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Proper fertilization of raspberries in late autumn is crucial for winter survival and future yields. Focus on phosphorus and potassium-based fertilizers to strengthen root systems and enhance cold resistance. Recommended fertilizers include superphosphate and potassium sulfate, applied in specific amounts to avoid damaging shallow roots. Organic matter like compost and well-decomposed humus also plays a vital role in soil structure and moisture retention. A mulch layer can protect roots from temperature fluctuations. Avoid nitrogen-rich fertilizers during this period to ensure healthy growth in spring.