First, the amount of topdressing is different from the outside temperature in winter, and the ground temperature in the shed is also reduced. For vegetables, the growth of the stems and leaves of vegetables is reduced, the photosynthesis and transpiration are reduced, the root activity is weakened, and water absorption and absorption are reduced. Decrease in ability. 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.
The second is that the top-dressing fertilizers have different temperatures in spring and autumn, and the ground temperature is also high. The impact of general compound fertilizers on vegetable roots is not obvious. In winter, due to the low temperature and ground temperature, the general compound fertilizer dissolved into water will further reduce the water temperature. Therefore, in the winter, topdressing should be changed in the spring and autumn seasons. The total fertilizer and functional fertilizers can be used as the main fertilizer for topdressing.
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