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 not the same 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. 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. Fertilizers are not the same 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, due to the low temperature and ground temperature, combined with the dissolution of general compound fertilizers into water, the water temperature will be further reduced. After flushing, not only will the ground temperature drop, causing damage to the roots of vegetables, but the nutrient utilization of compound fertilizers will be low. Roots have poor nutrition and even accumulate salt on the tillage layer, causing vegetables to cause root damage, yellow leaves, and yellow heads. Therefore, in the winter, topdressing should be changed in the spring and autumn seasons general fertilizer practice, the total water-soluble fertilizers and functional fertilizers as the main fertilizer fertilizer. Fish Tilapia,Tilapia Frozen Fish,Fresh Tilapia Fillet Ivp,Frozen Tilapia Exporter Zhoushan City Shuangying Aquatic Products Co., Ltd.  , https://www.shuangying-aquatic.com
The amount of fertilizer is not the same