1. Base fertilizer is applied using high-quality farmyard manure at a rate of twice per acre. 2. For yields above 6500 kg/mu, the recommended application rates are nitrogen (N) at 18–20 kg/mu, phosphate (P₂O₅) at 8–10 kg/mu, and potash (K₂O) at 14–16 kg/mu. 3. For yields between 5500–6500 kg/mu, the nitrogen should be 15–18 kg/mu, phosphate 6–8 kg/mu, and potash 12–14 kg/mu. 4. For lower yields of 4500–5500 kg/mu, the nitrogen requirement drops to 13–15 kg/mu, phosphate to 4–6 kg/mu, and potash to 8–10 kg/mu.
For plots that have experienced severe dry heartburn in previous seasons, it's important to supplement with nitrogen and calcium. A solution of 0.3%–0.5% calcium chloride (CaCl₂) should be sprayed 2–3 times, starting from the rosette stage up to the late stage of head formation. If the soil pH in the vegetable garden is below 5, apply 100–150 kg of quicklime per acre. If the pH is less than 4.5, increase the lime application to 150–200 kg per acre. In boron-deficient areas, consider applying 0.5–1 kg of borax per mu, or spray 0.2%–0.3% borax solution 2–3 times. At the same time, spraying 0.5% potassium dihydrogen phosphate 2–3 times can help improve yield and marketability of cabbage.
It's also recommended to apply 30%–40% of the nitrogen and potassium as base fertilizer, with the remaining 60%–70% applied during the rosette stage and the early phase of head formation. Phosphate fertilizer should be applied as a base fertilizer or directly into the planting holes. These practices help ensure balanced nutrition for the plants throughout their growth cycle, leading to better quality and higher productivity.
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