Appropriate control of nitrogen fertilizer before wintering. The standard of fertilizer and water management before wintering spinach is to ensure that spinach grows 4 to 5 true leaves before wintering. Because 4 to 5 true leaves of spinach have the strongest cold resistance, too large or too small are susceptible to freezing damage. Therefore, if the sowing date is appropriate, the fertilizer is sufficient, and the application of nitrogen fertilizer should be properly controlled before wintering to prevent the growth of the seedlings, the accumulation of dry matter and sugar, and the freezing damage. If the planting is too late or the soil is insufficient, consider applying nitrogen fertilizer to promote the growth of the seedlings to ensure that the spinach will survive the appropriate seedling age. Apply enough base fertilizer. The wintering spinach has a longer growth period. In order to prevent defatting, the base fertilizer must be applied. Generally, the organic fertilizer and all the phosphorus and potassium fertilizers to be applied are applied as a base fertilizer, and then the soil is used as a base. Strengthen the management of fertilizer and water after returning to green. The key to the management of spinach fertilizer after wintering is to seize the opportunity of topdressing. Spinach top dressing is carried out with irrigation. After returning to green, the topdressing will lower the soil temperature, affecting the slow seedling and growth, and the late dressing will delay the growth of spinach. Wintering spinach is generally suitable for two times in the middle and late March and early April, because the outside temperature and soil temperature are steadily increasing. After wintering, the top dressing must be carried out before the spinach is twitched and flowered. Because topdressing at this time can prolong the time of spinach twitching and flowering, which is conducive to increasing the yield and quality of spinach. Use ammonium nitrogen fertilizer with caution. Spinach is sensitive to ammonium nitrogen fertilizer. The production season of wintering spinach is at the junction of autumn and winter and winter and spring. At this time, the soil temperature is low and the soil digestion is weak. Therefore, it is best to use less ammonium nitrogen fertilizer and appropriate use of nitrate nitrogen fertilizer.
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