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Current canola to do "five defenses"
Due to continuous drought in early November this year and the lack of base fertilizer, a higher proportion of second- and third-class seedlings have been observed. This has led to premature aging and poor growth conditions. To address this, it is essential to take advantage of favorable weather conditions by applying 10–15 liters of human and animal manure water per mu as a wax fertilizer. For weak rape seedlings, a certain amount of available nitrogen fertilizer should be applied. However, farmyard manure should not be used for potassium supplementation; instead, 5–6 kilograms of potassium fertilizer per mu should be added.
Winter survival is critical for the health of the plants. For fields with dense seedlings, apply 50 grams of paclobutrazol per mu mixed with 70 kilograms of water to regulate growth and prevent lodging.
To avoid early bolting and premature wilting, rapeseed should be harvested promptly during good weather. After harvesting, remove one-third of the main stem and apply 3–5 kilograms of urea per mu to promote healthy regrowth.
In preparation for cold and frost events, several protective measures should be taken. Before extreme low temperatures occur, smoke fumigation can be used to provide warmth. If frost is expected, sprinkle a layer of turfgrass on the leaves to reduce damage. Additionally, chemical antifreeze treatments such as "Guard Green King" can be sprayed at a rate of one packet per mu. Another effective method is foliar application of boron-based antifreeze, using 1–2 packages of "Five Increase Card" leaf boron fertilizer per mu.
To prevent soil contamination and disease outbreaks, it's important to clean up the "three ditches" (drainage ditches) before the rainy season ends. This ensures proper drainage and prevents waterlogging, which can lead to root rot and Sclerotinia sclerotiorum infection in the spring.
By implementing these timely and targeted measures, farmers can significantly improve the health and yield of their rapeseed crops.