1、 Base fertilizer

To apply base fertilizer to watercress green, you should mix rotten organic fertilizer, such as chicken manure, stable manure, or slow-release chemical fertilizer of all elements into the soil during the process of adding or changing pots

2、 Topdressing

In the growing season, usually in spring and autumn, we need to topdressing fertilizer for Douban green. Rotten organic fertilizer and liquid fertilizer can be applied. For example, rotten bean cake water or slow-release granular fertilizer can be used. The amount of fertilizer should not be too large to avoid fertilizer damage and endanger the normal growth of plants. The frequency of fertilization should not be too frequent. In the growth period, these two kinds of fertilization methods are mainly used, and there are no strict requirements for fertilizers