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Before winter, the nitrogen-controlled spinach must ensure that 4 to 6 true leaves are grown before winter, which is beneficial to enhance the cold resistance. If it is too large or too small, it is vulnerable to freezing damage. The spinach should be controlled before the winter, to prevent the seedlings from being exposed to freezing damage. If the seeds are too late or have insufficient ground strength, the nitrogen fertilizer can be applied in an appropriate amount to promote the growth of the seedlings and ensure that the spinach is overwintered at a suitable seedling age.
Rejuvenation and wintering of spinach should be carried out before the flowering of spinach, delaying the convulsion and flowering of spinach, and increasing the yield and quality of spinach.
Careful use of ammonia nitrogen fertilizer spinach is sensitive to ammonia nitrogen fertilizer. The growing season of wintering spinach is alternating in autumn, winter and spring, the ground temperature is low, and the soil digestion is weak. It is best to use caution or not ammonia nitrogen fertilizer.
The long-term winter spinach has a longer growth period. In order to prevent de-fertilization, the base fertilizer must be sufficient. Generally, the organic fertilizer and the phosphorus and potassium fertilizers can be applied in one layer at a time, and then the soil is smashed.
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