1. Base fertilizer

Base fertilizer refers to clamping the fertilizer in the basin soil in the process of changing the basin soil. The fertilizer used can be slow acting compound fertilizer or rotten organic fertilizer. The fertilizer is mainly soil improvement and slow supply of nutrients. Rotten bone powder and some slow-release compound fertilizer can be mixed into the basin soil

The base fertilizer used should not be in contact with the root system of Rhododendron, that is, after the fertilizer is added, a layer of soil should be padded, and then Rhododendron should be planted to avoid fertilizer damage

2. Topdressing

Topdressing is the fertilizer applied during the growth period of Rhododendron. The general use time is after flowering, before new buds and the time of flower bud differentiation. When it has finished flowering, it can be fertilized in time to promote its germination of new buds and enter a new growth period

When topdressing, quick acting fertilizer should be used. The fertilizer can be relatively single, and the fertilizer effect is based on fast. In the cool autumn season, it is necessary to apply phosphorus and potassium fertilizer and control the application of nitrogen fertilizer to promote the differentiation of flower buds

3. Fertilization principle

Rhododendron fertilization requires thin fertilizer and frequent application. The concentration of fertilizer cannot be too large. We can add one tenth of fertilizer to the water every time we water