1, Shizujifei: Longer growth period of winter spinach, in order to prevent defermenting, basal must be sufficient. Generally, all organic fertilizers, phosphorus and potash fertilizers can be applied in one go, and then soil preparation can be used. 2. Pre-winter nitrogen control: The fertilizer and water management standard before winter is to ensure that spinach grows 4 to 5 true leaves before winter and enhances the ability of spinach to resist cold. Too much or too small are susceptible to freezing injury. Therefore, if the sowing date is appropriate and the basal fertilizer is adequate, the amount of nitrogenous fertilizer should be appropriately controlled before going through the winter to prevent the seedlings from becoming leggy and suffer from freezing damage due to less accumulated dry matter. If the planting is too late or the soil is insufficient, consider applying nitrogen fertilizer in an appropriate amount. Promote the growth of seedlings and ensure that spinach will pass through the winter at the appropriate age. 3, return to green fertilizer: After the winter of spinach returns to green after the management of fertilizer and water, should seize the opportunity to timely fertilizer. The topdressing lot is applied along with the watering, and it is generally applied twice in the middle and late March and early April. Top dressing is too early and the ground temperature is low, affecting the slow seedling growth. If the top dressing is too late, the fertility will be insufficient and it will delay the growth of spinach. In short, top dressing after winter, must be carried out before the spinach convulsions, so that the spinach can cause delayed flowering, which will help improve the yield and quality of spinach. 4. Use ammonia nitrogen fertilizer with caution. Spinach is sensitive to ammonia nitrogen. The growing season of overwintering spinach coincides with autumn and winter and winter and spring. Soil temperature is low, and soil nitrification is weak. Therefore, it is best to use caution or not.
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