After the planting of vegetables in winter greenhouses, top dressing is mainly used, but top dressing is different from other seasons during this season.

The purpose of top dressing is different

In the spring and autumn, vegetables are in a vigorous growth stage. The purpose of top dressing is to further promote plant growth. In winter, most vegetables reach the mid-to-late growth stage. Due to the large amount of results, the nutrient consumption of plants is excessive, the growth is weak, and even premature aging occurs. In this case, the main purpose of top dressing is to enhance the plant growth, promote the expansion, and avoid roots. Aging, leaf senescence, premature aging.

The amount of fertilizer is different

With the advent of winter, the outside temperature gradually decreased, and the ground temperature in the shed decreased. For vegetables, the growth of the stems and leaves of vegetables decreased, the photosynthesis and transpiration decreased, the root activity weakened, and the ability to absorb water and fertilizer decreased. . This is obviously different from the Spring and Autumn Festival in which the temperature and the ground temperature are more suitable for the growth of vegetables. Therefore, when topdressing in the winter, it is necessary to change a lot of watering and fertilizing practices.

Fertilizer types are different

In spring and autumn, the temperature is high and the ground temperature is high. The impact of general compound fertilizers on vegetable roots is not obvious. In winter, because of the low temperature and ground temperature, the general compound fertilizer dissolved into the water will further reduce the water temperature. After flushing and irrigating, it will not only cause the ground temperature to drop, but also cause damage to the vegetable roots. Moreover, the compound fertilizer has low nutrient utilization rate. Therefore, For top dressing in winter, total water-soluble fertilizers and functional fertilizers should be used as top fertilizer for top dressing.

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