Winter fertilization of rapeseed, whether before or during winter, offers several benefits. First, it helps promote slow and steady growth of the crop during the cold season, which in turn improves its cold resistance. Second, applying fertilizer in winter and early spring supports the healthy development of the plants as they enter the growing season. Third, this practice can reduce the need for excessive spring fertilization, preventing the risk of overgrowth and lodging later in the season. Fourth, it makes good use of the natural moisture from winter rain and snow, avoiding the challenges of applying fertilizer during dry spring conditions. Lastly, top-dressing during the colder months increases fertilizer efficiency, leading to better nutrient uptake and lower overall production costs.
When applying fertilizer during winter, farmers typically use organic materials such as compost, manure, and other locally available warm-keeping fertilizers. Depending on the growth stage of the rapeseed, additional nitrogen sources like ammonium carbonate or ammonium chloride may be added to support plant development. After application, it is important to cultivate the soil and cover the fertilizer with a layer of earth to protect the seedlings from frost and prevent nutrient loss due to leaching or runoff. This careful approach ensures that the fertilizer remains effective and available for the plants when they resume active growth in the spring.
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