Pay attention to potash fertilizer. The increase of potassium fertilizer in basal fertilizer and top dressing is beneficial to the cabbage's core and disease resistance. The application of potash fertilizer should be emphasized in the top-dressing topdressing, and if the supply of potassium is insufficient during the cabbage period, the cabbage will not be added. At present, potassium fertilizer is often neglected in vegetable production. The appropriate amount of potassium is generally 16 kg of potassium sulfate per acre. The best method of application is to divide the basal and top dressings in two applications: the basal fertilizer is applied to the bottom of the burrows during the colonization, and the top dressing is performed after the seedlings are terminated in the rosette stage, combined with topdressing nitrogen fertilizer and irrigation.
Appropriate amount of nitrogen fertilizer. Applying a proper amount of nitrogen fertilizer is beneficial to photosynthesis, which is the key to achieving high quality and high yield of Chinese cabbage. At present, the application of nitrogen fertilizer in cabbage production areas far exceeds the demand, while excessive application of nitrogen fertilizer not only leaves the outer leaves of the cabbage thick, poor package quality, low yield and quality, but also has large water content in the leaves and is not resistant to storage after harvest. In addition to the appropriate amount, nitrogen fertilizer use period is also very important. In the whole growth period of Chinese cabbage, the amount of nitrogen absorption at different stages is also different. The seedling period is small, accounting for about 2% of the total, and the rosette period is increased to 28%. The nitrogen uptake during the filling period is the highest, accounting for about 70% of the total. Therefore, the application of nitrogen fertilizer to be applied in stages, reflecting the former light and heavy. Ensure calcium supply. Through the application of calcium superphosphate or foliar spray of 0.3%-0.5% calcium chloride solution to supplement calcium nutrition, it can prevent the occurrence of Chinese cabbage "dry heart-burning" disease.
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