Can fish protein fertilizer be used on radishes and Chinese cabbage?

Fish protein fertilizer is highly suitable for use on radishes and Chinese cabbage; it effectively promotes crop growth while enhancing quality and yield.

As a high-quality organic water-soluble fertilizer, it is rich in amino acids, small-molecule peptides, and various secondary and trace elements. It is easily absorbed by crops, making it particularly well-suited to the growth requirements of leafy greens and root vegetables.

Application Methods and Timing
For radishes and Chinese cabbage, it is recommended to apply the fertilizer via root irrigation or foliar spraying after dilution. For basal application, 150–200 kg of fully decomposed fish protein organic fertilizer can be applied per mu before soil preparation. For top-dressing, dilute the liquid fish protein fertilizer 300–500 times (e.g., mix 1 kg of concentrate with 300–500 kg of water). Apply via root irrigation during the early stage of radish root enlargement or the rosette stage of Chinese cabbage, using approximately 200–300 kg of the diluted solution per mu. For foliar spraying, dilute the product 800–1,000 times and spray evenly during critical growth periods, repeating every 10–15 days.

Actual Effects
Fish protein fertilizer significantly promotes leaf thickening and deep green coloration in Chinese cabbage, while enhancing cold resistance. For radishes, it aids root development, resulting in more uniform root shapes and smooth skin, while effectively reducing issues such as root cracking and pithiness (hollow core). The organic matter and active substances it contains also improve soil aggregate structure, enhancing soil fertility with long-term use.

Precautions
While fish protein fertilizer is beneficial, it cannot entirely replace traditional chemical fertilizers. It is best used as a nutritional supplement in conjunction with chemical fertilizers. For instance, using fish protein fertilizer to provide amino acids and trace elements-while maintaining a baseline supply of nitrogen, phosphorus, and potassium-creates a synergistic effect. When purchasing, select legitimate products that meet national standards; avoid using homemade fish protein fertilizer that has not been thoroughly decomposed, as this can cause root burn or introduce pathogens.