Fertilizer Management
Kale is a nutrient-demanding plant that requires both proper water and fertilizer to thrive. Choosing the right growing medium is crucial for its healthy development. A well-balanced mix that is loose, breathable, and capable of retaining moisture and nutrients is ideal. Organic fertilizers such as chicken manure can be incorporated into the medium as a base fertilizer to provide slow-release nutrients. During the active growing season, a liquid fertilizer with a ratio of 20:10:20 is commonly used at a concentration of 200 ppm. This should be applied once every seven days to ensure consistent growth and optimal health.
[Edit this paragraph] Sowing and Nursery Care
Kale can be grown hydroponically and is often used in anniversary plantings. However, it is sensitive to low temperatures, which can lead to stress, stunted growth, or premature flowering. In northern regions, where temperature fluctuations are more extreme, it's common to grow kale in two cycles per year—once in February and another in August. This helps avoid the risk of cold damage and ensures a steady supply of fresh leaves.
1. Preparation Before Sowing: The process of preparing seeds for kale is similar to that of hydroponic lettuce. However, a small 3cm square sponge block is used, and a cross-shaped cut is made using a knife. The cut should be about 1cm wide and 1cm deep to create a planting pocket for the seeds.
2. Seed Soaking: Before sowing, soak the seeds in water for 8 to 24 hours. This helps soften the seed coat and promotes faster germination.
3. Seeding: Place two seeds into each cross-cut hole on the sponge block. After sowing, add enough water to the tray so that the surface of the sponge is just covered. This ensures good moisture contact and supports early root development.
4. Germination and Thinning: Under suitable temperature conditions, the seeds will typically germinate within 2 to 3 days. Once the seedlings have developed, they should be transplanted after about 10 days. At this stage, only one strong seedling should remain on each sponge block, while the others are removed to prevent overcrowding and competition for resources.
5. Nutrient Solution Application: After the seedlings are established, the nutrient solution is introduced. First, drain the seedling tray to allow the sponges to absorb the solution properly. Then, apply a nutrient solution with an EC of 1.8–2.0 mS/cm, ensuring that the solution level in the tray matches the top surface of the sponge blocks. This method provides a balanced supply of essential minerals and supports healthy root development during the early stages of growth.
This detailed approach ensures that kale grows vigorously and efficiently, especially when using hydroponic techniques. By following these steps, growers can achieve consistent yields and high-quality produce throughout the growing season.
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