Kale cultivation management points

Fertilizer Management

Kale is a heavy feeder that requires consistent nutrients and moisture, making the choice of growing medium critical for success. A well-aerated, porous mix that retains water and nutrients is ideal. You can enhance the base mix by incorporating organic fertilizers like chicken manure, which provide slow-release nutrients. During the active growing season, it's recommended to use a balanced liquid fertilizer such as 20:10:20 at a concentration of 200 ppm, applying it every seven days to ensure steady growth and healthy development.

[Edit this paragraph] Sowing and Nursery Care

Kale can be grown hydroponically and is often used in anniversary plantings. However, it’s sensitive to cold temperatures, which may trigger premature flowering or even damage the plants. In northern regions, it’s common to grow kale in two cycles per year—once in February and another in August—to avoid the risk of frost and ensure optimal conditions for growth.

1. Seedling Preparation: The process of preparing kale seeds for sowing is similar to that of hydroponic lettuce. However, instead of using standard blocks, you’ll need to make a small cross-shaped cut in a 3cm square sponge block using a knife. This allows the seeds to be placed more securely within the sponge.

2. Seed Soaking: Before planting, soak the seeds in water for 8 to 24 hours. This helps to break dormancy and speeds up germination.

3. Seeding: Place two seeds into each cross-cut hole in the sponge block. Afterward, water the blocks thoroughly so that the water just covers the top surface of the sponge. This ensures good moisture contact with the seeds.

4. Germination and Thinning: Once the temperature is suitable, the seeds should germinate within 2 to 3 days. After about 10 days, when the seedlings are strong enough, remove all but one plant per sponge block to prevent overcrowding and promote healthy growth.

5. Nutrient Solution Application: After the seedlings have developed, drain the seedling tray and carefully control the water level. Then, apply a nutrient solution with an EC of 2.0 mS/cm, ensuring the solution reaches the same level as the top of the sponge. This provides the right balance of nutrients without over-saturating the roots.

This method ensures efficient and effective seedling production, setting the stage for robust kale growth in the main growing phase.

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