How to Fertilize golden yellow-flowered dendrobium?
Half-strength orchid feed every few weeks in growth

golden yellow-flowered dendrobium · Dendrobium chrysanthum
Plants are best grown in a basket, in an epiphytic, medium grade, bark-based potting mix with added perlite, moss, or coir. As with many orchids, they grow best when the roots are slightly restricted. Therefore, avoid over-potting or frequent root disturbance. Provide bright, filtered light throughout the year. Plant requires frequent watering and relatively high humidity during summer months and a period of rest in winter - reduce watering and feeding in autumn, until warmer temperatures initiate flowering and new growth in spring. See indoor orchid cultivation
Half-strength orchid feed every few weeks in growth