Appropriate control of nitrogen fertilizer before winter. The management criteria of wintering spinach before wintering 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, they are susceptible to freezing injury when they are too large or too small. Therefore, if the sowing date is appropriate and the manure is sufficient, the application of nitrogen fertilizer should be properly controlled before the winter to prevent the seedlings from being leggy, and the accumulation of dry matter and sugars will be reduced and they will be subject to freezing injury. If sowing is too late or there is not enough land, you may consider applying nitrogen fertilizer to promote the growth of the seedlings to ensure that the spinach will be overwintering at an appropriate age.
Apply base fertilizer. The overwintering spinach has a long growing period. In order to prevent deferment, the basal fertilizer must be applied. In general, organic fertilizers and all phosphorus and potassium fertilizers that should be applied are used as base fertilizers in full layers, and then soil preparation is performed.
After returning green, we will strengthen fertilizer and water management. The key to managing spinach fertilizer after wintering is to seize the opportunity to topdressing. The topdressing of spinach is carried out with irrigation water. If the top dressing is applied after returning green, the temperature of the soil will be lowered prematurely, affecting the slow seedling growth and growth, and the top dressing will delay the growth of spinach. Overwintering spinach is generally suitable for two times in March and late April and early April, because the outside temperature and soil temperature are steadily increasing.
After winter, topdressing must be done before the spinach convulsions bloom. Because topdressing at this time, can extend the time of spinach bolting flowering, is conducive to improving the yield and quality of spinach.
Use ammonium nitrogen with caution. Spinach is sensitive to ammonium nitrogen fertilizer. The production season of overwintering 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 better to use less ammonium nitrogen fertilizer and to use more nitrate nitrogen fertilizer.
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