng, Alain, Ofori, Daniel, Tchoundjeu, Zacharie, Asaah, Ebenezer, Van Damme, Patrick
- New forests 2016 v.47 no.2 pp. 179-194
- Clusiaceae, NPK fertilizers, callus, cutting, fertilizer application, rooting, roots
- Our study addressed the effect of granular NPK 20-10-10 doses (0, 25 and 50 g/plant) applied to A. floribunda stockplants on growth of stockplant and the effect on rooting ability of foliar NPKs (15-15-30, 20-20-20 and 30-10-10) applied on leafy stem cuttings in propagators at different physiological stages of rooting process (setting, callus initiation and both). Results show that fertilizer doses significantly (p = 0.03) affect the number of cuttings that could be produced by stockplants 6 months after application. The mean number of cuttings per plant increased with fertilizer doses with the highest value of 11.06 ± 0.41 % for 50 g. Application of NPK 20-20-20 foliar fertilizer on stem cuttings at callus stage, significantly (p = 0.04) boosted rooting of stem cuttings after 28 weeks (85.71 ± 4.1 %). Number of roots per cutting was not significantly different (p = 0.98). However, the highest frequency of cuttings displayed three roots was observed on NPK 20-20-20 (To + Cal) and NPK 30-10-10 (To + Cal). From this study, we can conclude that, 50 g of NPK 20-10-10 fertilizer application on stockplants produced the greatest number of vegetal material. Treated with NPK 20-20-20 at callus initiation stage or both (i.e. at setting and at callus initiation stage), rooting performs better.